Pedosphere最新文献

{"title":"Biological nitrogen fixation in paddy soils is driven by multiple edaphic factors and available phosphorus is the greatest contributor","authors":"Tianlong HU ,&nbsp;Yanhui ZHANG ,&nbsp;Hui WANG ,&nbsp;Haiyang JIN ,&nbsp;Benjuan LIU ,&nbsp;Zhibin LIN ,&nbsp;Jing MA ,&nbsp;Xiaojie WANG ,&nbsp;Qi LIU ,&nbsp;Hongtao LIU ,&nbsp;Zhe CHEN ,&nbsp;Rong ZHOU ,&nbsp;Penghui JIN ,&nbsp;Jianguo ZHU ,&nbsp;Gang LIU ,&nbsp;Qicheng BEI ,&nbsp;Xingwu LIN ,&nbsp;Zubin XIE","doi":"10.1016/j.pedsph.2023.09.002","DOIUrl":"10.1016/j.pedsph.2023.09.002","url":null,"abstract":"<div><div>Biological nitrogen (N) fixation (BNF) is important for sustainable rice cultivation. Various edaphic factors have been individually evaluated for their effects on BNF in paddy soils. However, no single factor could fully explain the different soil outcomes. Paddy BNF is more likely to be simultaneously influenced to various degrees by combinations of several edaphic factors; however, the relative importance of the interaction of multiple edaphic factors on the regulation of BNF in paddy soils is still unclear. Twenty-seven paddy soil samples with different soil properties were collected from the major rice cropping areas in Southwest and Northeast China to determine the edaphic factors affecting paddy BNF amount. Rice was transplanted into pots filled with paddy soils and grown in a ¹⁵N₂-enriched airtight chamber. Estimation of BNF was based on the measurements of ¹⁵N enrichment in the paddy soils and rice plants at the end of a 77-d incubation period. The BNF amounts ranged from 0.66 to 12.3 kg ha^-1, with a significant positive relationship with available phosphorus (AP) and significant quadratic relationships with available molybdenum (AMo) and total N (TN). Available P explained 42% of the observed variation in BNF, TN explained 17%, and AMo explained 13%. The specific interaction between soil cation exchange capacity and available soil N (as determined by rice N uptake) accounted for 28% of the variation in BNF. The BNF amount was decreased when AP was &lt; 14 mg kg^-1, AMo &lt; 0.09 mg kg^-1, or TN was &gt; 3.2 g kg^-1. These results provide valuable benchmarks that could be used to guide farmers in managing paddy soils to improve the potential contribution of paddy BNF to soil fertility.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 993-1001"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46666972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mitigating effects of various phosphorus sources on arsenic toxicity under anaerobic conditions for rice and aerobic conditions for sunflower and maize plants","authors":"Mehmet B. TASKIN ,&nbsp;Hanife AKCA ,&nbsp;Selver KAN ,&nbsp;Havva TASKIN ,&nbsp;Saima K. BABAR ,&nbsp;Yusuf K. KADIOGLU ,&nbsp;Kiymet DENIZ ,&nbsp;Aydin GUNES","doi":"10.1016/j.pedsph.2023.07.002","DOIUrl":"10.1016/j.pedsph.2023.07.002","url":null,"abstract":"<div><div>Arsenic (As) contamination is one of the major factors that contribute to environmental pollution, and it plays havoc with sustainability of crop production. Nano-hydroxyapatite (nHAP) can be an effective phosphorus (P) source to cope with As toxicity. The mitigating effects of variable P sources on As toxicity in rice, sunflower, and maize grown in an alkaline soil were evaluated. Arsenic was applied at 0 and 20 mg kg^-1, and P was applied at 0, 50, and 500 mg kg^-1 in the forms of triple superphosphate (TSP) and nHAP. In addition, the same amount of phosphoric acid was also used in the sunflower and maize experiments with the other P sources. The structural and functional properties of nHAP were determined by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Stunted growth was observed in rice, and less in sunflower; maize remained unaffected by As toxicity. In the presence of As, TSP and nHAP at their high doses (500 mg kg^-1) significantly increased the rice dry weight compared with the control (0 mg kg^-1). The As concentration in rice was decreased by approximately 25% in the presence of 50 mg kg^-1 TSP and 500 mg kg^-1 nHAP. The P treatments had no significant effect on the As concentration in sunflower, whereas the As concentration in maize was increased by 500 mg kg^-1 TSP. In the absence and presence of As, nHAP at 50 mg kg^-1 significantly increased rice P concentration, whereas in the presence of As, 500 mg kg^-1 TSP significantly increased P concentration in rice compared with the control. Arsenic had no significant effect on sunflower P concentration, while the maize P concentration was decreased in the 0 mg kg^-1 P treatment. It can be concluded that TSP and nHAP were effective in alleviating As toxicity in rice and sunflower. Comparative studies are further needed to determine the long-term effects of TSP and nHAP on prevention of As toxicity in field conditions.