矮嵩草草甸土壤温湿度对植被盖度变化的响应

Responses of Soil Temperature and Humidity to Changes of Vegetation Coverage in Alpine Kobresia tibetica Meadow

利用5-9月植物生长期间所观测的不同植被盖度条件下土壤温、湿度资料,分析了矮嵩草草甸植被盖度对土壤温、湿度的影响。结果表明:有植被覆盖区随季节进程,植被盖度增加,土壤温度升高,湿度下降;8:00-19:00土壤温度随植被盖度的增加而增加,14:00土壤温度随植被盖度增加而降低;不论是早晚还是中午,土壤湿度都随植被盖度的增加而增加。

The responses of soil temperature and humidity to change of vegetation coverage were analyzed, based on the observed data of the soil temperature and humidity under different vegetation coverage in two sites during the growing period of alpine Kobresia tibetica meadow. The results showed that the variation of vegetation coverage correspond with the seasonal change, soil temperature enhanced and soil humidity declined with the increase of vegetation coverage. From morning （8：00） to afternoon （19：00）, the soil temperature increased with the increasing of vegetation coverage, while it decreased with the increasing of vegetation coverage at the noon （14：00）. Whenever it was in the morning and afternoon or at noon, the soil humidity would increase with the development of vegetation coverage.