基于MODIS LST产品的山东省森林调节温度生态服务价值评估新方法

A New Method of Valuating the Ecological Service of Temperature Regulation of Forests in Shangdon Province Based on MODIS LST Products

【目的】提出一种评估森林调节温度生态服务价值的新方法,弥补目前对于森林冬季保温作用价值的计算,为正确认识和定量评估森林生态服务价值及进行生态系统管理提供参考。【方法】以山东省森林为研究对象,利用MODIS反演的LST(地表温度)产品和土地覆盖产品,从地气能量辐射平衡出发,以森林覆盖区与城镇区地面的近地面气温差表征森林对温度的调节作用,计算出两地类近地面大气在一段时间内的能量差别,进行气温差转换,并由此求取森林调节温度生态服务价值。【结果】森林调节温度的作用主要表现在白天,晚上作用不明显,且森林在夏季的降温作用比在冬季的保温作用显著;山东省森林2012年调节温度的价值为夏季降温作用价值和冬季保温作用价值的总和,约为1 003.6亿元,2012年白天,山东省森林夏季因降温作用产生的生态服务价值约为冬季保温作用的10倍左右。【结论】提出一种基于热红外遥感与地气能量辐射平衡的森林调节温度生态服务价值评估新方法,利用遥感数据和地气能量辐射平衡公式,计算不同时段(夏季降温和冬季保温)森林调节温度的生态服务价值,同时又可考虑研究区的空间差异性,对定量评估森林生态服务价值及进行生态服务功能管理具有重要的借鉴意义。

【Objective】This paper intends to provide a new method of quantitative evaluation of forest ecosystem service of temperature regulation. This method builds up value calculation of insulation in winter and provides a basis for correct understanding and quantitative assessment of forest ecological service value. 【Method】The forests in Shandong Province were studied using MODIS derived LST（ land surface temperature） product,land cover product to calculate the energy convert to temperature difference of atmosphere near the ground between forest and other surface type to evaluate the service value of temperature regulation function of forest. 【Result】The result showed that the effect of regulating temperature by forest mainly behavior during the daytime instead of night. The cooling function in summer is more significant than heat preservation function in winter. The total value of temperature regulation function of daytime in summer and winter of 2012 was about 100. 4 billion RMB in Shandong Province. The value product in summer by cooling function is about 10 times in winter which product by heat preservation function. 【Conclusion】The new method to calculate forest ecosystem service of temperature regulation based on thermal infrared remote sensing and energy balance can calculate the value of temperature regulation of forest in any period. This method makes up the calculation of forest heat preservation in winter and takes the spatial differentiation into consideration. This method has significant implications for quantitative assessment of forest ecosystem service value and function of ecological service.