工业工程最新文献

{"title":"[Contribution of Microbial Necromass Carbon to Soil Organic Carbon Fractions and Its Influencing Factors in Different Soil Layers of Typical Forest Land and Grassland in the Loess Plateau， China].","authors":"Dong-Rui Qin, Yi-Mei Huang, Qian Huang, Feng-Jing Xu, Ji-Kai Shen","doi":"10.13227/j.hjkx.202408038","DOIUrl":"https://doi.org/10.13227/j.hjkx.202408038","url":null,"abstract":"<p><p>Microbial necromass carbon（MNC） is a significant source of soil organic carbon（SOC）. However， the contributions of microbial necromass to different organic carbon fractions and their influencing factors in various soil layers under different land use types remain unclear. In this study， typical soil samples from 0-20， 20-40， 40-70， and 70-100 cm soil layers were collected from representative forest land and grassland sites in the Loess Plateau. The contents of SOC， mineral-associated organic carbon（MAOC）， and particulate organic carbon（POC） were measured. Furthermore， the MNC， fungal necromass carbon（FNC）， and bacterial necromass carbon（BNC） contents and their contributions to POC and MAOC fractions in each soil layer were determined， and their influencing factors were analyzed. The results follow： ① In the 1 m soil profile， <i>ω</i>（MAOC） and <i>ω</i>（POC） ranged from 2.54 to 11.09 g·kg<sup>-1</sup> and 0.19 to 3.06 g·kg<sup>-1</sup> in grassland and from 3.02 to 8.78 g·kg<sup>-1</sup> and 0.30 to 2.45 g·kg<sup>-1</sup> in forest land， respectively. The SOC content in the 0-20 cm layer was 2.53 and 2.35 times higher than the content in the 20-40 cm layer for grassland and forest land， respectively， while the MAOC content was 2.10 and 2.12 times higher， respectively. The POC content in the 0-20 cm layer of grassland was 81.7%， 42.86%， and 40.63% higher than that in the subsequent three layers， but in forest land， POC content decreased by 77.14% in only the 20-40 cm layer. The contents of SOC， MAOC， and POC in the 0-20 cm layer of grassland were 1.31， 1.26， and 1.25 times those in forest land， respectively. In the 70-100 cm layer， the contents of MAOC and POC in forest land were 1.19 and 1.58 times those in grassland， respectively. ② The <i>ω</i>（MNC） ranged from 0.65 to 5.85 mg·g<sup>-1</sup> in grassland and from 0.80 to 6.42 mg·g<sup>-1</sup> in forest land. The <i>ω</i>（FNC） and <i>ω</i>（BNC） ranged from 0.09 to 4.49 mg·g<sup>-1</sup> and 0.03 to 0.58 mg·g<sup>-1</sup> in grassland and from 0.02 to 4.61 mg·g<sup>-1</sup> and 0.04 to 0.39 mg·g<sup>-1</sup> in forest land， respectively. FNC dominated the POC and MAOC fractions， with <i>ω</i>（FNC）/<i>ω</i>（MAOC） in the 0-20 cm layer being 1.48 and 17.33 times that of the 20-40 cm layer in grassland and forest land， respectively. In the 20-100 cm layer， <i>ω</i>（FNC）/<i>ω</i>（MAOC） in grassland was 12.7 times that in forest land. The <i>ω</i>（BNC）/<i>ω</i>（POC） in the 70-100 cm layer was 2.25 and 16.75 times higher than in the 0-20 cm layer for grassland and forest land， respectively. In the 1 m profile， <i>ω</i>（FNC）/<i>ω</i>（POC） in forest land was 5.95 times that in grassland. ③ Random forest modeling indicated relative importances of AGB， BGB， TN， NO<sub>3</sub><sup>-</sup>-N， SOC， and DOC for MNC accumulation in the 0-20 cm layer of grassland and forest land， whereas BGB， SOC， DOC， TN， MBC， MBN， NO<sub>3</sub><sup>-</sup>-N， NH<sub>4</sub>?-N， and Clay+Silt were more critical in the 20-","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5705-5717"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145082034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Changes in Carbon Storage and Multi-Scenario Prediction in the Beijing-Tianjin Sandstorm Source Region Using a Coupled PLUS-InVEST Model].","authors":"Yan Huang, Xiao-Man Liu, Bing-Bing Gao, Peng Hou, Hai-Li Zhou","doi":"10.13227/j.hjkx.202408114","DOIUrl":"https://doi.org/10.13227/j.hjkx.202408114","url":null,"abstract":"<p><p>Quantitative assessment and prediction of the impacts of regional land use changes on ecosystem carbon storage have profound practical significance for achieving sustainable regional development. Focusing on the Beijing-Tianjin Sandstorm Source Region （BTRSSR）， a key target area of the Grain for Green Program， this study leveraged land use data extending from 2000 to 2020. We first analyzed the spatiotemporal patterns of land use changes within this period. Subsequently， the InVEST model was employed to discern the spatiotemporal distribution and dynamics of carbon storage. Furthermore， the Markov-PLUS model was applied to forecast the land use patterns and corresponding changes in carbon storage for the year 2040 under the three scenarios of natural development， urban