Huan jing ke xue= Huanjing kexue最新文献

{"title":"[Carbon Emission Reduction Effect of Spatial Correlation Network Structure Characteristics: From the Perspective of Urban Agglomeration].","authors":"Hang Zheng,&nbsp;A-Zhong Ye","doi":"10.13227/j.hjkx.202201108","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201108","url":null,"abstract":"<p><p>Based on social network and regression analyses, this study conducted research with regard to the spatial correlation and effect of carbon emissions in urban agglomerations of the Pearl River Delta (PRD) with the data of prefecture-level cities in Pearl River Delta urban agglomerations from 2001 to 2019. As the results suggested, ① the carbon emission links among cities in PRD urban agglomerations were relatively loose, the subordinate structure changed frequently, and the carbon emission exchanges and cooperation among cities need to be strengthened. ② The core-periphery structure of the spatial correlation network of carbon emissions was loose to a certain extent, the control ability of the central city to the overall network structure was weakened, and the marginal cities gradually changed from being controlled to adopting a controlling role. ③ The improvement in the overall network tightness and stability and the breaking of the network hierarchical structure significantly reduced regional carbon emissions, whereas the improvement in individual network centrality significantly promoted urban carbon emission reduction. The above analysis will help to provide reference for coordinating carbon dioxide emission reduction and low-carbon city development policies.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4401-4407"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33503473","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":"[Hydrochemical and Isotopic Characteristics in the Surface Water of the Fenhe River Basin and Influence Factors].","authors":"Chun-Hong Zhao,&nbsp;Hao-Yong Shen,&nbsp;Zhi-Heng Wang,&nbsp;Yong-Ping Liang,&nbsp;Yi Zhao,&nbsp;Hao Xie,&nbsp;Chun-Lei Tang","doi":"10.13227/j.hjkx.202201103","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201103","url":null,"abstract":"<p><p>The Fenhe River Basin is the mother river of Shanxi Province. Due to the over-exploitation of water resources and the impact of social and economic development, the ecological environment has deteriorated. After a series of treatment and protection measures, the water quality has since been improved. Mathematical statistics, Piper diagrams, Gibbs model, hydrogen and oxygen isotopes, and other methods were used to analyze the characteristics and sources of hydrochemistry in the surface water of the Fenhe River basin, which revealed the evolution process of surface water quality of the Fenhe River basin. The results showed that the content of the main hydrochemical components in the main stream surface water of Fenhe River basin increased gradually along the runoff path. The hydrochemical types of surface water of Fenhe River basin were mainly HCO₃·SO₄·Cl-Ca·Na·Mg and SO₄·HCO₃·Cl-Ca·Na·Mg. There were great differences in hydrochemical components of tributaries and karst water in the basin. There were also great differences in hydrochemical components of tributaries in the basin. The hydrochemical types of surface water of karst water were mainly SO₄·HCO₃-Ca·Mg. The hydrochemical composition of surface water in Fenhe River basin was mainly affected by rock weathering and evaporation crystallization, whereas rainfall had little effect. Na⁺ and K⁺ mainly came from the dissolution of evaporated salt rocks with Na in the surrounding loess. Ca²⁺, Mg²⁺, and HCO₃^- mainly came from the dissolution of carbonate rocks. SO₄^2- may have also come from the dissolution of sulfide minerals in the loess layer around Fenhe River in addition to the dissolution of gypsum. The values of <i>δ</i>D and <i>δ</i>¹⁸O of Fenhe River surface water were gradually enriched from upstream to downstream. The characteristics of hydrogen and oxygen isotopes further showed that the surface water was mainly affected by evaporation. The results of this study can provide evidence for ecological restoration and protection and ecological civilization construction in the Fenhe River basin.