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Continuous milk vetch amendment in rice-fallow rotation improves soil fertility and maintains rice yield without increasing CH4 emissions: Evidence from a long-term experiment

文献类型： 外文期刊

作者： Hou, Pengfu 1 ; Xue, Lixiang 1 ; Wang, Jing 2 ; Petropoulos, Evangelos 3 ; Deng, Xuzhe 4 ; Qiao, Jun 5 ; Xue, Lihong 1 ; Yang, Linzhang 1 ;

作者机构： 1.Minist Agr & Rural Affairs China, Key Lab Agroenvironm Downstream Yangze Plain, Jiangsu Acad Agr Sci, Nanjing 210014, Peoples R China

2.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

3.Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

4.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212001, Jiangsu, Peoples R China

5.Chinese Acad Sci, Inst Soil Sci, Nanjing 210014, Peoples R China

关键词： Methane emissions; Milk vetch; Ryegrass; Methanogens; Climate change; Food security

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.576； 五年影响因子：7.088 ）

ISSN： 0167-8809

年卷期： 2022 年 325 卷

页码：

收录情况： SCI

摘要： Catch crop (green manure) planting is considered an efficient strategy to improve soil fertility in agro-ecosystems. Methane (CH4) emissions from paddies subjected to continuous green manure amendment though is a topic that remains unexplored. To clarify the impact of continuous green manure amendment on rice yield and CH4 emissions, a long-term trial (established in 2003, Yixing, China) was designed with the field observations conducted between 2019 and 2020. Two green manure crops (milk vetch, ryegrass) were selected as the catch crop with fallow as the control, all trialed at two N application rates i) low N dosage deriving from the optimum effect between yield-N fertilizer (LN, 200 kg ha(-1)), and ii) a higher N dose as the empirical farmer's dose (HN, 270 kg ha(-1)). The results showed that continuous green manure amendment notably increased soil organic carbon (SOC) compared to that of the control, while HN significantly increased the dissolved organic nitrogen compared to LN. The rice yield among treatments remained similar, ranging from 8.6 t ha(-1) to 9.4 t ha(-1) (two years' average). CH4 emissions were notably related to green manure, and remained unaffected by N application rate. Ryegrass amendment after 18 years remarkably stimulated the CH4 emissions compared to other treatments, while the difference between milk vetch-amended and fallow treatments was found insignificant. Ryegrass increased soil mcrA gene with the abundance becoming the highest under HN. Methanogens abundance and SOC content were the main factors affecting CH4 emissions under ryegrass addition. Moreover, the CH4 emission intensity was aligned with CH4 emissions mainly due to the similar rice yield. Overall, continuous milk vetch planting is a recommended catch crop strategy that increases soil fertility and maintains rice yield without increasing CH4 emissions.

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