青藏高原东缘人工草地群落物种丰富度对杂草入侵的影响  

Effects of species richness on weed invasion in an artificial grassland ecosystem in eastern Tibetan Plateau

作　　者：李昂[1,2] 顾梦鹤[1] 张世挺[1] 周显辉[1] 汪洋[1] 李伟[1] 杜国祯[1] 

机构地区：[1]兰州大学干旱与草地生态教育部重点实验室,兰州730000 [2]兰州城市学院,兰州730070

出　　处：《生态学杂志》2009年第2期177-181,共5页Chinese Journal of Ecology

基　　金：国家自然科学基金资助项目(90202009)

摘　　要：物种丰富度和生态系统功能间的关系是近年来生物多样性研究的中心问题,其中群落抗杂草入侵是其功能的重要表现形式。本文利用青藏高原东缘地区3种野生优良牧草:垂穗披碱草(Elymus nutans)、中华羊茅(Festuca sinensis)和羊茅(F.ovina),构建人工草地群落,探讨了物种丰富度与杂草入侵能力间的相互关系及其潜在的作用机理。结果表明:随着群落中物种丰富度的增加,入侵杂草的物种数、秧苗数和生物量均表现为显著下降趋势(P<0.05);杂草的物种数、秧苗数和生物量间存在极显著的正相关(P<0.01);群落的物种丰富度与入侵杂草间的负相关关系可能是选择效应和补偿效应共同作用的结果;2004-2007年,群落中入侵杂草的物种数和生物量有增加趋势,而秧苗数的变化趋势不明显。The relationship between species richness and ecosystem function is one of the core issues in recent biodiversity research, while Weed invasion resistance is an important modality of ecosystem function. Through the construction of artificial grassland ecosystem with the wild grass species Elyrnus nutans, Festuca sinensis and F. ovina in eastern Tibetan Plateau, this paper studied the relationship between species richness and weed invasion and the underlying mechanisms. The results showed that with the increase of species richness, the species number, individual number, and biomass of invaded weeds all decreased significantly （P 〈 0. 05 ） , and had significant positive correlations （P 〈 0. 01 ） with each other. This negative relationship between species richness and weed invasion could be the result of the interaction between selective and comple- mentary effects. In 2004-2007, the species number and biomass of invaded weeds had an increasing trend, while the individual number changed insignificantly.

关 键 词：人工草地 物种丰富度 杂草入侵 

分 类 号：S812.6[农业科学—草业科学]