| Effects of multiple cropping of green manure after wheat on soil organic carbon and its sequestration characteristics |
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| DOI：10.7606/j.issn.1000-7601.2021.04.19 |
| Key Words: green manure organic carbon soil aggregate organic carbon enrichment factor contribution rate |
| Author Name | Affiliation | | BAI Lu | Academy of Agriculture and Forestry，Qinghai University, Xining 810016, China | | JIANG Fuzhen | Academy of Agriculture and Forestry，Qinghai University, Xining 810016, China | | CAO Weidong | Institute of Agricultural Resources and Division，Chinese Academy of Agriculture Sciences, Beijing 100081, China | | LI Zhengpeng | Academy of Agriculture and Forestry，Qinghai University, Xining 810016, China | | YAN Qingbiao | Academy of Agriculture and Forestry，Qinghai University, Xining 810016, China | | HAN Mei | Academy of Agriculture and Forestry，Qinghai University, Xining 810016, China |
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| Abstract: |
| The effects of intercropping Viciavillosa with green manure after wheat on the distribution and fixation of soil organic carbon in Qinghai Plateau were studied. The effects of multiple cropping of Viciavillosa on soil organic carbon, soil aggregate, organic carbon content, distribution, enrichment coefficient and contribution rate were analyzed. The results showed that the content of soil organic carbon changed with the growth period of wheat, and the content of soil organic carbon increased significantly after multiple cropping of Viciavillosa, The content of soil organic carbon increased by 11.3% at the initial flowering stage; The content of organic carbon and the distribution of water stable aggregates were affected by the combination of vetch and chemical fertilizer, With the increase of particle size, the proportion of >5 mm particle size was the largest, and the carbon content of F70+G treatment was the highest, which increased from 16.17 g·kg-1 to 17.35 g·kg-1 at initial flowering stage; The enrichment factors of organic carbon content of aggregates in all treatments ranged from 0.83 to 1.58, and increased with the decrease of particle size, In the 1~3 mm grain size fraction, except for F100 treatment in turn over stage, the enrichment factors of other treatments were all greater than 1, and 8 was in the preferential accumulation state.The contribution rate of >0.5 mm particle size is the largest, accounting for more than 80%,Among them, the contribution rate of >5 mm was the largest, while that of 1~3 mm was the smallest.Soil organic carbon content,aggregate organic carboncontent and enrichment factor increased after multiple cropping of Viciavillosa. At the same time, it promotes the distribution and fixation of organic carbon in water stable aggregates. |
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