水分胁迫条件下绿洲农田冬小麦水分运移规律研究

以干旱区绿洲农田冬小麦水分胁迫试验为基础,研究了不同水分胁迫条件下的冬小麦生长发育、水分利用以及土壤水分运动特征,建立了含有根系吸水项的一维土壤水动力学模型,模拟了不同水分胁迫条件下冬小麦蒸腾、棵间蒸发、根系吸水、根系生长以及田间土壤水分运移过程。结果表明:在冬小麦生育前期、中期根系吸水主要在80cm以上,生育后期根系对下层土壤水分吸收量增加,但所占比例很小。根据实测根系生长资料分析水分胁迫下生育中期根系受到水分胁迫,在生育后期恢复灌水后根系早衰,生长缓慢;从胁迫程度上来说中度胁迫复水后的后效影响要大于重度胁迫处理。

Soil Water Movement Law of Winter Wheat under Water Stress Condition in Oasis Field

Based on the water stress field experiment of water wheat in arid region, the growth of winter wheat, water using and the character of soil water movement were investigated, and one-dimension soil water model containing root water uptake was presented in this paper. The model was used to simulate transpiration, evaporation, root, water uptake and water movement of soil water under different water stress condition .The result indicate that at development prophase of winter wheat the depth of root water uptake is up 80 cm, and that the valum of root water uptake which is a small proportion of whole root water uptake increased at under layer. The analysis based on the growth data measured of root show that the root under water stress condition during metaphase of growth stage premature senility and grow slowly after rewatering at anaphase of growth stage, and the effect of moderate water stress is more than water stress weightily after rewatering.