盘锦湿地芦苇(Phragmites communis)群落蒸发散主导影响因子

利用2005年全年盘锦芦苇湿地梯度观测和涡动相关系统的监测数据,对芦苇群落的蒸发散变化规律及其主导影响因子分析表明,不同月份芦苇群落蒸发散日变化呈现出相同的变化趋势,即早晚低、中午高的单峰型曲线;芦苇群落蒸发散主要受当地气象因素、植被生长状况和生理生态特征的影响.相关分析表明,芦苇湿地蒸发散与净辐射、气温、地表温度、相对湿度、风速、土壤含水量等环境因素的变化都有很好的响应.回归分析表明影响生长季主要因素有:净辐射、土壤含水量、相对湿度、气温和地表温度;影响非生长季主要有:净辐射、地表温度和风速.同时,植被生长状况和生理生态特征对蒸发散也有显著影响,其中叶面积指数与气孔导度是芦苇群落蒸发散的主导影响因子.

Evapotranspiration of Phragmites communis community in Panjin Wetland and its controlling factors

Based on the data of the whole year in 2005, including the microclimate gradient observation data, eddy covariance observation data, and ecophysiological observation data in Panjin Wetland Ecosystem Research Station, Institute of Atmospheric Environment, China Meteorological Administration, the daily evapotranspiration variation and its controlling factors of Phragmites communis community was analyzed. The results showed that the daily evapotranspiration variation in different months could be expresses as a single peak curve that was lower in the morning and evening and higher around noon. meteorological factors and biological factors would affect the evapotranspiration. According to the correlative analysis, the evapotranspiration variation of Phragmites communis wetland has good responding to the environmental factor such as radiation, air temperature, surface temperature, relative humidity, wind speed and soil moisture. Regression analysis indicates, the major factors ingrowing season are: radiation, soil moisture, relative humidity, air temperature and surface temperature; the factors in non-growing season are: radiation, surface temperature and wind speed. At the same time, vegetation growth situation and biological characteristic had significant effects on the evapotranspiration of Phragmites communis, especially, leaf area index, leaf transpiration rate and leaf conductance.