development， and ecological conservation. The key findings are as follows： ① Land Use Dynamics （2000-2020）： The BTRSSR showed an expansion of forestland， grassland， shrubland， and construction land， accompanied by a contraction in water bodies， cultivated land， and unused land. Notably， cultivated land primarily transitioned to grassland， forestland， and construction land， while unused land primarily converted to grassland. ② Carbon Storage Trends （2000-2020）： Overall， the region's carbon storage exhibited an upward trend， with a total increase of 7.92 Tg. Spatially， a gradual decrease in carbon storage was observed from southeast to northwest. The augmentation of forestland and grassland emerged as the primary driver behind this increase in regional carbon storage. ③ Future Projections （2040）： With the exception of the urban development scenario， both the natural development and ecological conservation scenarios project further increases in future carbon storage in the BTRSSR. Notably， under the ecological conservation scenario， the projected total carbon storage reaches 4 243.65 Tg， surpassing that of the natural development scenario by 8.04 Tg. This underscores the assertion that the Grain for Green Program effectively enhances ecosystem carbon storage， with the ecological conservation scenario identified as the optimal development pathway for the study area. These findings highlight the critical role of land use management policies， particularly those promoting ecological restoration， in enhancing regional carbon sequestration and fostering sustainable development.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5741-5751"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Dynamic Evolution and Influencing Factors of Urban Land Green Use Efficiency in the Yangtze River Delta from the Perspective of \"Pollution Reduction and Carbon Reduction\"].","authors":"Yan Sun, Li-Li Wu, Yun-Peng Zhang, Ye-Ting Fan, Guo-Qiang Ma, Hong-Tao Liang","doi":"10.13227/j.hjkx.202407077","DOIUrl":"https://doi.org/10.13227/j.hjkx.202407077","url":null,"abstract":"<p><p>Scientific exploration of the spatiotemporal characteristics and influencing factors of urban land green use efficiency from the perspective of \"pollution reduction and carbon reduction\" has great significance for achieving sustainable regional resource utilization. Taking the Yangtze River Delta Region as an example and using the period from 2003 to 2022 as the study period， this paper incorporates environmental indicators into a super-efficiency SBM model with \"desirable output + undesirable output\" to measure the urban land green use efficiency in the region. By employing methods such as kernel density estimation， Theil-Sen trend analysis， and panel fixed effects models， this study comprehensively analyzes the spatiotemporal evolution characteristics and influencing factors of urban land green use efficiency in the Yangtze River Delta. The study yields several important results： ① Over the study period， the urban land green use efficiency in the Yangtze River Delta Region shows an overall upward trend， with regional disparities exhibiting a divergent pattern. ② The urban land green use efficiency in the Yangtze River Delta Region generally presents a spatial pattern of higher efficiency in the east and lower efficiency in the west， with significant increases in efficiency in most cities during the study period. ③ The expansion of urban economic scale， industrial structure upgrading， and technological advancement significantly promote green efficiency of land use. Based on these findings， this paper suggests strengthening regional coordinated development， enhancing urban economic scale， upgrading industrial structure， and improving the technological level to improve urban land green use efficiency. The conclusions of this study provide theoretical references for the formulation and adjustment of regional development policies and the green and high-quality development of regional economies.