摘要
通过野外控制实验,研究了高寒矮嵩草草甸不同植物类群、群落对模拟增减降水条件下的响应。结果表明,不同植物类群(禾草类、莎草类)增加降水20%,地上生物量分别比对照提高103.63、77.12g/m2。在植物生长期(6月),增加降水20%及40%,植物群落物种多样性指数(H)分别比对照提高0.188和0.735;而均匀度指数(J)在增加降水40%时,提高了0.086。生长期(7月)增加降水20%,物种多样性指数(H)和均匀度指数(J)分别提高0.409和0.07。当降水增加20%时,植物群落中禾草类的重要值较对照提高了0.92。
Field controlled experiments were conducted to examine the response of different plant groups and communities to simulated precipitation changes in an alpine Kobresia humilis meadow. The results indicated that in the grass group and sedge group, the above ground biomass in the plots, where the precipitation increased by 20%, was 103.36 g/m2 and 77.12 g/m2 respectively, over that of the control plot. In the growing season of plants (June), the diversity index (H) of plant community in plots where the precipitation increased by 20% and 40% was 0.188 and 0.735, respectively, the evenness index (J) with 40% increase of precipitation was 0.086, over that of the control plot. In the growing season of plants (July), the diversity index (H) and evenness index (J) of plant community in plot with 20% increase of precipitation was 0.409 and 0.07, respectively, over that of the control plot. The important value of grasses of plant communities in plot with 20% increase of precipitation was 0.92 over that of the control plot.
出处
《草业学报》
CSCD
2003年第2期25-29,共5页
Acta Prataculturae Sinica
基金
国家重点基础研究发展规划项目(G1998040814)
中国科学院知识创新工程项目(KSCX2-1-07)
国家"十五"科技攻关计划项目(2001BA606A-02-03)
中国科学院海北站基金项目资助。
