| 摘要: |
| 【目的】调查阿尔泰山两河源草地地上植被，确定点位因子对草地地上生物量和物种多样性的影响，为两河源草地管理、维护以及我国西北干旱地区草地生态安全提供数据支撑。【方法】以两河源草地为研究对象，沿经度、纬度和海拔梯度调查了30个样地草地的植被状况，利用α-多样性测度中Margalef丰富度指数、Simpson优势度指数、Shannon-Wiener多样性指数和Alatalo均匀度指数对草地物种多样性进行分析。【结果】两河源草地地上生物量与物种多样性表现出明显空间规律，地上生物量呈中西部高，东南部低的空间分布特征，而物种多样性则呈现东南高西北低的空间格局；同时地上生物量和物种多样性与纬度、经度、海拔均显著相关(P<0.05)。经度、海拔、纬度和盖度共同作用影响了地上生物量的分布格局；经度、海拔和纬度共同作用影响了物种多样性的分布格局。【结论】两河源草地地上生物量和物种多样性表现出明显的空间规律性，经度、海拔和纬度等环境因素是影响地上生物量和物种多样性空间格局的主要因子。 |
| 关键词: 阿尔泰山两河源 地上生物量 物种多样性 空间格局 环境因素 |
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| 基金项目:NSFC-新疆联合基金项目(U1803245) |
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| Spatial patterns of aboveground biomass and species diversity of grassland in the Two-river Source region in Altay Mountains |
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GUO Jianxing,YE Mao,YIN Xikai,et al
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| Abstract: |
| 【Objective】To provide data support for grassland management and maintenance as well as grassland ecological security in arid area of Northwest China,the aboveground vegetation of grassland in the Two-river Source region in Altay Mountains was investigated and the effects of site factors on aboveground biomass and species diversity of grassland were analyzed.【Method】Grassland vegetation status of 30 plots in the Two-river Source region was investigated along longitude,latitude and elevation gradients.The species diversity was analyzed by Margalef richness index,Simpson dominance index,Shannon Wiener diversity index and Alatalo evenness index in the α-diversity system.【Result】The aboveground biomass and species diversity showed clear spatial regularity,with higher aboveground biomass in the central and western regions and lower values in the southeast,while with higher species diversity in the southeast and lower diversity in the northwest.The aboveground biomass and species diversity were significantly correlated with altitude,latitude and longitude (P<0.05).The distribution pattern of aboveground biomass was affected by altitude,longitude,latitude and coverage.The distribution pattern of species diversity was influenced by altitude,longitude and latitude.【Conclusion】The aboveground biomass and species diversity in the grassland of the Two river Source region showed clear spatial regularity.Altitude,longitude and latitude were the main environmental factors affecting the spatial pattern of aboveground biomass and species diversity. |
| Key words: Two-river Source in Altay Mountains aboveground biomass species diversity spatial pattern environmental factors |
