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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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preparation and utilization of phosphate biofertilizers using agricultural waste

引用

Journal of Integrative Agriculture 2015年第1期14卷 158-167页

作者： WANG Hong-yuan LIU Shen ZHAI Li-mei ZHANG Ji-zong REN Tian-zhi FAN Bing-quan LIU Hong-bin Key Laboratory of Nonpoint Source pollution Control Ministry of Agriculture/Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural Sciences

In this study, Aspergillus niger 1107 was isolated and identified as an efficient phosphate-solubilizing fungus （pSF）. This strain generated 689 mg soluble p L-1 NBRIp medium after 10 d of culture. To produce an affordable biofertilizer using A. niger 1107, the potential of widely available carrier materials for growth and maintenance of this strain were evaluated. The effects of sterilization procedures （autoclaving and gamma-ray irradiation） on the suitability of these carriers to maintain growth of the fungus were also investigated. The carrier materials were peat, corn cobs with 20% （w/w） perlite （CCp）, wheat husks with 20% （w/w） perlite （WHp）, and composted cattle manure with 20% （w/w） perlite （CCMp）. In the first 5-6 mon of storage, the carriers sterilized by gamma-ray irradiation maintained higher inoculum loads than those in carriers sterilized by autoclaving. However, this effect was not detectable after 7 mon of storage. For the p-biofertilizer on WHp, more than 2.0× 10^7 viable spores of A. niger g-1 inoculant survived after 7 mon of storage. When this biofertilizer was applied to Chinese cabbage in a pot experiment, there were 5.6×10^6 spores of A. niger g-1 soil before plant harvesting. In the pot experiment, Chinese cabbage plants grown in soil treated with peat- and WHp-based p-biofertilizers showed significantly greater growth （p〈0.05） than that of plants grown in soil treated with free-cell biofertilizer or the CCMp-based biofertilizer. Also, the peat- and WHp-based p-biofertilizers increased the available p content in soil.

关键词： biofertilizer carrier sterilization method phosphate biofertilizer p-solubilizing fungi Aspergillus niger

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