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5577-5586"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Spatiotemporal Evolution of Carbon Emission from Land Use and Its Driving Factors at the County in Beijing-Tianjin-Hebei].","authors":"An-Jia Li, Xu Yin, Hui Wei","doi":"10.13227/j.hjkx.202407213","DOIUrl":"https://doi.org/10.13227/j.hjkx.202407213","url":null,"abstract":"<p><p>Carbon emissions triggered by land use changes have become the main source of regional carbon emissions. Taking Beijing-Tianjin-Hebei， where land use changes are extreme and the intensity of carbon emissions far exceeds the national average， as the study area and taking the county as the study unit， we systematically investigated the spatial and temporal evolution of regional land use carbon emissions and its driving factors， which has great significance in guiding the optimization and adjustment of the low-carbon land use in Beijing-Tianjin-Hebei and the realization of the goal of the \"dual-carbon\" strategy. This study integrated data from multiple sources， including land use， nighttime lighting， and socioeconomic data， and also integrated the carbon emission coefficient method， nighttime lighting inversion， improved Kaya model， and LMDI model to study the characteristics of the spatial and temporal evolution of carbon emissions from land use in Beijing-Tianjin-Hebei counties and identify the driving factors in the period of 2000?2020. The study produced several results： ① From 2000 to 2020， land use in Beijing-Tianjin-Hebei was mainly characterized by a dramatic conversion of construction land and cropland， with construction land as the main carbon source and forest land as the main carbon sink. ② During the study period， the net carbon emission from land use in Beijing-Tianjin-Hebei increased from 71.857 9 million t to 159.698 5 million t， with a change rate of 122.24%. Carbon emissions in Caofeidian District， Fuping County， and Luanping County increased by a higher amount， whereas carbon emissions in Dongcheng， Xicheng， and Chaoyang Districts of Beijing decreased. ③ The economic contribution coefficient of carbon emissions from land use in Beijing-Tianjin-Hebei showed a decreasing trend in general， while the spatial pattern of ecological carrying coefficients was more stable， with high ecological carrying coefficient （&gt;1） counties concentrated in the northwestern ecological conservation area and other districts and counties consistently having lower ecological carrying coefficients. ④ The level of economic development was the main factor contributing to carbon emissions， and the economic efficiency of land use was the main factor inhibiting carbon emissions. Therefore， pursuing high-quality and sustainable economic development， enhancing land use intensification， promoting technological innovation， and building a strong ecological barrier is the best strategy for reducing carbon emissions from land use in Beijing-Tianjin-Hebei.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5391-5402"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Impact of Biochar Properties on Greenhouse Gas Emission Reduction and Yield Improvement in Farmlands of the Three Major Staple Crops].","authors":"Hao He, Ming-Jie Chen, Man Li, Jia-Bin Shi, Lin Zhao, Ke-Xi Qu, Qi Li, Zheng-Hua Hu","doi":"10.13227/j.hjkx.202409069","DOIUrl":"https://doi.org/10.13227/j.hjkx.202409069","url":null,"abstract":"<p><p>This study evaluated the impact on greenhouse gas emissions and crop yields of applying biochar with varying properties in the cultivation of the three major staple crops of rice， wheat， and maize with the aim of providing insights and strategies for promoting both emission reduction and yield enhancement in ecological agriculture. Based on 252 published papers from databases such as the Web of Science and CNKI， comprising 1 707 sets of experimental data， a Meta-analysis using a random effects model was conducted. The natural logarithm of the response ratio （ln<i>R</i>） was used as the effect size to quantify the impact of different biochar properties on greenhouse gas emissions， crop yield， and soil physicochemical properties. The results showed that different biochar properties had significantly different effects on greenhouse gas emissions. Overall， biochar presented the most significant effect on reducing N₂O emissions， with medium-temperature pyrolyzed （401-550℃） biochar reducing N₂O emissions in wheat fields by 33.94%， followed by the reductions of CH₄ and CO₂. High-temperature pyrolyzed （551-750℃） biochar reduced CH₄ emissions in rice fields by 19.74%. Biochar application significantly improved soil physicochemical properties， including increasing soil carbon and nitrogen levels， pH， and cation exchange capacity （CEC）. By enhancing soil fertility and improving soil structure， biochar significantly increased the yield of the three staple crops， with low C/N ratio （51-100） and low pH biochar showing the most notable yield improvements. By significantly reducing N₂O emissions and moderately reducing CH₄ emissions， biochar significantly lowered the global warming potential （GWP） and greenhouse gas emission intensity （GHGI） of farmlands. The study concluded that the reasonable application of different types of biochar effectively reduces greenhouse gas emissions and increases crop yields， achieving the dual benefits of emission reduction and yield enhancement. In practical applications， the configuration of biochar should be optimized based on crop type， soil conditions， and other factors.