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1146-1157"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48022832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fe(II) oxidation after microbial Fe(III) reduction does not cause Cd release","authors":"Zhaoyang SUN ,&nbsp;Wenjun ZHANG ,&nbsp;Lei WANG ,&nbsp;Hongwen SUN ,&nbsp;Yuxuan WAN ,&nbsp;Qi LI ,&nbsp;Chaolei YUAN","doi":"10.1016/j.pedsph.2023.09.009","DOIUrl":"10.1016/j.pedsph.2023.09.009","url":null,"abstract":"<div><div>Soil flooding and drainage can cause the reduction and oxidation of iron (Fe), as well as the immobilization and mobilization of cadmium (Cd). However, the impact of Fe(II) oxidation following microbial Fe(III) reduction on Cd mobility remains unclear. In this study, we examined the behavior of Cd during microbial reduction of Fe(III) oxides and subsequent chemical re-oxidation of Fe(II) using batch reactor systems. The bacterium <em>Shewanella oneidensis</em> MR-1 was incubated with ferrihydrite, lepidocrocite, goethite, or hematite anaerobically and then aerobically in media containing 212 μg L^-1 Cd, with or without pH buffering (initial pH = 7.0). Compared to the control systems without MR-1, microbial Fe(III) reduction significantly promoted the immobilization of dissolved Cd, as well as the conversion of dissolved and adsorbed Cd to strongly bound Cd that could not be extracted by 0.4 mol L^-1 HCl. The mechanisms of Cd immobilization were different during the microbial reduction of different Fe(III) oxides. The buffering of system pH affected the phase of Fe oxides formed at the reduction and oxidation stages in the systems containing MR-1 and ferrihydrite or lepidocrocite. Nevertheless, in all the systems containing MR-1 and Fe oxides, irrespective of pH buffering, the concentration of dissolved Cd dropped to &lt; 1 μg L^-1 after 35 d of anaerobic incubation and remained &lt; 4 μg L^-1 after subsequent 72 h of aerobic incubation. This suggests that Fe(II) oxidation after microbial Fe(III) reduction (generating 0.025–0.22 g L^-1 Fe(II)) does not result in Cd release.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1076-1085"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Long-term fallowing produces specific fungal taxa associated with soil carbon storage","authors":"Fang LI ,&nbsp;Lin CHEN ,&nbsp;Yue LI ,&nbsp;Yanlai HAN ,&nbsp;Yi WANG ,&nbsp;Peipei LI ,&nbsp;Shuiqing ZHANG ,&nbsp;Jiabao ZHANG","doi":"10.1016/j.pedsph.2023.10.001","DOIUrl":"10.1016/j.pedsph.2023.10.001","url":null,"abstract":"<div><div>Cropland expansion has caused the loss of soil organic carbon (SOC) and the degradation of microbial communities. Fallowing is an important strategy for soil restoration, and fungi are critical in soil fertilization. This study compared the soil properties and fungal assemblage in two adjacent environments (farmland <em>vs</em>. fallowing) using a 30-year field experiment composed of five treatments: fallowing and agricultural management under no fertilization, chemical fertilization, and chemical fertilization plus cow manure or crop straw. The fallowed soil had more diverse fungi and maintained higher SOC than the artificially managed treatments. Importantly, the relative abundance of Chaetomiaceae was positively correlated with all the carbon components (SOC, dissolved organic carbon, and microbial biomass carbon) simultaneously. An RNA-Seq of <em>Trichocladium uniseriatum</em>, the key fungus affiliated with Chaetomiaceae, showed that straw addition significantly upregulated the genes for <em>T. uniseriatum</em> melanogenesis, resulting in recalcitrant necromass formation. A remarkable carbon dioxide (CO₂) assimilation capacity of <em>T. uniseriatum</em> was revealed using ¹³C-labelling assay. Therefore, <em>T. uniseriatum</em> improved SOC storage directly by CO₂ fixation and indirectly by melanogenesis. Fertilization of agricultural systems can stimulate the growth of <em>T. uniseriatum</em>. Inoculation of <em>T. uniseriatum</em> promoted crop growth, facilitating carbon absorption from the roots. This study highlights that the valuable microbial species resources preserved in fallowed soils can improve farmland ecosystems.