鹤山南亚热带草坡生态系统的太阳辐射能环境

THE ENVIRONMENT OF SOLAR RADIATION ENERGY OF THE SOUTH-SUBTROPICAL HILLSLOPE ECOSYSTEM IN HESHAN, GUANGDONG PROVINCE

摘要:

本文以鹤山丘陵综合试验站草坡为研究对象，分析了鹤山南亚热带草坡多年的辐射能环境．揭示了辐射与环境的关系，主要结果如下：１．全年抵达草坡的太阳总辐射约４７７５．２ＭＪｍ－２ａ－１，其中直接辐射为３１３４．１ＭＪｍ－２ａ－１，散射辐射为１４４１．１ＭＪｍ－２ａ－１．它们受太阳高度角、云量、大气透明系数和大气光学特性的影响较大．２．太阳总辐射、直射的月变化呈双峰曲线，５月和８月为峰值，２月和６月为谷值．３．全年草坡的反射辐射量为８２２．５ＭＪｍ－２ａ－１．群落的年均反射率为１７．２％，其月变化因入射光特性和群落的发育状况的不同而变化．４．草坡的净辐射力２９１５．６ＭＪｍ－２ａ－１，占总辐射的６１．１％．其最大值出现在５月，为３８０．２ＭＪｍ－２ａ－１，最低值出现在２月，为１２９．３ＭＪｍ－２ａ－１，７－９月比较稳定且值相对较高．５．群落发育成熟后，其对太阳辐射的截获能力很强．其透射率仅１７．２％，其冠层截获率为６５．４％．

Abstract:

Measurements of environment of solar radiation energy components were madeon Heshan (Guangdong Province) hillslope ecosystem in lower-subtropics. The major resultsare as follows: 1. The amount of gross solar radiation reaching the canopy layer was4775.2MJ m-2a-1, in which the diffuse radiation was 1441.1M m-2a-1, and the direct radiationwas 3134.1 MJ m-2a-1. 2. The seasonal changes of solar radiation and the direct radiationwere double-peak curve. The monthly maximum value appeared in May and August, andthe...