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5672-5681"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Ecological Risk Evaluation and Ecological Zoning Construction in the Upper Yangtze River Basin].","authors":"Bin-Sen Chen, Dan-Jing Yuan, Yi-Ran Mao, Wen-Yu Li, Chuan-Hao Wen","doi":"10.13227/j.hjkx.202407276","DOIUrl":"https://doi.org/10.13227/j.hjkx.202407276","url":null,"abstract":"<p><p>The upper reaches of the Yangtze River is an important ecological barrier for the entire Yangtze River Basin and a key national water source and conservation area， and its ecological risk problem constrains the sustainable development of the whole Yangtze River Basin. To evaluate the ecological environment security status of the upper Yangtze River， based on land use data from 1980 to 2020， the land use transfer matrix， ecosystem service value evaluation model， and ecological risk index model were applied to explore the spatial and temporal evolution patterns of ecosystem service provision value and ecological risk index in the upper Yangtze River Basin， and the <i>Z</i>-score standardization method was applied to construct four types of ecological zones. The results of the study follow： ① The changes of each land use type in the upper Yangtze River Basin were significant. However， the areas of unutilized land and arable land decreased more substantially， by 8 222 km² and 6 776 km²， respectively， accounting for 48.68% and 40.12% of the total decrease. ② Forest land was the most dominant land use type transferring out and transferring in， with areas of 121 125 km² and 129 424 km²， respectively， accounting for 32.26% and 34.47% of the total area of transfers out and transfers in. ③ The ecosystem service value showed a trend of decreasing and then increasing， with the high supply value area mainly distributed in northern Yunnan Province and southwestern Sichuan Province and the low supply value area mainly distributed in Chengdu Municipality， western Chongqing Municipality， and other areas with high population density. ④ The average ecological risk in the upper Yangtze River Basin showed a trend of fluctuating upward and then downward， gradually shifting to the medium-risk type， with a spatial distribution of \"high in the northwest and east， and low in the middle.\" ⑤ During the study period， the number of the four types of ecological zones changed little， and the ecological zones were in a stable state. Among them， the partition type with the largest proportion was the high supply value-low ecological risk zone， and the distribution area of the high supply value-high ecological risk zone was relatively small. The findings above provide theoretical references for the ecological security of the upper reaches of the Yangtze River as well as the coordinated development of the economy and ecological environment in the Yangtze River Basin.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5861-5871"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Microplastic Pollution Characteristics and Ecological Environmental Risk Assessment in Water and Sediments of the Yiluo River Basin].","authors":"Song-Ze Hao, Guo-Hao Wang, Jin Huang, Jie Pei, Shao-Feng Yan, Yan Zhang","doi":"10.13227/j.hjkx.202408005","DOIUrl":"https://doi.org/10.13227/j.hjkx.202408005","url":null,"abstract":"<p><p>To explore the pollution characteristics and ecological environmental risk of microplastics in water and sediment of the Yilo River Basin， water and sediment samples were collected from 15 monitoring sections， the types， abundance， and particle size of microplastics in the water and sediment were identified using an Agilent 8700 laser infrared imaging system （LDIR）， and the ecological and environmental risk of microplastics in water and sediment of the Yiluo River Basin were assessed by the pollution load index （PLI） and polymer risk index （<i>H</i>）. The results showed that the types of microplastics are consistent in the water and sediment of the Yiluo River Basin， but the proportion of microplastics differs. For example， fluororubber （FPM）， chlorinated polyethylene （CPE）， polyurethane （PU）， and acrylate copolymer （ACR） microplastics accounted for 35.22% and 23.58%， 12.12% and 5.19%， 7.11% and 13.52%， and 5.33% and 22.07% of the microplastics in the water and sediment， respectively. The particle size of microplastics in the water and sediment is mainly concentrated in the range of 0-100 μm， accounting for 89.01% and 83.88% of the