黄土丘陵区退耕地土壤水分有效性及蓄水性能--以陕西省吴旗县柴沟流域为例

对退耕还林还草区具有代表性的乔木(山杏和刺槐)、灌木、农田的土壤水分有效性和蓄水能力进行了测定和对比研究。结果表明,不同植被类型的土壤有效水含量变化范围为1.92%~15.73%,林地比农田增加约75.31%。0—40 cm土层土壤蓄水量为228.30~251.07 t/hm2,林地比农田增加约8%。刺槐林地的蓄水性能好于山杏。研究成果对于科学地评价退耕还林还草的土壤改良效应具有重要的意义。

Soil Water Availability and Soil Water Storage Capacity in Forest or Grass Lands Converted from Farmlands in Loess Hilly and Gully Region--A Case Study of Chaigou Watershed in Wuqi County

Soil water availability and water storage were comparatively studied for the arbor(including Prunus sibirica and Robinia pseudoacacia),shrub and farmlands.It was followed that soil water availability of different vegetation types ranged from 1.92% to 15.73%.In comparison with farmlands,soil water availability on woodlands increased by 75.31%.Total soil water storage within 40cm of the soil surface ranged from 228.30 to 251.07 t/hm~2.In comparison with farmlands,total soil water storage capacity on woodlands increased by about 8%.Total water storage capacity of Robinia pseudoacacia was greater than that of Prunus sibirica.This study was of significance to assess the benefits of soil improvement in the regions of converting farmlands to forest or grass lands.