关键词: 火烧, 过度放牧, 微气候, 羊草草地, 黄河三角洲, 土壤呼吸, 降雨变化, 光合作用, 滨海湿地

Abstract: 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.

Key words: Burning, Overgrazing, Microclimate, Aneurolepidium chinense grassland, photosynthesis, soil respiration, change in precipitation amount, coastal wetland, the Yellow River Delta