太行山前平原高产农区土壤水分特征及农田节水潜力

Dynamics of soil water content and potentials of water-saving in the farmland of Taihand Piedmont

根据连续4年对非耕地和田间土壤水分的测定,分析了太行山前平原高产农区土壤水分的变化规律,并根据该区主要作物冬小麦和夏玉米的需水规律,提出了农田节水潜力的两个方面。

Based on four years' investigations the dynamics and patterns of soil moisture in the farmland of Taihang Piedmont were analysed.The soil moisture of top layer was greatly affected by water supply,while in deep layer of the soil, soil water content was keeped at relatively steady statues.Then by increasing crop root growth to increase water uptake from the deep layer of soil would reduce the water stress effects on crop and also the irrigation numbers.Another aspect for reducing irrigation was to reduce soil evaporation from the farmland.During the growth periods of winter wheat and corn there were about total 200mm e-vaporation from the soil surface.According to our experiments here, straw mulch could reduce this value to 100mm.So this was another effective way for increasing the water use efficiency in the farmland.