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| DOI：10.13522/j.cnki.ggps.2021566 |
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| Effects of Anaerobic Sludge on Remediation of Sandy Soil and Biomass of Alfalfa |
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XU Jianqing, CHEN Zhouzhou, LIU Pengyu, CHEN Daijie, TAN Jun, WU Yuansheng, CHENG Yue, CHU Xiaohe
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1. Zhejiang University of Technology, Hangzhou 310014, China; 2. Shanghai Jiaotong University, Shanghai 200240, China;
3. Shanghai Institute of Pharmaceutical Industry, Shanghai 201203, China;
4. Chifeng Anbang Industrial Waste Disposal Co., Ltd, Chifeng 024000, China;
5. Zhejiang Lvchuang Biotechnology Co., Ltd, Huzhou 313299, China
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| Abstract: |
| 【Objective】In order to investigate the improvement effects of anaerobic sludge on water leakage and fertilizer leakage, nutrient imbalance, single microbial community structure and crop biomass decline of sandy soil.【Method】Four treatments were set up in this study, including no anaerobic sludge (CK), low anaerobic sludge application (A1), medium anaerobic sludge application (A2) and high anaerobic sludge application (A3), then explore the effects of anaerobic sludge on soil water storage capacity, soil nutrient status, soil microbial community structure and alfalfa biomass of sandy land with a thickness of 0~20 cm through field experiments.【Result】①compared with the group CK without anaerobic sludge, the application of anaerobic sludge has a strong improvement effect on sandy soil, and the group A3 with high anaerobic sludge application amount of 30 t/hm2 has the best improvement effect: the improvement of soil water storage reaches 32.26% (30 d), 25.3% (60 d) and 22.39% (90 d); ②in the initial stage of anaerobic sludge application, compared with the group CK, the content of soil organic matter in the group A3 increases by 139.38%, the content of soil total nitrogen and available nitrogen increases by 177.73% and 159.75%, the content of soil total phosphorus and available phosphorus increases by 111.64% and 1 062.75%, the content of soil total potassium and available potassium increases by 66.07% and 572.82% respectively; ③compared with the group CK, the soil urease activity and sucrase activity of the group A3 increase by 96.96% and 375.11%; ④compared with the group CK, the fresh weight and dry weight of alfalfa in the group A3 increase by 183.97% (90 d) and 180.98% (90 d).【Conclusion】It indicates that anaerobic sludge can significantly improve soil water storage capacity, increase soil nutrients, improve soil microbial species richness, increase soil enzyme activity, promote alfalfa growth and increase alfalfa biomass, furthermore, and with the increase of anaerobic sludge application, the improvement effects become more obvious. |
| Key words: anaerobic sludge; sandy soil improvement; soil water storage capacity; soil nutrients; alfalfa |
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