distribution， respectively. The average abundance of microplastics in the water and sediment was （412.48±39.91） n·L^-1 and （11 646.58±3 129.37） n·kg^-1， respectively， and there was a significant difference in the abundance of microplastics among different sections. The maximum abundance of microplastics of 728.86 n·L^-1 and 52 864.44 n·kg^-1 occurred in water and sediment of sections S12 and S3， respectively. The maximum average abundance of FPM microplastics was （145.25±40.52） n·L^-1 in water， and the maximum average abundance of ACR microplastics was （2 877.92±2 255.12） n·kg^-1 in sediment. The pollution load index method and polymer risk index method showed consistency in the ecological environment risk assessment results of microplastics， and microplastics in the water and sediment of the Yiluo River Basin generally present high risk or above.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5961-5974"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Source Analysis and Risk Assessment of Heavy Metals and Fluoride Pollution in Soils of the Korla Oasis Area].","authors":"Wen-Wen Shi, Jun-Ling He, Peng-Wei Zhang, Shu-Tao Ai, Xiao-Yu Tang, Li-Ming Liu","doi":"10.13227/j.hjkx.202407258","DOIUrl":"https://doi.org/10.13227/j.hjkx.202407258","url":null,"abstract":"<p><p>To investigate the pollution status， pollution sources， and health risk of heavy metals and fluoride in soils of the Korla Oasis area， 6 180 soil samples were collected， and the content characteristics and spatial distributions of eight heavy metals （As， Cu， Cr， Pb， Hg， Ni， Zn， and Cd） and the non-metal F were determined and analyzed. The potential risk of heavy metals and fluoride and the presence of coldspot and hotspot areas were assessed using the land accumulation index method and the potential ecological risk index method. Correlation analysis and positive definite matrix factorization （PMF） modeling were utilized to resolve the sources of heavy metals and fluoride contamination quantitatively. The risk levels of heavy metals and fluoride in soils were quantified through Monte Carlo simulations and health risk assessment models. The results showed that the average contents of Cd， Ni， Pb， As， Cr， and F were high and exceeded the background values of surface soil in Xinjiang， F and Cd were enriched to a high degree， and there may be localized point sources of pollution for Hg. In terms of spatial distribution， Cu， Cd， Ni， Zn， Pb， As， and Cr showed a tendency of spreading from the aggregation area to the periphery， Hg was characterized by a point-like distribution， and the area of relatively high values of F was distributed in the middle of the study area in the form of a slice. The level of contamination in the study area was generally low， with the main contaminating element being Cd. The combined potential ecological risk of the soil is low， with Cd and Hg being the most important ecological risk contributors. Ecological risk hotspots are distributed in blocks and points in the western and eastern parts of the study area， and coldspots are distributed in blocks in the northern part of the study area. There are four potential sources of soil heavy metals and fluoride： industrial sources （Cd）， mixed agro-industrial sources （As， Hg， and Ni）， atmospheric precipitation sources （Pb and Cr）， and combined natural-agricultural sources （F）， contributing 8.9%， 13.5%， 9.6%， and 68.0%， respectively. The carcinogenic and non-carcinogenic risks of Ni， Cr， and As in soil to the recipient population were at tolerable levels， and the carcinogenic and non-carcinogenic risks of the remaining five heavy metals and F to the recipient population were negligible compared to the higher health risks to children， which need to be emphasized.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"6010-6023"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Structural and Functional Characteristics of Bacterial Communities in the Soil of Plants at the Desert-Transition Zone].","authors":"Xian-Yao Yang, Xue Wu, Cui-Ping Tian, Qian-Qian Yang, Xian-Tao Wang, Xuan Zhang, Zhou Zheng","doi":"10.13227/j.hjkx.202408008","DOIUrl":"https://doi.org/10.13227/j.hjkx.202408008","url":null,"abstract":"<p><p>To explore the interactions between desert plants and soil microecology and the environment under different habitats， the typical plants of <i>Tamarix ramosissima</i>， <i>Alhagi sparsifolia</i>， and <i>Salsola collina</i> in the desert and oasis transitional zone on the northern edge of the Tarim Basin were selected as research subjects. High-throughput sequencing technology was used to investigate the structure， diversity， functional differences， and influencing factors of bacterial