黄土高原土壤干层减缓方法初探

针对黄土高原长期种植苜蓿会导致深层土壤的干层化现象，在陕北黄土丘陵沟壑区的苜蓿种植区采用侧膜种植、播量减半种植、间作种植、常规种植4种种植模式来分析土壤水分环境。研究表明：侧膜种植年内贮水量在各个时期较其它3种模式高，各种植模式有效降雨量与土壤水分补给量之间关系呈线性相关，侧膜种植提高0～180cm土层土壤水分补给量更为突出。有效降雨对4种种植模式活跃层的贮水补偿作用极显著。春夏失墒期各种模式土壤相对稳定层对活跃层的补偿作用显著，各处理的相对稳定对活跃层补给量之间呈直线正相关，但补给量存在一定差异。

Preliminary Research on Countermeasures of Desiccation of Deep Soil Layer in Loess Plateau

Alfalfa is often planted perennially in the Loess Plateau,which leads to the desiccation of deep soil layer.So,alfalfa is planted with four different patterns to lessen the formation of dried soil layer,which includes the halve sowing establishment,the intercrop establishment,the plastic film mulching establishment and the check establishment.The main results showed: the water storage of the plastic film mulching establishment was higher than the other three establishments in any time of the year.There is a very significant linear dependence between the available rainfall and replenishment of the soil water.The replenishment of plastic film mulching establishment is more obviously than the othr three establishments.The available rainfall replenish the active layer significantly.During the transition from spring to summer,the stable layer replenish the active layer significantly.There is a very significant linear dependence between the replenishment of stable layer and active layer of four establishments,but replenishments are different.