Soil Moisture Dynamic Variation Law of Typical Shrub-grass Vegetation in Loess Hill Area of Northwestern Shanxi

JIA Zhi qing

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Soil Moisture Dynamic Variation Law of Typical Shrub-grass Vegetation in Loess Hill Area of Northwestern Shanxi

- Soil Moisture Dynamic Variation Law of Typical Shrub-grass Vegetation in Loess Hill Area of Northwestern Shanxi
- Bulletin of Soiland Water Conservation Vol. 25, Issue 1, Pages: 10-15(2006)
- 作者机构：
  
  中国林业科学研究院林业研究所,北京,100091
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- Published：2006
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JIA Zhi qing. Soil Moisture Dynamic Variation Law of Typical Shrub-grass Vegetation in Loess Hill Area of Northwestern Shanxi[J]. Bulletin of Soiland Water Conservation, 2006, 25(1): 10-15.
DOI：

JIA Zhi qing. Soil Moisture Dynamic Variation Law of Typical Shrub-grass Vegetation in Loess Hill Area of Northwestern Shanxi[J]. Bulletin of Soiland Water Conservation, 2006, 25(1): 10-15. DOI：

摘要

以晋西北黄土丘陵沟壑区为背景

以当地适生灌草种(柠条、沙棘、紫花苜蓿等)为主要研究对象

通过野外定位定点观测

应用谐波分析理论

系统地对林草地及封育区与非封育区灌木土壤水分动态变化规律进行了分析。研究结果表明:研究地区典型灌草植被土壤水分年内变化受降雨和蒸发散的影响

可明显地划分为干湿两季和土壤水分变化的4个阶段;通过标准差和变异系数将土壤水分垂直层次划分为速变层、活跃层和次活跃层

且土壤水分层次剖面与降雨年型有关。通过分析土壤水分动态变化规律

提出灌草地、灌木林地调节土壤水分的功能优于草地、农地和荒坡地

封育区灌木植被的土壤水分状况优于非封育区等结论。上述研究成果将为同类地区植被恢复与生态工程建设提供重要的理论依据。

Abstract

The suitable shrub-grass plants of Caragana korshinskii Kom.

Hippophae rhamnoides L.

Medicago sativa L.are the main research object.Soil moisture dynamic variation law of shrub-grass lands and the shrub in the closing area were studied by means of located observation and the harmonic analysis.Results show that the annual variation of soil moisture of the typical shrub-grass vegetation in the area affected by the annual variation of rainfall and evaportranspiration is remarkably divided into the arid and humid seasons

and four periods of soil moisture variation.The soil moisture profile is divided into the rapid change layer

the active layer and the second active layer by the two indexes of standard deviation and variation coefficient

and the relation of soil moisture profile with the precipitation in the same period is analysed.The adjusting function to soil moisture of shrub-grass lands

shrub forestlands is better than grasslands

farmlands and bare-lands

and the soil moisture condition of shrub in the closing area is better.The research results are important to the vegetation recovery and ecological engineering construction in a similar region.

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