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Changes of nutrients and microbial communities in recovery process of abandoned rare earth tailings

Pedosphere 2024年第4期34卷 826-836页

作者： Bing ZHAnG Junli WU Mengyuan HUAnG Yan ZHAnG Jin ZHAO Chuntao HE Zhongyi YAnG School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510006China School of Life Sciences Sun Yat-sen UniversityGuangzhou 510275China School of Agriculture State Key Laboratory for BiocontrolShenzhen Campus of Sun Yat-sen UniversitySun Yat-sen UniversityShenzhen 518107China

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 *** 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,*** tailing delamination at each site was investigated in 0–15(layer 1)and 15–30(layer 2)cm tailing *** 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 ***,Methylosinus,Bradyrhizobium,Pseudomonas,and Azospirillum were dominant bacteria at the 14-Y site and in the *** relative abundances of n-fixing bacteria Mesorhizobium(32.94%),Sinorhizobium(0.24%),Frankia(0.71%),and Burkholderia(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 *** the 14-Y site,Tylospora(50.24%),Luellia(11.02%),Tomentella(6.94%),and Chaetomium(4.34%)were the dominant fungal genera,while Tylospora(56.93%),Suillus(11.45%),and Penicillium(6.78%)predominated in the *** relative abundance of the P-dissolving fungus Aspergillus 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 *** the 14-Y site,woody plants such as Pinus massoniana and native pioneering herbs and ferns such as Dicranopteris dichotoma and nephrolepis auriculata probably invaded from adjacent *** study unraveled the natural restoration of plant and micro

关键词： abandoned duration mining tailing n-fixing bacteria nutrient recovery P-solubilizing fungi rare earth element

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Organic manure input and straw cover improved the community structure of nitrogen cycle function microorganism driven by water erosion

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International Soil and Water Conservation Research 2022年第1期10卷 129-142页

作者： Yulong Shi Qingwen Zhang Xingren Liu Xuekai Jing Chang Shi Li Zheng Agricultural Clean Watershed Resewarch Group Institute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural SciencesBeijing100081China

Water erosion process induces differences to the nitrogen(n)functional microbial community structure,which is the driving force to key n processes at soil-water ***,how the soil n trans-formations associated with water erosion is affected by microorganisms,and how the microbial respond,are still *** objective of this study is to investigate the changes of microbial diversity and community structure of the n-cycle function microorganisms as affected by water erosion under application of organic manure and straw *** the basis of iso-nitrogen substitution,four treatments were set up:1)only chemical fertilizer with n 150 kg ha^(-1),P2O560 kg ha^(-1) and K2O 90 kg ha^(-1)(CK);the n was substituted 20%by 2)organic manure(OM);3)straw(SW);and 4)organic manure+straw(1:1)(OMSW).The results showed that applying organic manure and straw to sloping farmland can increase soil n contents,but reduce runoff depth,Kw,sediment yield and n loss,especially in the *** cover and straw+organic manure increased the diversity(Chao1)of nitrifier(AOB),and both diversity and uniformity(Shannon)of denitrifier(nirK/S)were increased in the *** erosion control mea-sures reduced n-fixing bacteria diversity and increased their uniformity,and the combined application of organic manure and straw cover was a better erosion control measure than the single application of *** soil chemistry and erodibility were the main drives for the changes of n-functional microbial community structure and the appearance of dominant bacteria with different organic materials.

关键词： Water erosion Soil erodibility Organic amendment nitrifier Denitrifier n-fixing bacteria

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