福建安曹下丰产杉木人工林林窗边缘效应的研究

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

摘要:

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E_D为0.6-1.8，而用生态优势度值测定的边缘效应强度值E_C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E_D在250-300 m²面积林窗内达最大值。由于边缘效应的作用有增大林窗边缘区物种多样性的趋势。

关键词:杉木人工林;林窗;边缘效应;物种多样性;生态优势度

Abstract:

The edge effects 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 (E_D) was 0.6-1.8 and that based on the ecological dominance (E_C) was 0.3-3.4. Human disturbance and nature disturbance had the same effect on the edge effects of the gaps, and E_D reached the peak in the gaps of 250-300 m² in size. The edge effects of the gaps were suitable for species diversity in the edge zone.

Key words:Cunninghamia lanceolata Plantation; Gap; Edge effect; Species diversity; Ecological dominance