盐池县草地沙漠化过程中植物群落的动态变化  

Dynamics of Plant Community during Sandy Desertification for Grassland in Yanchi County

作　　者：许冬梅[1,2] 赵丽莉[1,2] 谢应忠[1,2] 

机构地区：[1]宁夏大学农学院,银川750021 [2]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川750021

出　　处：《西北植物学报》2011年第10期2084-2089,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(30860200);国家973计划前期研究专项(2010CB434805);宁夏自然科学基金(NZ1038)

摘　　要：对盐池县潜在沙漠化草地、轻度沙漠化草地、中度沙漠化草地、重度沙漠化草地和极度沙漠化草地5种不同沙化类型草地植被物种组成及多样性进行研究,以探讨沙漠化对地上植被的影响。结果表明:随着沙化程度的加重,多年生草本植物逐渐减少,优势度由潜在沙漠化草地的88.73%降至极度沙漠化草地的19.97%;一年生草本植物及沙生灌木、半灌木逐渐增加,优势度由潜在沙漠化草地的12.67%增至极度沙漠化草地的80.03%。多样性指数由轻度沙漠化草地的2.21下降至极度沙漠化草地的1.52。The vegetative composition and species diversity in potential desertification grassland,light desertification grassland,medium desertification grassland,severe desertification grassland and extreme desertification grassland in Yanchi were studied to explore the impact of desertification on vegetation.The results showed that：the perennial species gradually gave place to psammophyte annuals,shrubs and semi-shrubs.The dominance of perennial species declined from 88.73% for potential desertification grassland to 19.97% for extreme desertification grassland.The dominance of psammophyte annuals,shrubs and semi-shrubs increased from 12.67% for potential desertification grassland to 80.03% for extreme desertification grassland.The diversity index decreased from 2.21 for light desertification grassland to 1.52 for extreme desertification grassland with sandy desertification.

关 键 词：草地沙化 植被组成 物种多样性 

分 类 号：Q948.154[生物学—植物学]