Moisture and Vegetation Reconstruction in Sandy Lands of Jingbian County in Shaanxi Province

LUO Xiao-qing; ZHAO Jing-bo

doi:10.13961/j.cnki.stbctb.2014.06.058

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Moisture and Vegetation Reconstruction in Sandy Lands of Jingbian County in Shaanxi Province

- Moisture and Vegetation Reconstruction in Sandy Lands of Jingbian County in Shaanxi Province
- Bulletin of Soiland Water Conservation Vol. 33, Issue 6, Pages: 299-304(2014)
- 作者机构：
  
  1. 陕西师范大学旅游与环境学院,陕西,西安,710062
  2. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西,西安,710075
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.06.058
  CLC：
- Published：2014
- 稿件说明：
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LUO Xiao-qing, ZHAO Jing-bo. Moisture and Vegetation Reconstruction in Sandy Lands of Jingbian County in Shaanxi Province[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 299-304.
DOI：

LUO Xiao-qing, ZHAO Jing-bo. Moisture and Vegetation Reconstruction in Sandy Lands of Jingbian County in Shaanxi Province[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 299-304. DOI： 10.13961/j.cnki.stbctb.2014.06.058.

摘要

根据毛乌素沙地靖边县海则滩镇钻孔剖面沙层水分含量的测定

研究了该区沙地剖面水分分布特点、沙层水分存在形式、水分平衡、大气降水对地下水的补给以及植被建设等问题。结果表明

该区500 cm深度范围内沙层剖面含水量的变化特点是草地0-200 cm和灌木林地0-300 cm含水量较低

草地200-500 cm和灌木林地300-500 cm含水量较高;草地沙层含水量明显高于灌木林地

草地含水量变化范围为1.0%~6.0%

平均为3.4%;灌木地含水量变化范围为0.7%~2.8%

平均为1.5%。草地沙层剖面200 cm以下有含量大于3%的高含量薄膜水和含量大于5%的重力水存在

显示大气降水对地下水的补给较强。灌木林地沙层中一般缺少重力水和高含量薄膜水

指示灌木林地降水对地下水补给较弱。该区水分为正平衡

其原因除了降水较多之外

沙层入渗率高和受蒸发消耗较少也是重要原因。由于靖边县沙地区降水量较多

沙地水分活跃层分布深度在200~300 cm之间

较沙漠区分布深度增加了100-200 cm。沙层水分含量的剖面变化表明

该区沙层水分能够满足耐旱灌木林生长的需要

适于发展防风固沙效果好的灌木林。

Abstract

According to moisture content in sand layers of the drilling sections in Haizetan Town of Jingbian County of Shaanxi Province

Mu Us sandy grassland

we studied the characteristics of moisture distribution in sandy lands

existing forms

water balance

supply of atmospheric precipitation to groundwater and appropriate vegetation. The result showed that variation of moisture within the depth of 500 cm was that the upper part contained less water and the lower contained more. The moisture content were found also high both below the depth of 200 cm in grassland and below the depth of 300 cm in shrub land. Sand moisture in grassland was significantly higher than that in shrub land. The moisture content of grassland ranged from 1.0% to 6.0%

with an average of 3.4%

and that of shrub land was 0.7% to 2.8% with an average of 1.5%. There were film water exceeding 3% and gravity water exceeding 5% below 200 cm on the sand section in grassland

which indicated the obvious supply of precipitation to groundwater. While the sand layers in shrub land was usually lacking of gravity water and high content of film water

it suggested that supply of atmospheric precipitation to groundwater was actually weak in the area. The important reasons why this area has positive water balance were high infiltration rate and small evaporation effect of sand layers

in addition to more precipitation. Owing to much rainfall in sandy lands of Jingbian County

active layer of sand moisture distributed at the depth of 200-300 cm

which was 100 cm to 200 cm deeper than that of desert area. Variation of moisture in the sand layers showed that sand moisture in the area could meet the needs for the growth of drought-resistant shrub

which was suitable for the development of shrub with good sand-fixing effect.

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