植被时空变化的估算方法
Plant diversity is used as an indicator of the well-being of vegetation and ecological systems. Human activities and global change drive vegetation change in composition and competition of species through plant invasions and replacement of existing species on a given scale. However,species diversity indices do not consider the effects of invasions on the diversity value and on the functions of ecosystems. On the other hand, the existing methods for diversity index can not be used directly for cross-scale evaluation of vegetation data. Therefore, we proposed a 3-dimensional model derived from the logistic equation for estimating vegetation change, using native and non-native plant diversity. The two variables, based on the current and the theoretical maximum diversity of native plants on a given scale, and the result of the model are relative values without units, and are therefore scale-independent. Hence, this method developed can be used directly for cross-scale evaluations of vegetation data, and indirectly for estimating ecosystem or environmental change.
作 者： 李迈和 Norbert Kr(a)uchi LI Maihe Norbert Kr(a)uchi 作者单位： WSL,Swiss Federal Institute for Forest,Snow and Landscape Research,Zürcherstrasse 111,CH-8903 Birmensdorf,Switzerland 刊 名： 地理学报(英文版) ISTIC SCI 英文刊名： JOURNAL OF GEOGRAPHICAL SCIENCES 年，卷(期)： 2003 13(4) 分类号： Q948 关键词： biodiversity biological invasions ecosystem health global change land use