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对大明山退化生态系统不同恢复阶段群落的光照强度进行了分析和比较。结果表明 :1.随着退化生态系统的恢复 ,群落内的光照强度明显减弱。 2年恢复期的群落 ,其光照强度是空旷地的 60 %～ 66% ,2 0年的群落为 14%～ 18% ,50年的群落只是 3%～ 9%。 2 .群落的光照强度具有明显的日变化和季节变化 ,但在不同恢复阶段的群落中是不同的。森林阶段光照强度的日和季节波动比灌丛阶段的平缓。3.不同恢复阶段群落的光照强度变化是退化生态系统恢复演替的一个主要推动力
The light intensities of communities in different recovery stages of the degraded Ecosystem in Daming Mountain were analyzed and compared. The results showed that: 1. With the restoration of degraded ecosystems, the light intensity in the community was significantly weakened. The community with 2-year restoration period had a light intensity of 60% -66% in open areas, 14% -18% in 20 years, and only 3% -9% in 50 years. The light intensity of the community has obvious diurnal and seasonal changes, but it is different in the community of different restoration stages. Day and seasonal fluctuations of light intensity in the forest stage were less than those in the shrub stage. The change of light intensity of communities in different restoration stages is one of the main driving forces for the succession of restoration of degraded ecosystems