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4440-4448"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33502922","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":"[Succession Pattern and Consequences of the Dominant Species During Cyanobacterial Bloom and Its Influencing Factors].","authors":"Tian Ouyang,&nbsp;Lu Zhao,&nbsp;Lu-Lu Ji,&nbsp;Song-Qi Yang,&nbsp;Bao-Hai Zheng,&nbsp;Yu-Xin Du,&nbsp;Jia-Xin Li,&nbsp;Yu-Xin Li,&nbsp;Jun-Qiong Shi,&nbsp;Zhong-Xing Wu","doi":"10.13227/j.hjkx.202112249","DOIUrl":"https://doi.org/10.13227/j.hjkx.202112249","url":null,"abstract":"<p><p>The succession of dominant species always occurs during cyanobacterial blooms because there are certain conditions for cyanobacterial blooms formed by different cyanobacteria; this results in more uncertain and complex effects in cyanobacterial blooms. However, the succession pattern and consequences of dominant species and its driving factors have not received enough attention during cyanobacteria blooms. In this study, the phytoplankton community characteristics and water environment factors of Nanpeng Reservoir, a drinking water source in Chongqing, were monitored and analyzed from April to September 2018. The results showed that:① a total of 108 species of phytoplankton belonging to 59 genera and 8 phyla were identified in Nanpeng Reservoir. Of this, 13 species of 4 phyla were identified as dominant species, among which the dominance index of <i>Cylindrospermopsis raciborskii</i> was the highest, followed by that of <i>Pseudoanabaena</i> sp. ② The most dominant cyanobacteria were <i>Pseudoanabaena</i> and <i>Cylindrospermopsis</i> in May and July, respectively, in which cyanobacteria density peaked, whereas the Shannon-Weiner diversity and Pielou evenness were significantly lower than those in the other months. ③ NMDS results showed that the correlation between <i>Cylindrospermopsis</i> or <i>Pseudoanabaena</i> and the ambient phytoplankton community was 0.58 and 0.48, respectively. Moreover, the VPA results showed that 47.51% of the community variation could be explained by environmental factors, and only 12.04% and 12.74% of variation in community composition could be explained by <i>Cylindrospermopsis</i> and <i>Pseudoanabaena</i>, respectively. ④ The abundance of <i>Cylindrospermopsis</i> was significantly positively affected by WT, pH, and RUE_N and negatively affected by SD and RUE_P. However, the abundance of <i>Pseudoanabaena</i> was significantly positively affected by permanganate index and negatively affected by EC and DO. These results suggested that both dominating cyanobacteria had significant effects on the surrounding phytoplankton community. Relative to that of <i>Pseudoanabaena</i>, however, <i>Cylindrospermopsis</i> had a more obvious impact on the aquatic ecosystem. Moreover, the synergistic effect of N limitation and warming of the water column may have caused the replacement of <i>Pseudoanabaena</i> with <i>Cylindrospermopsis</i> to form a dominant population.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4480-4488"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33502926","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":"[Response of Soil Respiration Rates to Soil Temperature and Moisture at Different Soil Depths of <i>Caragana korshinskii</i> Plantation in the Loess-Hilly Region].","authors":"Ya-Rong Sun,&nbsp;Ya-Juan Wang,&nbsp;Min Zhao,&nbsp;Wen-Yan Xue,&nbsp;Si-Qi Liang,&nbsp;Le Liu,&nbsp;Chao Liu,&nbsp;Yun-Ming Chen","doi":"10.13227/j.hjkx.202112253","DOIUrl":"https://doi.org/10.13227/j.hjkx.202112253","url":null,"abstract":"&lt;p&gt;&lt;p&gt;It is of great significance to clarify the influence of soil temperature and moisture on soil respiration rate and its characteristics in ecologically fragile regions under the background of climate change for the accurate assessment and prediction of carbon budgets in this region. The average CO&lt;sub&gt;2&lt;/sub&gt; concentration and soil temperature and moisture at different soil depths (10, 50, and 100 cm) were measured using a CO&lt;sub&gt;2&lt;/sub&gt; analyzer and temperature and moisture sensors. The soil respiration rate was calculated using Fick's first diffusion coefficient method. The dynamic characteristics of soil temperature, soil moisture, and soil respiration rate in different soil depths were explored, and the response of soil respiration rate to soil temperature and moisture were further analyzed. The results showed that the diurnal variation in soil respiration rate decreased significantly with the increase in soil depth (&lt;i&gt;P&lt;/i&gt;&lt;0.05), and the peak time lagged behind. Soil respiration rate in adjacent soil depths (10, 50, and 100 cm) lagged 1 h from top to bottom. The monthly variation in soil respiration rate was a multi-peak curve, in