草地沙漠化过程中功能群组成与群落生产力关系研究  

The relationship between functional group composition and plant community productivity in sandy grasslands along desertification gradients

作　　者：赵丽娅[1] 杨湛 陈红兵[1] 李兆华[1] 赵哈林[3] 赵学勇[3] 

机构地区：[1]湖北大学资源环境学院,湖北武汉430062 [2]Atlantic Baptist University [3]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000

出　　处：《湖北大学学报（自然科学版）》2009年第1期88-91,共4页Journal of Hubei University：Natural Science

基　　金：国家自然科学基金项目(30470284);湖北大学自然科学基金(400-095163)资助

摘　　要：采用野外调查方法,对不同类型草地功能群组成与其植物群落生产力之间的关系进行探讨.结果表明:在流动、半流动和半固定沙地中,藜科植物的作用比较明显,而其他功能群植物的作用较弱;在固定沙地中,禾本科、豆科植物的作用明显增强.不同类型草地群落植物功能群盖度与群落初级生产力呈显著线性相关.功能群内植物种密度对群落的生产力也有显著的影响,流动和固定沙地植物功能群密度与功能群初级生产力呈线性相关,而半流动和半固定沙地不存在显著相关性.The relationship between plant functional composition, coverage, density and productivity in different grassland types were analyzed, The research results showed that the effects of the Chenopodiaceae functional group on productivity were greater than other functional groups in shifting, semi-shifting and semi-fixed sandy grasslands. And the Legume functional groups accounted for higher proportion of community productivity in fixed sandy grassland. A significant correlation was found between the coverage per functional group and the primary productivity of communities in the four types of sandy grasslands. There was a significant correlation between the density per functional group and the primary productivity of communities in the shifting and fixed sandy grasslands, and a significant correlation was not found between the density per functional group and the primary productivity of communities in semi-shifting and semi-fixed sandy grasslands.

关 键 词：沙漠化 群落 生产力 功能群 

分 类 号：Q145.2[生物学—生态学]