Effects of Green Manure Application and Prolonging Mid-Season Drainage on Greenhouse Gas Emission from Paddy Fields in Ehime, Southwestern Japan
Effects of Green Manure Application and Prolonging Mid-Season Drainage on Greenhouse Gas Emission from Paddy Fields in Ehime, Southwestern Japan
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DOI：
10.3390/agriculture9020029
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发表时间：
2019-02
期刊：
影响因子：
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通讯作者：
Yo Toma;Nukhak Nufita Sari;Koh Akamatsu;Shingo Oomori;O. Nagata;S. Nishimura;B. Purwanto;Hideto Ueno
中科院分区：
文献类型：
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作者：
Yo Toma;Nukhak Nufita Sari;Koh Akamatsu;Shingo Oomori;O. Nagata;S. Nishimura;B. Purwanto;Hideto Ueno
施用绿肥有助于保持土壤肥力、减少化肥使用和土壤固碳。然而，稻田施用有机物会导致CH4 和N2O 排放。延长季中排水可减少稻田的甲烷排放。因此，研究了施用绿肥和延长季中排水对温室气体净排放（NGHGE）的综合影响。在两年的时间内设置了四个实验处理：使用（CMG）和不使用（CM）绿肥的常规季中排水以及使用（PMG）和不使用（PM）绿肥的长期（4或7天）季中排水。秋季播种黄芪种子，并在水稻种植前掺入。各处理之间的年CH4和N2O排放量、异养呼吸和NGHGE没有显着差异，表明施用绿肥和延长季中排水对NGHGE没有影响。在炎热干燥的天气条件下，季中排水期间，PM 和 PMG 中的 CH4 通量急剧下降。然而，增加施用的碳会增加 NGHGE，因为 CH4 和 Rh 会增加。因此，在有机管理稻田中，在不改变NGHGE的情况下，在保持稻田粮食产量的同时，延长中季排水和利用绿肥的组合做法是可以接受的。
Green manure application helps maintain soil fertility, reduce chemical fertilizer use, and carbon sequestration in the soil. Nevertheless, the application of organic matter in paddy fields induces CH4 and N2O emissions. Prolonging mid-season drainage reduces CH4 emissions in paddy fields. Therefore, the combined effects of green manure application and mid-season drainage prolongation on net greenhouse gas emission (NGHGE) were investigated. Four experimental treatments were set up over a 2-year period: conventional mid-season drainage with (CMG) and without (CM) green manure and prolonged (4 or 7 days) mid-season drainage with (PMG) and without (PM) green manure. Astragalus sinicus L. seeds were sown in autumn and incorporated before rice cultivation. No significant difference in annual CH4 and N2O emissions, heterotrophic respiration, and NGHGE between treatments were observed, indicating that green manure application and mid-season drainage prolongation did not influence NGHGE. CH4 flux decreased drastically in PM and PMG during mid-season drainage under the hot and dry weather conditions. However, increasing applied carbon increases NGHGE because of increased CH4 and Rh. Consequently, combination practice of mid-season drainage prolongation and green manure utilization can be acceptable without changing NGHGE while maintaining grain yield in rice paddy fields under organically managed rice paddy fields.