which the maximum soil respiration rates of 10, 50, and 100 cm soil depths were on July 25&lt;sup&gt;th&lt;/sup&gt;, August 6&lt;sup&gt;th&lt;/sup&gt;, and August 10&lt;sup&gt;th&lt;/sup&gt;, reaching 13.96, 2.96, and 1.47 μmol·(m&lt;sup&gt;2&lt;/sup&gt;·s)&lt;sup&gt;-1&lt;/sup&gt;, respectively. The effect of soil temperature on soil respiration rate decreased with the increase in soil depth. Soil temperature at 50 cm and below had no significant effect on soil respiration rate (&lt;i&gt;P&lt;/i&gt;&gt;0.05). The fitting index of 10 cm soil depth was the best (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.96), but the fitting indexes of 50 cm and 100 cm soil depths were poor (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.00 and &lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.01, respectively). The temperature sensitivity coefficient &lt;i&gt;Q&lt;/i&gt;&lt;sub&gt;10&lt;/sub&gt; decreased with the increase in soil depth. Soil moisture in different soil depths had significant effects on soil respiration rate (&lt;i&gt;P&lt;/i&gt;&lt;0.05), and the quadratic fitting indicated that 50 cm (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.35)&gt;10 cm (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.22)&gt;100 cm (&lt;i&gt;R&lt;/i&gt;&lt;sup&gt;2&lt;/sup&gt;=0.31). The combined effects of soil temperature and moisture in different soil depths could explain 96%, 6%-50%, and 22%-24% of soil respiration rate, respectively. In summary, the effects of soil temperature and moisture at different soil depths of the &lt;i&gt;Caragana korshinskii&lt;/i&gt; plantation in the loess-hilly region on soil respiration rate differed. The soil respiration rate of the 10 cm soil depth was affected by the comprehensive effect of soil temperature and moisture; however, the relative contribution of soil temperature was higher, and soil moisture at and below a soil depth of 50 cm was the key factor. These results could help improve predictions on the impact of future climate change on the carbon cycle of terrestrial ecosystems in the region and provide a theoretical basis for greenhouse gas regulation in the","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4648-4657"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33500857","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":"[Speciation and Pollution Assessment of Heavy Metals in Mangrove Surface Sediments in Jiulong River Estuary].","authors":"Hua-Lan Zhang,&nbsp;Rui-Lian Yu,&nbsp;Rui-An Wan,&nbsp;Gong-Ren Hu,&nbsp;Hua-Bin Huang,&nbsp;Ya-Qing Wu","doi":"10.13227/j.hjkx.202201010","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201010","url":null,"abstract":"<p><p>The speciation of heavy metals was analyzed using modified BCR four-step extraction methods to analyze the pollution of heavy metals in surface sediments collected from the mangrove wetland in Jiulong River Estuary. Subsequently, the pollution degree and the ecological risk of heavy metals were evaluated by using the ratio of secondary phase to primary phase (RSP), risk assessment code (RAC), and modified potential ecological risk index (MRI) assessment methods. The results of BCR four-step extraction showed that Cd (52.55%) and Mn (47.71%) mainly existed in weak-acid extractable fractions. Pb, Y, and Cu mainly existed in reducible and oxidizable fractions. Ba, Tl, V, Th, Cr, As, U, Hg, Ni, Zn, and Co mainly existed in residue fractions. The results of RSP showed that the sediments were heavily polluted by Cd and Mn and moderately polluted by Pb. Cu, Y, and Co were slightly polluted, whereas Zn, Hg, As, U, Ni, Cr, Th, V, Ba, and Tl were not polluted. The results of RAC showed that Cd and Mn were high risk, whereas Co and Zn were moderate risk. Ni, Cu, Hg, and Y were slight risk, and the other elements (U, As, Pb, Cr, V, Tl, Ba, and Th) presented no risk. The MRI results showed that the comprehensive potential ecological risk of heavy metals was serious in the surface sediments, whereas Hg and Cd were the main contribution factors. Hg was a serious potential hazard, followed by Cd. Tl was a medium potential hazard, and the other elements were low potential hazards. These results demonstrated that the mangroves were polluted by heavy metals in Jiulong River Estuary, and effective strategies should be employed to remediate the mangrove sediment in the future.