火烧和放牧影响下羊草草地微气候的比较研究

Comparative study on microclimate of Aneurolepidium chinense grassland under burning and grazing

对羊草草地火烧、未火烧、过度放牧和禁牧区植物群落温度、土壤温度、土壤湿度、大气温度、相对湿度进行了测定．结果表明，白天火烧区群落温度比未火烧区低２．５～５℃，而夜晚则高于未火烧区０．１～１℃．白天火烧区土壤温度比未火烧区高５～７，５℃，夜晚为１～２．５℃．过牧区群落温度与禁牧区差异不显著，但过牧区土壤温度基本高于禁牧区，土壤湿度小于禁牧区．同一区中，白天群落温度变化为低处大于高处，夜晚则相反，而白天土壤温度为表层大于深层，夜晚则基本为深层大于表层．

The canopy temperature, soil temperature, soil humidity, air temperature and relativehumidity are measured at burned, unburned, overgraing and ungrazing plots of Aneurolepidium chinense grassland. The results show that at daytime, the canopy temperature atburned plot is about 2. 5～5 ℃ lower than that at unburned one, but about 0. 1～1 ℃ higher at night. The soil temperature at burned plot is about 5～7. 5℃ higher than that at unburned one at daytime, but about 1～ 2. 5℃ higher at night. No significant difference ofcanopy temperature is found between overgrazing and ungrazing plots, but soil temperature at overgazing plot is higher than that at ungrazing one. At the same plot, the temperature of lower canopy is higher than that of higher one at daytime, but lower at night.Soil surface layer has a higher temperature than the deeper layers at daytime, but has alower one at night.