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拉萨河谷植物群落分类与排序及物种丰富度与环境的关系

张燕杰1,崔玲玲1,庞有智2,刘杰1,拉多1**   

  1. 1西藏大学理学院, 拉萨 850000; 2内江师范学院地理与资源科学学院, 四川内江 641100)
  • 出版日期:2015-12-10 发布日期:2015-12-10

Classification and ordination of plant communities and the relationship between species richness and environmental factors in Lhasa valley.

ZHANG Yan-jie1, CUI Ling-ling1, PANG You-zhi2, LIU Jie1, Laduo1**   

  1. (1College of Science, Tibet University, Lhasa 850000, Tibet, China; 2College of Geography and Resources Sciences, Neijiang Normal University, Neijiang 641100, Sichuan, China)
  • Online:2015-12-10 Published:2015-12-10

摘要: 以拉萨河谷区域的植物群落为研究对象,设置30个样地、90个植物样方,运用双向指示种分析法(TWINSPAN)进行群落的分类分析,运用除趋势对应分析法(DCA)进行群落的排序分析,运用广义可加模型(GAM)进行转换后的物种丰富度(TSR)与海拔、覆盖度、纬度、经度的关系分析。TWINSPAN分类将拉萨河谷的植物群落分为8组,即落叶阔叶林、落叶阔叶灌丛、根茎苔草草甸和丛生嵩草草甸、常绿针叶灌丛草甸和落叶阔叶灌丛草甸、落叶阔叶灌丛草原、丛生禾草荒漠、落叶阔叶灌丛荒漠、小半灌木荒漠,很好地反映了群落的间断性;DCA排序的样方排序结果与TWINSPAN数量分类结果基本一致,很好地反映了群落的连续性及其生境的异质性,DCA排序结果表明,湿度是拉萨河谷植物分布的主导因素;GAM拟合模型显示,TSR沿海拔梯度的分布格局为低-高-低-高-低的双峰格局。

关键词: 冬小麦, 施氮量, 冠层, 粒叶比, 滴灌

Abstract: The plant community structure and the relationship between species richness and environmental factors in Lhasa valley located in the south central of Tibet Autonomous Region were studied, with 30 plots and 90 quadrats, by using twoway indicator species analysis (TWINSPAN), detrended correspondence analysis (DCA) and generalized additive model (GAM). TWINSPAN classification identified 8 groups of plant communities, including deciduous broadleaf forest, deciduous broadleaf shrubs, Carex form rhizomatous meadow and Kobresia form caespitose meadow, evergreen needleleaf scrubs meadow and deciduous broadleaf shrubs meadow, deciduous broadleaf shrubs steppe, caespitose grass desert, deciduous broadleaf shrubs desert, and halfshrub desert, reflecting the intermittency of communities. TWINSPAN classification results were consistent with DCA ordination results, well reflecting the continuity of communities and the heterogeneity of habitats. DCA ordination indicated that moisture was the main factor influencing vegetation composition and distribution in the study area. The fitted line of transformed species richness (TSR) along the elevation gradient based on GAM showed a tendency of bimodal curve.

Key words: grain-leaf ratio., nitrogen application rate, winter wheat, canopy, drip irrigation