大明山退化生态系统群落光照的变化

A Change Regulations of Community Light Intensity of the Degraded Ecosystem in Daming Mountain

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.

In this paper,the lightintensity of community at different restoration stages in degraded ecosystem of Daming Mountain were analysed and compared.The results were as follows: 1 .With the restoration of degraded ecosystem,the lightintensity in communities showed a significant reduction.The light intensity of community in2 years recovering period was only6 0 %～ 6 6 % of the open area.The light intensity of community of2 0 years and5 0 years was1 4%～ 1 8% and3%～ 9% of the open area,respectively. 2 .The light intensity in community had obvious diurnal and seasonal variations.Thevariations of light intensity were different in community of different restoration stages.The diurnal and seasonal fluctuation of light intensity in the forest is less stronger than that in shrub stage. 3.The variation of light intensity was a main driving force of the restoration succession in degraded ecosystem.