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1014-1025"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135849264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical modeling of double-ring infiltrometers for determining saturated hydraulic conductivity of heterogeneous and anisotropic soils","authors":"Xiaoting XIE ,&nbsp;Hongxiang ZHOU ,&nbsp;Laosheng WU ,&nbsp;Jun MAN","doi":"10.1016/j.pedsph.2023.07.016","DOIUrl":"10.1016/j.pedsph.2023.07.016","url":null,"abstract":"<div><div>Philip's two-term infiltration equation has been widely used to infer soil saturated hydraulic conductivity (<em>K</em>_s), the accuracy of which is usually influenced by the size of infiltration rings and soil conditions. Previous studies have primarily focused on exploring the ring-size dependence of <em>K</em>_s estimations under specific soil conditions (<em>e.g</em>., soil isotropy and/or uniform initial water content). This study aimed to provide a comprehensive analysis by systematically considering eight heterogeneous and anisotropic soils with nonuniform initial water contents. Specifically, we examined the validity of Philip's infiltration equation as well as the recently proposed two forms (<em>i.e</em>., infiltration and time forms) of Parlange's infiltration equation both theoretically and in practical applications of double-ring infiltration. Then the time form of Parlange's equation was applied to infer <em>K</em>_s using double-ring infiltrometer measurements with different combinations of six inner ring diameters (10, 20, 40, 80, 120, and 200 cm) and three buffer index (defined as the ratio of the difference between inner and outer ring diameters to the outer ring diameter) values (0.20, 0.33, and 0.50). For each infiltrometer set, 20 stochastic <em>K</em>_s fields were randomly generated by adopting five standard deviation values (0.1, 0.3, 0.5, 0.7, and 0.9). Furthermore, we investigated the effects of five horizontal correlation lengths (30, 60, 150, 300, and 600 cm) on <em>K</em>_s estimations. The results demonstrated that Parlange's equation, compared to Philip's equation, was more universal in describing the cumulative infiltration relationship for the test soils. The combination of inner ring diameter and buffer index of 40 cm and 0.2, respectively, which satisfied most of the practical requirements for determining <em>K</em>_s in the Soil Water Infiltration Global (SWIG) database was optimal. When the horizontal correlation length exceeded a threshold (<em>i.e</em>., 150 cm in our study), the inner ring diameter was required to increase to 80 cm. Our findings contribute to accurate <em>K</em>_s estimations of different soils using double-ring infiltrometers.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1111-1122"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49417698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polyamide nylon 6 microplastics enhance nitrification activity in two agricultural soils","authors":"Areti NTAVIGLAKI ,&nbsp;Vasileios A. TZANAKAKIS ,&nbsp;Georgios GIANNOPOULOS ,&nbsp;Angeliki MARAGKAKI ,&nbsp;Ioannis ANASTOPOULOS ,&nbsp;Pantelis BAROUCHAS ,&nbsp;Ioannis PASHALIDIS ,&nbsp;Nikolaos MONOKROUSOS","doi":"10.1016/j.pedsph.2023.07.018","DOIUrl":"10.1016/j.pedsph.2023.07.018","url":null,"abstract":"","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1158-1162"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46633859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Role of nosZ I-carrying microorganisms in regulating nitrous oxide reduction during forest conversion: A comparison of plantations and a secondary forest in subtropical soils","authors":"Milin DENG ,&nbsp;Guiping YE ,&nbsp;Hang-Wei HU ,&nbsp;Chao XU ,&nbsp;Ping YANG ,&nbsp;Yong ZHENG ,&nbsp;Jupei SHEN ,&nbsp;Shengsheng JIN ,&nbsp;Ji-Zheng HE ,&nbsp;Yongxin LIN","doi":"10.1016/j.pedsph.2023.09.006","DOIUrl":"10.1016/j.pedsph.2023.09.006","url":null,"abstract":"<div><div>The conversion of natural forests in subtropical regions to plantations or secondary forests has resulted in alterations in soil variables, microbial communities, and microbially mediated processes, including nitrous oxide (N₂O) emissions. However, how forest conversion influences soil N₂O reduction and the abundance and community structure of N₂O-reducing microorganisms remains unclear. Here, we investigated the impact of converting natural forests to a secondary forest and <em>Cunninghamia lanceolata</em> and <em>Pinus massoniana</em> plantations on the abundance and community structure of N₂O-reducing microorganisms in both bulk soils and soil aggregates. Compared with the secondary forest, plantations had higher soil pH and available phosphorus and moisture contents, lower soil NH₄⁺ content, but similar aggregate sizes. Compared with the secondary forest, the conversion of natural forest to plantations resulted in significantly