CHANGES IN DIVERSITY ALONG A SUCCESSIONAL GRADIENT IN A COSTA-RICAN UPPER MONTANE QUERCUS FOREST

被引：49

作者：

KAPPELLE, M

KENNIS, PAF

DEVRIES, RAJ

机构：

[1] Hugo de Vries Laboratory, Amsterdam University, Amsterdam, 1098 SM

[2] Experimental Plant Ecology, Nijmegen Catholic University, Nijmegen, 6525 ED, Toernooiveld

来源：

BIODIVERSITY AND CONSERVATION | 1995年 / 4卷 / 01期

关键词：

COSTA RICA; DIVERSITY; FOREST RECOVERY; QUERCUS; SECONDARY SUCCESSION; TROPICAL MONTANE FOREST;

D O I：

10.1007/BF00115312

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

Changes in terrestrial vascular plant diversity along a successional gradient were studied in a Costa Rican upper montane Quercus forest. In 1991 and 1992 species presence and cover were recorded in 12 successional 0.1 ha forest plots. A total of 176 species in 122 genera and 75 families were found. Asteraceae was the most speciose family. With the help of TWINSPAN three successional phases were classified: (i) Early Secondary Forest (ESF, 145 spp.), (ii) Late Secondary Forest (LSF, 130 spp.) and (iii) Primary Forest (PF, 96 spp,). Detrended Correspondence Analysis (DCA) species ordination using DECORANA illustrates that different ecological species groups can be distinguished along the time sequence. Alpha diversity (Shannon-Wiener index, among others) in ESF and LSF was significantly greater than in PF. This is probably explained by downslope migration of numerous sub(alpine) species to cleared and recently abandoned montane sites. Beta diversity applying Sorensen's similarity coefficients declined during succession. Using linear regression, the minimum time required for floristic recovery following disturbance and abandonment was calculated at 65.9 years. A comparison with other studies shows that secondary forests in upper montane Costa Rica can be as diverse as in neotropical lowlands.

引用

页码：10 / 34

页数：25

共 75 条

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