| Dynamic law of soil water during vegetation growing season in alpine stipa steppe |
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| DOI：10.7606/j.issn.1000-7601.2009.03.18 |
| Key Words: Northwest stipa steppe vegetation growing season soil water temporal variation vertical distribution |
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| Abstract: |
| By using the soil water observational data(0～50 cm) from 1999 to 2007 in Xinghai stockbreeding meteorological station in Qinghai Province,the variations(interannual,monthly and ten-day's) and vertical distribution of soil water during vegetation growing season in the alpine stipa steppe were analyzed.The results show that: the interannual variation of soil water was obvious with multi-variations character and had a significant correlation with annual precipitation.The monthly change curves of soil water during vegetation growing season was "M" shape,and the whole growing season could be divided into five different periods,named slow increase in spring,fast increase between spring and summer, fast decrease in summer,fast increase in autumn,fast decrease in the end of autumn,respectively.The soil water in the 20～30 cm layer was the largest,and for the vertical distribution of soil water,the 0～10 cm layer varied frequently,while the 10～50 cm layer varied slowly.Based on the character of roots' utilization of soil water,soil layers were divided into roots' utilization layer and root's micro-utilization layer.According to the variation coefficient,the monthly change of soil water virtual distribution in rainy season was larger than in dry season. |
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