communities in the rhizosphere soil under the two habitats. The results follow： ① The soil bacterial community is jointly influenced by environmental and genetic factors. ② Proteobacteria， Bacteroidetes， and Actinobacteria are the dominant bacterial phyla in the transitional zone habitat for the three plants； in the desert habitat， Bacteroidetes， Proteobacteria， and Firmicutes are absolutely dominant. ③ Correlation analysis indicated that soil moisture content， electrical conductivity， and soil microbial carbon significantly affect the structure of the soil microbial community （<i>P</i>&lt;0.05）， with the soil moisture content in the transitional zone being significantly higher than that in the desert habitat， blurring the impact of other environmental factors on microorganisms and becoming a key factor affecting the structure and function of the soil microbial community. ④ PICRUSt2 functional prediction indicated that the soil bacterial communities of the three typical desert plants include 6 primary functions and 43 secondary functions， with metabolic functions being the main functions， but different plants show differences in bacterial community and functional enrichment. The results enhance understanding of the impact of typical desert plants and habitat differences on soil microbial communities and provide a reference for soil microenvironments in subsequent desert ecological management and restoration.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5999-6009"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"[Effects of Biochar Application on Soil Carbon Pool Management Index and Organic Carbon Chemical Structure in <i>Eucalyptus</i> Plantations in Northern Guangxi].","authors":"Jun-Zhi Chu, Yu-Yi Shen, Zhi-Yi Mou, Xin-Yue Mao, Ke-Chao Huang, De-Nan Zhang, Qiu-Mei Teng, Ying-Jie Sun, Shi-Hong Lü, Guang-Ping Xu","doi":"10.13227/j.hjkx.202409003","DOIUrl":"https://doi.org/10.13227/j.hjkx.202409003","url":null,"abstract":"<p><p>Based on a long-term positioning experiment established in 2017 with biochar derived from <i>Eucalyptus</i> plantation waste branches pyrolyzed at high temperature （500℃） under anaerobic conditions， six treatments were established： CK （0%）， T1 （0.5%）， T2 （1.0%）， T3 （2%）， T4 （4%）， and T5 （6%）. The study explored the changes in soil organic carbon （SOC）， labile organic carbon （LOC）， carbon pool management index （CPMI）， and the chemical structure of organic carbon after a single application of different amounts of biochar over 5 years. The study produced several results： ① Compared to the control， biochar application significantly increased the contents of SOC， LOC， particulate organic carbon （POC）， non-labile organic carbon （NLOC）， and mineral-associated organic carbon （MOC） （<i>P</i>&lt;0.05）， with larger increments at high application rates （T4 and T5 treatments）. The soil CPMI showed a significant increasing trend with increase of biochar application. ② Biochar application increased the relative contents of alkyl carbon and aromatic carbon in the soil， while decreasing the relative contents of alkoxy carbon and carboxyl carbon （<i>P</i>&lt;0.05）. At high application rates， there was a significant increase in the alkyl carbon/alkoxy carbon ratio， hydrophobic carbon/hydrophilic carbon ratio， and aromatic carbon/alkoxy carbon ratio， and a decrease in the lipid carbon/aromatic carbon ratio （<i>P</i>&lt;0.05）， with an increased trend toward aromaticity. ③ Correlation and principal component analyses revealed that the soil CPMI was significantly positively correlated with SOC， LOC， POC， alkyl carbon， aromatic carbon， pH value， soil moisture content， total nitrogen， total phosphorus， total potassium， available nitrogen， available phosphorus， available potassium， microbial biomass carbon， microbial biomass nitrogen， and MOC （<i>P</i>&lt;0.01）. It was also positively correlated with MOC （<i>P</i>&lt;0.05） and negatively correlated with alkoxy carbon， carboxyl carbon， and soil bulk density （<i>P</i>&lt;0.01）. Redundancy analysis indicated that soil bulk density， LOC， SOC， total potassium， POC， microbial biomass carbon， and available potassium were key environmental factors affecting the soil CPMI and the chemical structure of organic carbon. In conclusion， the application of biochar to <i>Eucalyptus</i> plantation through 5 years improved soil quality， which is beneficial for enhancing soil carbon sequestration capacity and increasing the stability of soil organic carbon.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 9","pages":"5682-5693"},"PeriodicalIF":0.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145081718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}