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| Effects of the application rate of non-hazardous composted sewage sludge on soil active organic carbon fractions of sandy fluvo-aquic soil |
| Received:July 04, 2017 |
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| KeyWord:non-hazardous composted sewage sludge;sandy fluvo-aquic soil;soil fertility;fertility factors;soil active organic carbon |
| Author Name | Affiliation | E-mail | | GUO Kang-li | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | | | JI Zheng-yu | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | | | LIU Xiao | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | | | ZHU Xing-juan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | JIANG Hui-min | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | | | YANG Jun-cheng | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | | | LI Gui-hua | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | liguihua@caas.cn | | ZHANG Jian-feng | National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agriculture Science, Beijing 100081, China | zhangjianfeng@caas.cn |
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| Abstract: |
| Non-hazardous composted sewage sludge(SW) originates from the treatment of sewage sludge and is utilized in accordance with the Control Standard of Pollutants in Agricultural Sludge(GB/T 24600-2009 China) for non-hazardous materials. This study focused on the effects of the continuous application of SW on the concentration and distribution of active organic carbon in sandy fluvo-aquic soil under a wheat-maize rotation system during 2013-2016 in Henan Province, China. Four treatments were designed as follows:applying chemical fertilizers only(CK), 15 t·hm-2 SW(SW1), CK+30 t·hm-2 SW(SW2), and CK+45 t·hm-2 SW(SW3). The results showed that SW could significantly increase soil organic carbon(SOC), total nitrogen(TN) and soil integrated fertility index(IFI)(P<0.05). The SW3 treatment significantly increased SOC, TN, and IFI by 265.83%, 284.31%, and 55.51%(P<0.05). The SW application could significantly increase soil active organic carbon fractions in an amount-dependent manner in the following order:particulate organic carbon(POC) > light fraction organic carbon(LFOC) > dissolved organic carbon(DOC) > microbial biomass carbon(SMBC). The SW application could enhance the SMBC/SOC ratio, particularly the SW3 treatment, which promoted the SMBC/SOC ratio by 256.84%(P<0.05) compared with the CK treatment. However, the SW application decreased the distribution of LFOC/SOC, POC/SOC, and DOC/SOC, which indicated that SW promoted soil carbon conserved in the form of stable organic matter fractions. Consistent with the above results, the principle component analysis results showed that the influence on soil active organic carbon fractions and its distribution was dependent on the SW application amount. Redundancy analysis further revealed that soil fertility, soil available nutrients, pH and soil moisture were closely related to the content of soil active organic carbon fractions and its distribution. IFI was the most significant factor influencing soil active organic carbon fractions(P<0.05), and it could explain 64.3% of the variation through the redundancy analysis. In summary, the four years of SW application, particularly the 45 t·hm-2 non-hazardous composted sewage sludge treatment, could significantly increase soil fertility and the content of active organic carbon, and improve the soil quality. |
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