灌溉模式对稻田产量及温室气体排放量影响的定量分析

Quantitative Analysis of Effects of Irrigation Mode on Rice Yieldand Greenhouse Gas Emission

灌溉模式对稻田产量及温室气体排放量具有重要的影响,定量解析不同灌溉模式对稻田产量及温室气体排放量影响,是制定更合理的稻田灌溉策略的理论基础。因此,研究基于稻田淹水层及淹水层下单位深度对应的灌溉当量定义,在考虑降雨的情况下对用水量进行了校正,分析了“长淹”“农民”“好氧”“雨养”等4种灌溉模式在水稻的不同生长阶段用水量与水稻产量及甲烷排放量的相关性。在对上述相关性进行分析的基础上,在搁田期及灌浆期采用逐步降低稻田水位的干模式进行试验,以寻找最佳的稻田控制水位的增产减排灌溉策略。

Irrigation mode has an important impact on rice yield and greenhouse gas emissions.Quantitative analysis of the effects of different irrigation modes on rice yield and greenhouse gas emissions is the theoretical basis for formulating more reasonable irrigation strategies for rice fields.Based on the definition of irrigation equivalent required per unit depth of flooded layer and under flooded layer of paddy field,and considering the correction of available water amount in rainfall zone,the correlation of available water amount with rice yield and CH 4 emission under the different growth and cutoff of rice under the four irrigation modes of long flooding,peasant,aerobic and rain-fed was studied.On the basis of the above correlation analysis,the experiment was carried out by gradually reducing the water level in rice field during the draining and filling periods,so as to find out the best irrigation strategy to control the water level in rice field.