higher soil N₂O reduction rate and increased abundances of <em>nosZ</em> I and <em>nosZ</em> II genes in bulk soils and soil aggregates. The abundance of <em>nosZ</em> I was higher than that of <em>nosZ</em> II in all tested soils and had a stronger association with N₂O reduction rate, suggesting the greater role of <em>nosZ</em> I-carrying microorganisms in N₂O consumption. Forest conversion had a greater impact on the community composition of <em>nosZ</em> I than <em>nosZ</em> II, mainly by increasing the relative abundances of alpha- and beta-Proteobacteria, while decreasing gamma-Proteobacteria. However, <em>nosZ</em> II-carrying microorganisms were exclusively dominated by Gemmatimonadetes and less affected by forest conversion. Taken together, our findings significantly contribute to our understanding of the eco-physiological characteristics of N₂O-reducing microorganisms and highlight the importance of <em>nosZ</em> I-carrying microorganisms in N₂O consumption in subtropical forest soils.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 6","pages":"Pages 1066-1075"},"PeriodicalIF":5.2,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated ammonium and nitrate nitrogen supply alters the composition and functionalities of rice rhizosphere bacterial communities and enhances nitrogen use efficiency","authors":"Zaid KHAN ,&nbsp;Xujian YANG ,&nbsp;Xianting FAN ,&nbsp;Songpo DUAN ,&nbsp;Chunmei YANG ,&nbsp;Mohammad Nauman KHAN ,&nbsp;Anas IQBAL ,&nbsp;Hong SHEN ,&nbsp;Youqiang FU","doi":"10.1016/j.pedsph.2024.08.002","DOIUrl":"10.1016/j.pedsph.2024.08.002","url":null,"abstract":"<div><div>Nitrogen (N) is the most important nutrient for plants; however, microbe-mediated N transformation under different N forms is unclear. This experiment investigated the effects of four treatments fertilized with various N forms, no N (control, CK), 100% ammonium N (AN), 100% nitrate N (NN), and 50% ammonium N + 50% nitrate N (ANNN), on soil chemical properties, rhizosphere bacterial network, and rice growth. The ANNN treatment enhanced soil pH by 6.9%, soil organic carbon by 12%, and microbial biomass N (MBN) by 60% compared to CK. The linear discriminant effect size (LEfSe) analysis indicated four highly abundant biomarkers of bacterial communities each in the CK, NN, and AN treatments, while the ANNN treatment showed six highly abundant biomarkers with maximum effect size and linear discriminant analysis (LDA) score &gt; 4. The 16S rRNA gene-predicted functions under PICRUST indicated glutathione metabolism and proteasome and Tax4Fun recorded amino acid metabolism in the ANNN treatment. The combination of ammonium and nitrate N (<em>i.e</em>., the ANNN treatment) significantly increased the expression levels of the genes encoding N metabolism, including <em>AMT1</em>, <em>NRT2.1</em>, <em>GS1</em>, and <em>GOGAT1</em>, and induced 39%, 27%, 35%, and 38% increase in nitrate reductase, nitrite reductase, glutamine synthetase, and glutamate synthase, respectively, in comparison to CK. In addition, the ANNN treatment promoted rice leaf photosynthetic rate by 37%, transpiration rate by 41%, CO₂ exchange rate by 11%, and stomatal conductance by 18% compared to CK, while increased N use efficiency (NUE) by 10% and 19%, respectively, compared to the AN and NN treatments. These findings suggest that the combination of ammonium and nitrate N can promote bacterial community abundance, composition, and functional pathways by improving soil properties and can increase NUE and rice growth. This study provides a theoretical basis for the rational application of N fertilizers and the implications of this approach for future sustainable crop production.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"35 5","pages":"Pages 914-930"},"PeriodicalIF":7.3,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Drying and rewetting affect chemical speciation and bioavailability of soil phosphorus in a hyper-arid desert ecosystem","authors":"Yanju GAO ,&nbsp;Akash TARIQ ,&nbsp;Fanjiang ZENG ,&nbsp;Jordi SARDANS ,&nbsp;Dhafer A. AL-BAKRE ,&nbsp;Josep PEÑUELAS","doi":"10.1016/j.pedsph.2024.08.004","DOIUrl":"10.1016/j.pedsph.2024.08.004","url":null,"abstract":"<div><div>Climate change is expected to alter the frequency and intensity of drying-rewetting cycles, impacting water availability and consequently soil nutrient availability. However, the effects of these fluctuations on the chemical speciation and bioavailability of phosphorus (P) in soil remain uncertain, both in the presence of desert species and in their absence. We conducted a pot experiment involving bare soil (absence of plants) and