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4601-4612"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33501418","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":"[Response Characteristics of Soil Microbial Community Under Long-term Film Mulching].","authors":"Zhi-E Hu,&nbsp;Mou-Liang Xiao,&nbsp;Ji-Na Ding,&nbsp;Jian-Hong Ji,&nbsp;Jian-Ping Chen,&nbsp;Ti-da Ge,&nbsp;Shun-Bao Lu","doi":"10.13227/j.hjkx.202201237","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201237","url":null,"abstract":"<p><p>Film mulching is an important practice to increase the yield and income in agricultural production. Soil samples were collected from four farmland sites with different mulching years to reveal the effect of long-term plastic mulching on characteristics of soil microbial community structure. In order to explore the long-term effect of soil microbial community change and its effect on the microbial ecological environment, high-throughput sequencing technology was used to analyze the changes in soil bacterial and fungal community structure. The results showed that long-term film mulching had no significant effect on soil bacterial diversity but decreased fungal diversity. Long-term film mulching decreased the abundance of Acidobacteriota and Mortierellomycetes and increased the abundance of Actinobacteriota. Long-term film mulching enriched the beneficial microbial communities such as <i>Bacillus</i>, Nocardioidaceae, <i>Aspergillus</i>, and Hypocreales in soil. However, long-term film mulching indued a simple and fragile soil fungal co-occurrence network pattern. The unidentified Sordariales under Ascomycota was the only key species in the fungal co-occurrence network, which resulted in potential risks to the ecological environment of the farmland soil. This study provided a theoretical basis for further understanding the effects of long-term film mulching on the ecological and environmental effects of microorganisms in farmland.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4745-4754"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33501766","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":"[Sources and Biogeochemical Processes of Nitrate in the Laolongdong Karst Underground River Basin, Chongqing].","authors":"Yu-Yang Wang,&nbsp;Ping-Heng Yang,&nbsp;Jie-Ru Zhang","doi":"10.13227/j.hjkx.202112316","DOIUrl":"https://doi.org/10.13227/j.hjkx.202112316","url":null,"abstract":"<p><p>Samples of sewage, well water, and underground river water of the urbanized Laolongdong karst underground river basin in Chongqing, China were collected during July 2019 and October 2020 and measured to determine the nitrate origin and biogeochemical processes based on geochemistry and dual nitrate isotope (<i>δ</i>¹⁵N-NO₃^- and <i>δ</i>¹⁸O-NO₃^-) data. The results showed that:① the isotopic nitrate compositions of sewage ranged from -3.3‰ to 14.6‰ for <i>δ</i>¹⁵N-NO₃^- and from -5.2‰ to 20.6‰ for <i>δ</i>¹⁸O-NO₃^-, which indicated that nitrate originated from manure and sewage, fertilizer, and soil organic nitrogen. The <i>δ</i>¹⁵N-NO₃^- and <i>δ</i>¹⁸O-NO₃^- of well water varied from 3.1‰ to 12.6‰ and 2.9‰ to 8.9‰, respectively, suggesting nitrate was mainly from soil organic nitrogen and manure and sewage. For the underground river water, the <i>δ</i>¹⁵N-NO₃^- and <i>δ</i>¹⁸O-NO₃^- ranged from 5.6‰ to 28.6‰ and from -2.0‰ to 15.7‰, respectively, suggesting that municipal sewage and manure were the dominate nitrate sources. ② Based on the MixSIAR model, manure and sewage were the primary nitrate source of the underground river water, accounting for 89.1% of the total contribution, whereas the contributions of soil organic nitrogen, fertilizer, and atmospheric precipitation were 4.4%, 3.4%, and 3.1%, respectively. ③ In the basin, the concentration ratios of COD:<i>ρ</i>(NO₃^-) from low to high were as follows:well water (0.14-5.15), underground river water (0.50-9.36), and sewage (4.08-89.50). Only 50% of well water samples with COD:<i>ρ</i>(NO₃^-) were slightly higher than 0.65, which is the minimum stoichiometric ratio for denitrification occurrence. This indicated that there were insufficient COD concentrations to support that denitrification occurred in the well water. This was further verified by no significant enrichment of nitrogen and oxygen isotopes. As much as 90% of underground river water samples had a COD:<i>ρ</i>(NO₃^-) higher than 0.65, and the dual nitrate isotopes were simultaneously enriched with a <i>δ</i>¹⁵N:<i>δ</i>¹⁸O of 1.8, which is within the ratios ranging from 1.3 to 2.1, indicating that denitrification occurred. The COD:<i>ρ</i>(NO₃^-) for all wastewater samples was much higher than 0.65, of which 25% were higher than the stoichiometric ratio (29.34) for the occurrence of dissimilation reduction nitrate to ammonium (DNRA). The <i>δ</i>¹⁵N-NO₃^- and <i>ρ</i>(NH₄⁺):<i>ρ</i>(NO₃^-) of sewage increased simultaneously, indicating that DNRA may have occurred in the sewage.