旱稻农田土壤水分变化特征研究

Soil water characteristics of farmland of aerobic rice

试验研究旱稻不同灌溉处理土壤水分变化特征结果表明,不同供水条件下农田土壤水分变化的主要层次均为80cm以上,120cm以下土层土壤水分处于相对稳定状态,且维持在相对较高水平;供水较多时旱稻水分耗散量、耗水强度也较大,而相同供水条件下旱稻水分耗散量和耗水强度又小于水稻对照;相同灌溉处理旱稻产量和水分利用效率均高于水稻对照;而充足供水有利于旱稻根系在0～20cm表层发育,但不利于其根系在下层生长,而W2可促使根系下扎,更充分利用下层水分.

The characteristics of soil water content of farmland of aerobic rice under different irrigation treatments are analyzed.The results show that the changes of soil water content of farmland mostly are under 80cm soil layer with different water supply treatments,soil water content is stable under 120cm soil layer and keeps relatively higher;the more the water supply is,the more the water expends and the higher the water rate of aerobic rice is,but in the same level of water supply,the amount of water dissipation of lowland rice is higher than that of aerobic rice;under the same irrigation treatment,the yield and water use efficiency of aerobic rice are higher than those of lowland rice,abundant water irrigation is propitious to the development of root of aerobic rice in 0～20cm soil surface layer,but is not propitious to the development of root in soil under the depth,but the water stress urges the root to develop in soil under the layer so as to use the soil water sufficiently.