摘要
在北屯绿洲选择了3组不同年限的次生盐渍化弃耕农田,分别计算了样地内每种植物的重要值,采用Shannon-Wiener指数、Pielou指数、Simpson指数测定了生物多样性。结果表明:3组群落组成存在显著差异,优势种更替明显。3组群落构成依次为,一年生草本、一年生草本+多年生小半灌木、多年生草本+灌木。物种多样性表现为2年群落>5年群落>13年群落;群落均匀度表现为2年群落>5年群落,而5年与13年群落相当,但是生态优势度却表现出与物种多样性相反的趋势,即2年群落<5年群落<13年群落。
In this study, some important values of each plant in 2-year, 5-year and 13-year plant community plots in the farmlands discarded from cultivation for different years in the Beitun Oasis, Xinjiang, are calculated, and the values of hiodiversity in the plots are measured, compared and lucuhrated by applying Shannon-Wiener index, Pielou index and Simpson index. The results reveal that the community composition of the 3 groups of plant commu- nity plots in the farmlands discarded from cultivation for different years is significantly different, and the succession of dominant plant species is obvious. The community composition of the 3 groups is in an order of annual herba- ceous plants, annual herbaceous plants ＋ perennial short half-shrubs, and perennial herbaceous plants ＋ shrubs. The succession of the plant communities is particular to a certain extent. There is a regularity in the change of biodlversity, the species diversity is in an order of 2-year community 〉 5-year community 〉 13-year community, neity of 2-year community is higher than that of 5-year community, and the neity of 5-year community is similar to that of 13-year community. The trend of ecological predominance is contrary to that of species diversity, i.e. in an order of 2-year community 〈 5-year community 〈 13-year community.
出处
《干旱区研究》
CSCD
北大核心
2007年第6期747-752,共6页
Arid Zone Research
基金
中国科学院知识创新领域前沿项目(KZCX-XJ02-02)
重要方向性项目(KZCX3-SW-327-04)
国家重点基础研究发展规划项目(G199904350902)资助
关键词
绿洲
植被动态
弃耕农田
群落组成
生物多样性
北屯
新疆
arid zone
vegetation dynamics
land discarded from cultivation
community composition
biodiversity
Beitun Oasis
Xinjinag.
作者简介
林毅(1980-)，男，新疆伊宁人.硕士研究生，主要从事绿洲生态研究．E-mail：linyi999@163．com.