two desert species (<em>Alhagi sparsifolia</em> and <em>Calligonum mongolicum</em>) to determine the short-term impacts of drought (no water supply), drying-rewetting 1 (D-RW1, high frequency of low water inputs), and drying-rewetting 2 (D-RW2, low frequency of high water inputs) on soil Hedley P pools, plant P concentration, and plant biomass accumulation. Results demonstrated that the presence of plants significantly increased soil labile P and organic P (Po) concentrations by 60%–150% and 1%–68%, respectively, compared to the absence of plants. Both D-RW1 and D-RW2 treatments significantly increased soil dissolved organic carbon concentration by 2%–35% relative to the drought treatment. Moreover, in the presence of <em>A. sparsifolia</em>, soil resin-extractable P and NaHCO₃-extractable inorganic P (Pi) concentrations in the D-RW1 treatment significantly increased by 31% and 75%, respectively, when compared to the drought treatment, with the NaHCO₃- and NaOH-extractable Po concentrations in the D-RW2 treatment rising by 14% and 32%, respectively. Furthermore, the D-RW2 treatment significantly increased leaf P concentration and plant biomass compared to the D-RW1 and drought treatments. Overall, compared to the drought treatment, frequent low-intensity drying-rewetting cycles enhanced soil Pi turnover, whereas infrequent high-intensity drying-rewetting cycles increased Po turnover and P bioavailability. These findings will inform better water management strategies for desertification restoration in hyper-arid desert ecosystems.</div></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"35 5","pages":"Pages 796-808"},"PeriodicalIF":7.3,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145050672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Changes of nutrients and microbial communities in recovery process of abandoned rare earth tailings","authors":"","doi":"10.1016/j.pedsph.2023.06.007","DOIUrl":"10.1016/j.pedsph.2023.06.007","url":null,"abstract":"<div><p>Rare earth element (REE) mining has wrought severe ecosystem destruction, particularly in the loss of carbon (C), nitrogen (N), and phosphorus (P). Furthermore, its effects on nutrient recovery characteristics and associated microbial abundance are still poorly understood. In this study, an investigation was conducted to determine C, N, and P recovery patterns and microbial communities in abandoned REE mining tailings with different abandoned durations of 1.5 (1.5-Y), 7 (7-Y), 10 (10-Y), and 14 (14-Y) years and at an unmined site (the control group) in Jiangxi Province, China. Longitudinal tailing delamination at each site was investigated in 0–15 (layer 1) and 15–30 (layer 2) cm tailing layers. During the abandoned duration of REE tailings, C and P in layer 1 continued to recover from 1.62 to 8.51 g kg^-1 and from 0.71 to 1.94 g kg^-1, respectively; N losses of 0.60 and 0.22 g kg^-1 occurred at the 1.5-Y and 10-Y sites, while N in layer 1 slightly increased at the 14-Y site. <em>Mesorhizobium</em>, <em>Methylosinus</em>, <em>Bradyrhizobium</em>, <em>Pseudomonas</em>, and <em>Azospirillum</em> were dominant bacteria at the 14-Y site and in the control. The relative abundances of N-fixing bacteria <em>Mesorhizobium</em> (32.94%), <em>Sinorhizobium</em> (0.24%), <em>Frankia</em> (0.71%), and <em>Burkholderia</em> (2.38%) at the 14-Y site were 1.33–3.97 times those in the control (24.19%, 0.18%, 0.32% and 0.60%, respectively), which was helpful for tailing N recovery. At the 14-Y site, <em>Tylospora</em> (50.24%), <em>Luellia</em> (11.02%), <em>Tomentella</em> (6.94%), and <em>Chaetomium</em> (4.34%) were the dominant fungal genera, while <em>Tylospora</em> (56.93%), <em>Suillus</em> (11.45%), and <em>Penicillium</em> (6.78%) predominated in the control. The relative abundance of the P-dissolving fungus <em>Aspergillus</em> at the 14-Y site (0.42%) was 4.2 times that in the control (0.1%), which may lead to the improved tailing P solubility. At the 14-Y site, woody plants such as <em>Pinus massoniana</em> and native pioneering herbs and ferns such as <em>Dicranopteris dichotoma</em> and <em>Nephrolepis auriculata</em> probably invaded from adjacent areas. This study unraveled the natural restoration of plant and microbial communities along with soil nutrient changes in abandoned REE tailings, thus providing a novel insight into ecological recovery and restoration after mining.</p></div>","PeriodicalId":49709,"journal":{"name":"Pedosphere","volume":"34 4","pages":"Pages 826-836"},"PeriodicalIF":5.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43443805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}