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林业科学 ›› 2010, Vol. 46 ›› Issue (12): 1-7.doi: 10.11707/j.1001-7488.20101201

• 论文 •    下一篇

黄土丘陵半干旱区柠条锦鸡儿人工林对土壤水分的影响

郭忠升, 邵明安   

  1. 西北农林科技大学 中国科学院水利部水土保持研究所 杨凌712100
  • 收稿日期:2009-05-13 修回日期:2010-08-22 出版日期:2010-12-25 发布日期:2010-12-25

Effect of Artificial Caragana korshinskii Forest on Soil Water in the Semiarid Area of Loess Hilly Region

Guo Zhongsheng, Shao Ming'an   

  1. Northwest A & F University Institute of Soil and Water Conservation,Chinese Academy of Sciences, Ministry of Water Resources Yangling 712100
  • Received:2009-05-13 Revised:2010-08-22 Online:2010-12-25 Published:2010-12-25

摘要:

为了解覆被变化对土壤水分的影响,采用中子水分仪同步定位观测多年撂荒地转变为人工柠条锦鸡儿林地前后2种覆被类型的土壤剖面水分动态变化,并对测定资料进行量化分析。结果表明: 荒地造林后,除丰水年林地剖面土壤含水量和储水量增加,表现为对土壤水分的正效应外,其他年份均表现为对土壤水分的负效应。随林龄增加,柠条锦鸡儿林对土壤水分影响程度逐渐增强,林地土壤含水量和储水量下降幅度加大。由于林地土壤水分主要依靠穿过林冠的天然降水来补充,为了实现森林植被和土壤水资源的可持续发展,防止深层土壤干层形成,造林后第5年就需采取适当措施控制柠条锦鸡儿生长,以减少土壤水分消耗。

关键词: 黄土丘陵半干旱区, 柠条锦鸡儿人工林, 土壤水分, 效应

Abstract:

In order to understand the effect of land cover change from abandoned land to Caragana korshinskii forest land on soil water resources, the dynamics of soil water content with time in the soil layers from 0-400 cm in both of caragana forest land and wasteland was measured simutaneously with neutron probe in fixed positions, and effect of the land cover change on soil water resources was quantitatively analyzed. The results showed that there was a negative effect of the land cover change on soil water resources during the observed years (2002—2006), with the exception year in 2003 in which there was a positive effect of the land cover change on soil water resources because it was a wet year. The influenced degree of the land cover change on the annual averaged soil water content, soil water storage in the soil profile was exacerbated with plant age. The difference of soil water content and soil water storage between the two kinds of land cover type was increased with plant age. Because the precipitation is the only resource of soil water in the semiarid loess region, some proper measures should be taken at the fifth year of C. korshinskii forest to control its growth in order to reduce soil water consumption,prevent deep soil from desiccation and realize the sustainable use of soil water resources and vegetation resources.

Key words: semiarid loess hilly region, land cover change, soil water resources, effect

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