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| Response of N2O emissions from Hainan red soil to different carbon sources under different moisture conditions |
| Received:June 25, 2021 |
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| KeyWord:biochar;straw;soil N2O emission;soil moisture;nitrification |
| Author Name | Affiliation | E-mail | | ZHU Qilin | Agriculture and Rural Affairs Bureau of Sanya City Hainan Province, Sanya 572000, China
College of Tropical Crops, Hainan University, Haikou 570228, China | | | LIU Lijun | College of Tropical Crops, Hainan University, Haikou 570228, China | | | HE Qiuxiang | College of Tropical Crops, Hainan University, Haikou 570228, China | | | LIU Jinxia | College of Tropical Crops, Hainan University, Haikou 570228, China | | | CAO Ming | Agriculture and Rural Affairs Bureau of Sanya City Hainan Province, Sanya 572000, China | | | WU Yanzheng | College of Tropical Crops, Hainan University, Haikou 570228, China | | | TANG Shuirong | College of Tropical Crops, Hainan University, Haikou 570228, China | | | MENG Lei | College of Tropical Crops, Hainan University, Haikou 570228, China | | | KE Yongchun | Agriculture and Rural Affairs Bureau of Sanya City Hainan Province, Sanya 572000, China | key1318119@163.com |
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| Abstract: |
| To explore the response of soil N2O emission to carbon sources addition under different water conditions, two biochar treatments B1 and B2 were set up（B1：the amount of biochar added was 1% of the soil mass, B2：the amount of biochar added was 2% of the soil mass）, straw treatment S（the amount of rice straw added was 2.75% of the soil mass, and the amount of straw was equivalent to that of B1） and 3 moisture conditions were set at the same time. In addition, a control treatment with no added soil, as the blank treatment（CK）, was set up. Each treatment was cultivated for 25 d under the conditions of 45% of the maximum soil water holding capacity W1（simulated drought）, 75% of the maximum soil water holding capacity W2（moderate）, and 100% of the maximum soil water holding capacity W3 （flooding）. Results showed that the level of NH+ 4-N content in soil under different water conditions was in this order：W1>W2>W3, and the level of NO3--N content was in this order：W3>W2>W1. Soil moisture significantly affected N2O emissions. Compared with W1, the cumulative N2O emissions of CK treatment under W2 and W3 moistures increased by 806.2% and 798.6%, respectively; S increased by 455.8% and 315.3%, respectively; and B1 treatments increased by 713.2% and 801.6%，B2 treatments increased by 311.3% and 661.7%,respectively. Under the water conditions of W1 and W2, the addition of straw（S）significantly increased the cumulative emission of soil N2O compared with CK by 80.9% and 10.9%, respectively. The addition of biochar（B1, B2）reduced the cumulative emission of soil N2O under all moisture conditions. The higher the moisture content, the greater the reduction in soil N2O emission. The decrease in B1 and B2 was 25.7%~33.5% and 22.9%~65.0%, respectively. The results of this study show that the addition of biochar to Hainan red soil can reduce soil N2O emissions; however, straw returning to the field can increase soil N2O emissions when the water holding capacity is less than 75%, and can reduce soil N2O emissions under flooding conditions. |
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