【摘要】 系统研究分析密云县潮关西沟封育区天然次生林的生态修复效果。研究表明 :经过近 2 0年的封育 ,林分的郁闭度提高了近 0 2 ,林场的林木覆盖率从 7 2 %提高到 93 8% ,生物多样性、林木生物量、植被群落 ,都有所增加。平均林分郁闭度超过 0 4 ,比封育前提高 0 1～ 0 2 ,植被覆盖度超过 90 % ,林木在截留降水、提高林地蓄水、减少地表径流、防治水土流失等方面发挥了重要作用。更多还原

【Abstract】 The paper provided a systematic analysis of ecological restoration effects of natural secondary forest of closure area in Chao Guanxi Gou, Miyun County. The study indicated that through nearly twenty years of hillclosing afforestation, canopy closure has been improved about 0 2; cover rate of forest has raised from 7 2% to 93 8%; biodiversity, tree biomass and vegetation community have increased to a great extent. Compared with the average canopy closure before hillclosing afforestation in this area, it has raised 0 1～0 2 and has been over 0 4. Forest coverage degree is over 90%. Consequently, the forest plays more important roles in intercepting precipitation, improving water storage capacity of soil, decreasing the surface runoff, controlling soil erosion.更多还原