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科尔沁沙地沙漠化过程中的物种多样性 预览 被引量:93

Species diversity during desertification on Kerqin Sandy Land.
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摘要 对内蒙古科尔沁地区沙漠化过程中物种多样性的变化特征进行了分析,依据植物种在各类型沙漠化土地的出现频率和不同沙漠化阶段各生活型植物种的组成,探讨了沙漠化过程中植物种绝灭和定居特点,物种多样性指数分析表明,沙漠化过程是一个物种多样性衰减的过程,沙漠化首先导致特有种的绝灭,其次为稀有种和普通种,从植物生态型来看,我年生草本和藻在植物受沙漠化影响最大,而1年生一和半灌木类植物可存活于沙漠化过程各个阶段,在 This paper analyes the changing characteristics of species diversity during the process of desertification in Kerqin,Inner Mongolia.Based on the frequency of species occurrence and the life form composition of species at different stages of desertification,the characteristics of species colonization and extinction are discussed. The species diversity indices show that desertification is a process of biodiversity loss.In particular, specialized species are wipped out first, rare species vanish second, and common species begin to disappear.Change in life form composition indicates that perennial herbaceous and scrubby plants are severely affected by desertification,whereas annuals and semi shrub species occur at all stages of desertification.The extinction rate of plants in this area is higher than their colonization rate.
作者 常学礼 邬建国 Chang Xueli(Institute of Desert Research,Academia Sinica,Lanzhou 730000)and Wu Jianguo(Department of Life Sciences,Arizona State University West,Phoenix,USA).
出处 《应用生态学报》 CAS CSCD 1997年第2期 151-156,共6页 Chinese Journal of Applied Ecology
基金 国家自然科学基金! ( 4960 1 0 2 0 ) 中国科学院留学回国人员择优支持基金
关键词 植物生态 物种多样性 沙漠化 内蒙古 科尔沁地区 Species diversity,Species diversity index,Species richness,Desertification,Kerqin region of Inner Mongolia.
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