福建安曹下丰产杉木人工林林窗边缘效应的研究

根据福建安曹下杉木丰产林全林林窗样地调查资料,运用Shannon-Wiener物种多样性指数和Simpson生态优势度指数计算边缘效应强度指数。33个林窗的测定数据表明:用物种多样性指数测定的林窗边缘效应强度值ED为0.6-1.8,而用生态优势度值测定的边缘效应强度值Ec为0.3-3.4。人为干扰形成林窗与自然干扰形成的林窗边缘效应强度接近,边缘效应强度ED在250-300m2面积林窗内达最大值。边缘效应的作用有增大林窗边缘区物种多样性的趋势。

Edge Effect of Gaps in Cunninghamia lanceolata Plantation in Ancaoxia, Fujian Province

The edge effect of 33 gaps were studied in Cunninghamia lanceolata plantation in Ancaoxia, Fujian Province, China, using the Shannon-Wiener index and Simpson index. The two indexes illustrate the species diversity and the ecological dominance, respectively. The gap edge effect index based on the species diversity (ED) was 0.6-1.8 and that based on the ecological dominance (Ec) was 0.3-3.4. Human disturbance had the same effect on the edge effect of the gaps as nature, and ED reached the peak in the gaps of 250-300 m2 in size. The edge effect of the gaps is suitable for species diversity in the edge zone.