摘要
在地理信息系统(GIS)支持下对黄土高原地区257个样方的植被进行了研究。DCA分析较好地反映了植被的连续性变化及植被的生态梯度与气候因子的关系。分析的结果表明,植被组成和结构沿经、纬度变化明显,分异出森林、森林草原、温性草原、荒漠半荒漠植被等不同类型,优势种替代明显,植物种类也形成了不同的生态类型。植被的梯度变化与气候因子密切相关,较好地反映了黄土高原地区环境与结构的空间变异特点。
Vegetation for 257 samples in loess plateau were analyzed with the aid of GIS. The analyses of DCA reflected the continous changes of vegetation and the relation between vegetation eclogy gradients and climatic variables. These analyses illustrated that the composition and structure of vegetation varied greatly along the longitude and latitude. Four types of forest, forest-steppe , temperate steppe and desert and semi-desert vegetation can be identified. Species ecotypes were obvious along the transect. Vegetation were closely related to climatic variables,it expressed the gradients and the variation characteristics of the community structure and environment well.
出处
《重庆环境科学》
北大核心
2003年第7期35-36,42,共3页
Chongqing Environmental Science
基金
国家自然科学基金项目(3007014)
关键词
黄土高原
地理信息系统
植被生态梯度
气候因子
loess plateau
geographical information system
vegetation ecology gradients
climatic variables
