Film mulching短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 地膜覆盖 Irrigation reduces both the decline degree under plastic film mulching treatment, and the increase degree in straw mulching treatment of soil organic carbon during the growth periods of spring wheat. 灌溉同时降低了春小麦地膜覆盖处理土壤有机碳的降低幅度和秸秆覆盖处理土壤有机碳的增加幅度； doi.wanfangdata.com.cn