论文部分内容阅读
为探明土壤水对旱地作物产量形成的有效性,通过田间定位试验研究了不同耕作措施下旱地农田蒸发蒸腾特性及产量效应。结果表明:免耕秸秆覆盖(NTS)能够增加作物生长期间总蒸散量(ET),麦-豆和豆-麦两种轮作序列下春小麦田和豌豆田的总蒸散量均表现为免耕秸秆覆盖(NTS)>传统耕作(T)>免耕(NT)>传统耕作加秸秆覆盖(TS)。传统耕作土壤棵间蒸发量(E)均高于保护性耕作,春小麦田的土壤棵间蒸发量表现为TS>T>NT>NTS,棵间蒸发量占总蒸散量的比率(E/ET)依次为53.8%,48.8%,37.2%,34.9%;豌豆田棵间蒸发量表现为T>TS>NTS>NT,棵间蒸发量占总蒸散量的比率依次为44.1%,40.9%,35.1%,33.3%。蒸散量及腾发比与产量和WUE在其主要受影响的月份呈正相关关系,且产量与WUE随蒸散量与腾发比的增加而增加。
In order to find out the effectiveness of soil water on crop yield formation in dryland, field experiments were conducted to study the transpiration characteristics and yield effects of dryland farmland under different tillage practices. The results showed that no-tillage straw mulching (NTS) increased the total evapotranspiration (ET) during crop growth. The total evapotranspiration of spring wheat and pea fields under both wheat-bean and bean-wheat rotation sequences showed no-tillage straw mulching (NT)> Conventional farming (T)> No-till (NT)> Conventional farming plus straw mulching (TS). The Evapotranspiration (E) of the soil was higher than that of the conservation tillage. The soil transpiration under the spring wheat field was TS> T> NT> NTS, and the ratio of inter-tree evaporation to total evapotranspiration (E / ET) The percentage of evapotranspiration to total evapotranspiration was 44.1%, 40.9% and 35.1%, respectively, in the order of T> TS> NTS> NT. , 33.3%. Evapotranspiration and Evapotranspiration have a positive correlation with yield and WUE in the main affected months, and the yield and WUE increase with the increase of Evapotranspiration and Evapotranspiration.