沙棘(Hippophae rhamnoides)种植对鄂尔多斯砒砂岩地区土壤容重、孔隙度与贮水能力的影响

Effects of Hippophae rhamnoides Plantation on Soil Bulk Density,Porosity and Moisture Capacity in the Arsenic Sandstone Area of Inner Mongolia

在砒砂岩地区营造沙棘(Hippophae rhamnoides)林可显著缓解该区蓄水能力差和水土流失严重的问题,但其中的机理还不清楚。通过对2~8年生沙棘林下不同深度土壤的容重、孔隙度、持水量等指标观测,探讨了人工栽植沙棘对砒砂岩地区土壤物理性质动态的影响。结果表明:沙棘人工林显著降低了土壤容重,增加了土壤孔隙数量和土壤持水量,而且这种作用随林龄的增加而增加,但随土层深度增加而降低,主要表现在0~10cm土层。可见,在砒砂岩地区营造沙棘人工林有利于改善土壤水分物理状况,原因可能是由于枯落物和根系的作用。

Artifical afforesting seabuckthorn can significantly alleviate problems of poor water storage capacity and soil erosion,but the mechanism is still unclear.In this paper,soil bulk density,soil porosity and soil moisture capacity were observed to explore the effects of 2-8 years old Hippophae rhamnoides on soil physical properties in arsenic sandstone areas.The results showed that:soil bulk density decreased after planting seabuckthorn,soil capacity and soil moisture increased,and this effects increase with the forest age of seabuckthorn,but the soil capacity and soil moisture decreased with soil depth increased,mainly in the 0-10 cm soil layer.In arsenic sandstone area,Artifical afforesting seabuckthorn can improve soil moisture physical conditions,probably due to litter and roots of substrates.