不同降水条件下结皮处理对梭梭林地土壤水分的影响

摘要

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。%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.