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根据1999—2002年连续4年的观测数据,对林冠截留在杉木林生态系统物质循环中的作用进行研究。结果表明:每年林冠截留降雨量267·0mm;林冠截留蒸发散量占杉木人工林总蒸发散量的27·2%,林冠截留水分的物理蒸发量占杉木林集水区水分输出的18·97%;林内净降水的营养物质为143·329kg·hm-2a-1,比冠上大气降水输入的63·924kg·hm-2a-1多74·905kg·hm-2a-1,增加了117·2%;林冠截留减少了到达林地表面和入渗土壤的水分,减少了集水区地表水和土壤漏水的输出,从而减少了营养物质的输出,可见,林冠截留是系统保存营养物质的重要机制之一。
According to the observation data of four consecutive years from 1999 to 2002, the role of canopy retention in the material circulation of Cunninghamia lanceolata ecosystem was studied. The results showed that the annual canopy interception rainfall was 267.0 mm, the canopy interception evapotranspiration accounted for 27.2% of the total evapotranspiration of Cunninghamia lanceolata plantation, and the physical evaporation of canopy interception water accounted for 18.97% of the water output of Cunninghamia lanceolata forest catchment %; The net precipitation of nutrients in the forest was 143.329kg · hm-2a-1, which was 117 · 7 more than the input of 63.924kg · hm-2a-1 and 74 · 905kg · hm-2a-1 2%. The canopy interception reduced the water reaching the forest land surface and soil infiltration, reduced the output of surface water and soil water leakage in the catchment area, thus reducing the output of nutrients. Therefore, the canopy interception is an important mechanism for preserving nutrients in the system one.