论文部分内容阅读
通过Hydrus-3D模型计算不同秋浇定额对土壤水盐变化的影响,研究适合新疆生产建设兵团石河子121团的秋浇定额。结果表明,较大的秋浇定额会产生较大的底层水分通量,造成地下水位升高。受到冻融作用的影响,在冻融期土壤水分过大也会加剧盐分的集聚,秋浇定额应尽可能的小。同时较大的秋浇定额,将会使土壤盐分淋洗的更为充分,给春季种子的萌发提供较好条件,秋浇定额应尽可能的大。当秋浇定额为2 250m~3/hm~2时,脱盐率达到55.71%,0~60cm土层含盐率仅为0.127%~0.481%,能较好的满足棉花春季播种的需求。
Hydrus-3D model was used to calculate the influence of different autumn irrigation quotas on the changes of soil water and salt, and to study the autumn irrigation quotas suitable for Xinjiang Production and Construction Corps Shihezi 121 regiment. The results show that a larger fall irrigation quota will have a larger underlying water flux, resulting in elevated groundwater levels. Affected by the effects of freeze-thaw, soil moisture in the freeze-thaw period will also exacerbate the accumulation of salt, autumn irrigation quota should be as small as possible. In the meantime, a larger fall irrigation quota will make the soil salt rinse more fully and provide better conditions for spring seed germination. The fall irrigation quota should be as large as possible. The desalination rate reached 55.71% and the salt rate in 0 ~ 60cm soil layer was only 0.127% ~ 0.481% when the autumn irrigation quota was 2 250m ~ 3 / hm ~ 2, which could better meet the demand of cotton sowing in spring.