不同降水条件下结皮处理对梭梭林地土壤水分的影响

不同降水条件下对退化人工梭梭林进行恢复试验研究发现,结皮处理可以增加林地水分入渗深度,降低地表径流,提高土壤含水率,对退化梭梭有恢复作用。100%去除结皮、50%带状去除结皮和100%破碎结皮等3种改造措施中,土壤水分储存效果以100%去除结皮处理和50%带状去除结皮处理较好;结皮的存在易造成坡面径流,而结皮处理则阻止了坡面径流的产生,并增加了土壤水分入渗。降水量较小时,水分变化主要集中在0～20 cm土层;降水量较大时,100%去除结皮和50%带状去除结皮处理水分入渗具有明显的加强效果。

Effects of Crust Treatment on Soil Water of Haloxylon ammodendron under Different Precipitation Conditions

Regeneration experiments of degraded artificial Haloxylon ammodendron forest were conducted.It found that crust treatment can be modified to increase the depth of water infiltration in forest land,reduce the run-off,and increase the soil moisture.These effects have regeneration function for degraded Haloxylon ammodendron.In the three regenerated measures,including 100% crust-removed,50% crust-removed,100% broken crust,the optimal effect for soil moisture storge effect is 100% crust-removed and 50% crust-removed;the existence of the crust could easily lead to runoff;the soil crust breaking could prevent runoff and increase soil water infiltration;while precipitation is small,moisture changes mainly in the 0-20 cm soil layer;while precipitation is large,100% crust-removed and 50% crust-removed have significant strengthen effect.