高寒草甸植物群落物种多样性和生产力关系的光竞争研究

被引:9
作者
邱波
杜国祯
机构
[1] 兰州大学干旱农业生态实验室
[2] 兰州大学干旱农业生态实验室 兰州
[3] 兰州
基金
国家自然科学基金重大项目;
关键词
光竞争; 物种多样性; 生产力; 高寒草甸;
D O I
暂无
中图分类号
Q948.15.8 [];
学科分类号
071012 ; 0713 ;
摘要
通过施肥形成的生产力由低到高的过程中,物种多样性往往降低。总体竞争假说认为对所有资源的竞争作用对多样性的影响随着生产力提高而加剧,导致物种多样性的下降;光竞争假说则认为随着生产力提高,种间竞争从低生产力时的地下竞争转向高生产力时的光竞争,是光竞争导致了物种多样性的下降。为了验证这两种假说,本文通过在甘南玛曲高寒草甸的均匀施肥实验,研究了光竞争对高寒草甸植物群落物种多样性和生产力关系的影响。结果表明:(1)随着施肥梯度的增加,大部分植物的生长速率加快,高度和叶面积增加;(2)随着施肥梯度的增加,植物群落地上总的生物量提高,叶面积指数增加,透光率降低,物种多样性减少;(3)个体大小不对称的光竞争导致了高寒草甸植物群落物种多样性随施肥梯度的增加而减少。
引用
收藏
页码:1646 / 1650
页数:5
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