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4470-4479"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33502925","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":"[Concentrations and Community Structures of Culturable Bacteria in Aerosols of Household Garbage Stations in Shanghai].","authors":"Bing-Jie Lu,&nbsp;Xiang Zhang,&nbsp;Chuan Wang,&nbsp;Jun Tai,&nbsp;Dan Li","doi":"10.13227/j.hjkx.202112088","DOIUrl":"https://doi.org/10.13227/j.hjkx.202112088","url":null,"abstract":"<p><p>The airborne microorganism has attracted increasing attention, and household garbage carries various pathogenic bacteria that affect the surrounding environment and public health. In this study, the culturable bacteria in the air were collected by using a six-level Anderson sampler, and the temperature, relative humidity, PM_2.5, and PM₁₀ in the garbage stations and their surrounding environment were recorded. The relationships between environmental factors and culturable bacterial pollution in the air were also analyzed. The results showed that the culturable bacterial concentrations in five sampling sites (the garbage station of a villa and the area downwind, the garbage station of a campus, the roof of an office building, and the garbage station of a residential area) were (1254±92), (280±123), (172±47), (84±18), and (175±174) CFU·m^-3, respectively. The concentrations of the culturable bacteria in the garbage station of the villa were significantly higher than those of other sampling sites, mainly because there were biochemical treatment facilities for the on-site treatment of wet garbage in the garbage house. The sizes of the culturable bacteria in the garbage station of the villa mainly ranged from 1.1-4.7 μm, and the bacterial sizes at the other four sampling sites were primarily larger than 7 μm, with a few bacteria ranging from 1.1-2.1 μm. In this study, Proteobacteria and Firmicutes were the dominant phyla, and <i>Corynebacterium</i> and <i>Bacillus</i> were the dominant genera. More importantly, some opportunistic pathogens such as <i>Corynebacterium, Staphylococcus,</i> and <i>Acinetobacter</i> were also detected. The concentrations of the culturable bacteria in the garbage station of the villa were highly correlated with temperature, relative humidity, PM_2.5, and PM₁₀. <i>Exiguobacterium</i> in the air was highly correlated with PM₁₀, temperature, and relative humidity. The health hazard quotient (HQ) values of the five sampling sites were all less than 1; however, the results of microbial quantitative risk assessment showed that the health risks of the male and female staff in the three garbage houses were all higher than the corresponding reference values. This study revealed the influence of garbage stations on the bioaerosol in the surrounding environment and provided references for the evaluation of air quality in and around garbage stations.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4367-4379"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33503470","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":"[Distribution, Risk, and Influencing Factors of Microplastics in Surface Water of Huangshui River Basin].","authors":"Meng-Yuan Fan,&nbsp;Yi-Mei Huang,&nbsp;Hai-Xin Zhang,&nbsp;Hao-Hao Li,&nbsp;Qian Huang","doi":"10.13227/j.hjkx.202201087","DOIUrl":"https://doi.org/10.13227/j.hjkx.202201087","url":null,"abstract":"<p><p>In order to explore the distribution of microplastics in the freshwater environment of Qinghai-Tibet Plateau, 63 surface water samples were collected in Huangshui River basin of Qinghai province during the wet season, and the distribution characteristics and main influencing factors of microplastics in the surface water were analyzed by means of metallographic microscope, Fourier infrared spectroscopy, field investigation, and image data analysis. The potential ecological risks of microplastics were evaluated using risk index (<i>H</i>) and pollution load index (PLI) models. The abundance of microplastics in surface water ranged from 665-8780 n·m^-3, with the highest average abundance of 5414 n·m^-3 in Huangyuan County. The abundance of microplastics increased from upstream to downstream. The main colors of microplastics were transparent (67%) and black (17%), and the particle size was less than 50 μm (70%). Polyethylene (66%) and polypropylene (12%) were the main polymer types. The abundance of microplastics was positively correlated with cultivated land area, precipitation, and ultraviolet intensity, but the opposite results were observed in dissolved oxygen, redox potential, and wind speed. Additionally, the potential ecological risk of surface water in the Huangshui River basin was relatively low.