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| Response of the active carbon pool and enzymatic activity of soils to maize straw returning |
| Received:December 15, 2017 |
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| KeyWord:straw application;soil active carbon pool;carbon pool management index;soil enzyme activities;spring maize yield |
| Author Name | Affiliation | E-mail | | HE Mei | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Li-gang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | wangligang@caas.cn | | WANG Ying-chun | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHU Ping | Institute of Agricultural Resources and Environment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China | | | LI Qiang | Institute of Agricultural Resources and Environment Research, Jilin Academy of Agricultural Sciences, Changchun 130033, China | | | SHEN Xin | The National Agro-Tech Extension and Service Center, Beijing 100125, China | |
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| Abstract: |
| Straw returning is important for enhancing soil fertility and controlling air pollution. Understanding the effects of straw returning on the active carbon pool and enzymatic activities of soils can help the design of better straw returning management strategies. In this study, we set up five treatments with different fertilization and straw returning strategies, including the use of no fertilizers (CK), NPK fertilizer (NPK), fertilizer with 1/3 biomass of straw returned (NPKS1), fertilizer with 1/2 biomass of straw returned (NPKS2), and fertilizer with total straw returned (NPKS3). Then the effects of the different treatments on the active carbon pool, carbon management index, and enzyme activity of soils, and the yields of spring corn were analyzed. The results showed that the contents of dissolved organic carbon (DOC), microbial biomass carbon (MBC), particulate organic carbon (POC), and readily oxidized organic carbon (ROC) obviously improved after straw returning, and the more the straw returned, the higher were the increases. The soil carbon management indices significantly differed among the treatments with different amounts of straw returned, and compared to that of NPK, the carbon pool management index of NPKS1, NPKS2 and NPKS3 increased by 52.83%, 86.92%, and 114.76%, respectively. Furthermore, straw returning increased β-xylosidase (BXYL), cellulose (CBH), acetyl beta glucosamine enzyme (NAG), and beta glycosidase enzyme (BG) activities by varying degrees. Compared with NPK, the DOC and POC contents, soil carbon pool activity, soil carbon pool activity index, soil carbon pool management index, and soil CBH, BG, and BXYL enzyme activities of NPKS2 and NPKS3 were significantly improved (P<0.05). The yields of spring corn increased after straw returning, but the differences in yields were not significant among the three straw returning treatments. To sum up, maize straw returning at the rate of 4500~9000 kg·hm-2 is appropriate for this test area. |
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