| Influence of meteorological factors on the dynamic changes of soil moisture of natural grassland in the northern slopes of the Mountains Qilian |
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| DOI：10.7606/j.issn.1000-7601.2011.03.43 |
| Key Words: meteorological factor natural grassland potential evapotranspiration soil moisture content Mountains Qilian |
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| Abstract: |
| We conducted a field study by regresson and correlation analysis to examine the relationships between soil moisture and meteorological factors for five kinds of grassland in the northem slopes of the Mountains Qilian; and soil moisture was collected from the study site along with synchronous meteorological data in 2004 for analysis. The results showed that (1)Dynamic change of soil moisture was determined by precipitation and its seasonal distribution, and re-gression equation between precipitation and soil moisture were set up. (2) The potential evapotranspiration of five types of grassland was analysed based on ASCEPM model. The relat ionship between potential evapotranspirat ion and soil mois-ture in 0~20 cm soil layer was significant(P<0.05). But there was no correlation between potential evapotranspiration and other soil layers. (3) Air temperature，soil temperature，relative humidity and near ground wind speed exert an in-fluence on soil moisture, and the responses of soil moisture to these factors were descending along the soil layer depth. |