</p>","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4430-4439"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33503476","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 Soil Amendments on the Bacterial Diversity and Abundances of Pathogens and Antibiotic Resistance Genes in Rhizosphere Soil Under Drip Irrigation with Reclaimed Water].","authors":"Bing-Jian Cui,&nbsp;Er-Ping Cui,&nbsp;Chun-Cheng Liu,&nbsp;Chao Hu,&nbsp;Xiang-Yang Fan,&nbsp;Zhong-Yang Li,&nbsp;Feng Gao","doi":"10.13227/j.hjkx.202111267","DOIUrl":"https://doi.org/10.13227/j.hjkx.202111267","url":null,"abstract":"&lt;p&gt;&lt;p&gt;Due to reclaimed water, irrigation can cause human health and environmental risks. Soil amendments are applied to reveal the abundance of pathogens and antibiotic resistance genes in rhizosphere soil irrigated by reclaimed water and to better understand the effects of environmental factors on the rhizosphere soil bacterial composition, which has guiding significance for the reasonable use of soil amendments. In this study, the effects of biochar, bioorganic fertilizer, humic acid, loosening soil essence, and corn vinasse on bacterial community diversity and certain gene abundances in rhizosphere soil under drip irrigation with reclaimed water were studied using high-throughput assays and quantitative PCR. The results showed that biochar significantly increased pH, organic matter, and total nitrogen contents in the rhizosphere soil. The corn vinasse significantly decreased soil pH and increased the contents of total nitrogen and total phosphorus but significantly increased the soil EC value (&lt;i&gt;P&lt;/i&gt;&lt;0.05). The effects of the five soil amendments on the &lt;i&gt;α&lt;/i&gt;-diversity of rhizosphere bacteria were not significantly different. The bacterial community structure and diversity of rhizosphere bacteria were similar at different taxonomic levels, but their relative abundance was different. &lt;i&gt;α&lt;/i&gt;-Proteobacteria, &lt;i&gt;γ&lt;/i&gt;-Proteobacteria, Bacteroidia, Actinobacteria, Acidimicrobiia, and Anaerolineae were the dominant bacteria in all treatments. The dominant genera consisted of &lt;i&gt;Pseudomonas, Sphingobium, Sphingomonas, Cellvibrio, Allorhizobium&lt;/i&gt;-&lt;i&gt;Neorhizobium&lt;/i&gt;-&lt;i&gt;Pararhizobium&lt;/i&gt;-&lt;i&gt;Rhizobium, Flavobacterium&lt;/i&gt;, and &lt;i&gt;Algoriphagus&lt;/i&gt; (relative abundance&gt;1%). Correlation analysis of environmental factors showed that the composition of the rhizosphere bacterial community was strongly correlated with pH, EC, total nitrogen, and total phosphorus content. The abundances of pathogenic bacteria and antibiotic resistance genes were 10&lt;sup&gt;3&lt;/sup&gt;-10&lt;sup&gt;7&lt;/sup&gt; copies·g&lt;sup&gt;-1&lt;/sup&gt; and 10&lt;sup&gt;4&lt;/sup&gt;-10&lt;sup&gt;8&lt;/sup&gt; copies·g&lt;sup&gt;-1&lt;/sup&gt;, respectively. There were significant differences in the detection levels of pathogens and antibiotic resistance genes. Bioorganic fertilizer, loosening soil essence, and corn vinasse significantly increased the abundances of some antibiotic resistance genes, whereas humic acid and corn vinasse significantly decreased the abundances of &lt;i&gt;Pseudomonas syringae, Ralstonia solanacearum,&lt;/i&gt; and total coliforms (&lt;i&gt;P&lt;/i&gt;&lt;0.05). A significant correlation was found between pathogens (&lt;i&gt;Arcobacter, Bacillus cereus, Pantoea agglomerans,&lt;/i&gt; and &lt;i&gt;Fecal bacteroidetes&lt;/i&gt;) and antibiotic resistance genes (&lt;i&gt;tetA, tetB, tetO, tetQ, sul1, ermB&lt;/i&gt;, and &lt;i&gt;ermC&lt;/i&gt;). In conclusion, while monitoring pathogens and antibiotic resistance genes in the agricultural environment under reclaimed water irrigation, attention should be paid to the rational application of soil amendments to avoid exacerbating the spread of biologi","PeriodicalId":172067,"journal":{"name":"Huan jing ke xue= Huanjing kexue","volume":"43 10","pages":"4765-4778"},"PeriodicalIF":0.0,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"33526055","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}