| 放牧强度对青藏高原东部高寒草甸植物群落特征的影响 |
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| 引用本文： | 仁青吉,武高林,任国华. 放牧强度对青藏高原东部高寒草甸植物群落特征的影响[J]. 草业学报, 2009, 18(5): 256-261. DOI: 10.11686/cyxb20090533 |
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| 作者姓名： | 仁青吉 武高林 任国华 |
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| 作者单位： | 1.甘肃省甘南州草原工作站,甘肃 合作 747000;2.西北农林科技大学 中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100; 3.兰州大学干旱与草地生态教育部重点实验室,甘肃 兰州730000 |
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| 基金项目： | 国家自然科学基金项目，国家天然草原退牧还草工程玛曲县退牧还草试点工程项目 |
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| 摘 要： | 通过对青藏高原东部玛曲高寒嵩草草甸植物群落在3个放牧梯度下的特征比较,分析了该类草甸主要群落特征对放牧强度差异的响应。结果表明,随着放牧强度的增加,草甸群落的高度、盖度和地上生物量都呈现显著降低的趋势;草甸群落中优势种群的莎草科和禾本科物种的优势度逐渐降低,被一些杂草类物种(黄帚橐吾和火绒草)所取代。放牧强度的增加,导致了禾草类和莎草类功能群生物量比例的显著降低,及豆科类、毒草类和杂草类功能群生物量比例的显著增加。中度放牧下的草甸群落表现出了最高的物种丰富度指数、多样性指数和均匀度指数,排序为中牧草甸>重牧草甸>禁牧草甸。随着放牧干扰强度的增加,高寒草甸群落将经历一个由上层的莎禾草类为主的草甸群落→上层莎禾草类＋中层杂草类共存的草甸群落→中下层杂草类为主的草甸群落的演替过程。
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| 关 键 词： | 放牧强度 高寒草甸 群落结构 青藏高原 |
| 收稿时间： | 1900-01-01; |
Effect of grazing intensity on characteristics of alpine meadow communities in the eastern Qinghai-Tibetan Plateau |
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| REN Qing-ji,WU Gao-lin,,REN Gou-hua (.Grassl, Work Station of the Gannan Tibetan Autonomous State of Gansu Province,Hezuo ,China,.Northwest Sci-Tech University of Agriculture , Forestry State Key Laboratory of Soil Erosion , Dryl, Farming on the Loess Plateau. Effect of grazing intensity on characteristics of alpine meadow communities in the eastern Qinghai-Tibetan Plateau[J]. Acta Prataculturae Sinica, 2009, 18(5): 256-261. DOI: 10.11686/cyxb20090533 |
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| Authors: | REN Qing-ji WU Gao-lin REN Gou-hua (.Grassl Work Station of the Gannan Tibetan Autonomous State of Gansu Province Hezuo China .Northwest Sci-Tech University of Agriculture Forestry State Key Laboratory of Soil Erosion Dryl Farming on the Loess Plateau |
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| Affiliation: | 1.Grassland Work Station of the Gannan Tibetan Autonomous State of Gansu Province, Hezuo 747000, China; 2.Northwest Sci-Tech University of Agriculture and Forestry State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China; 3.Key Laboratory of Arid and Grassland Ecology of Ministry of Education of Lanzhou University, Lanzhou 730000, China |
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| Abstract: | A comparative study on community characteristics with different grazing intensitie was conducted in alpine meadows of the eastern Qinghai-Tibetan Plateau(Maqu county,Gansu province).With increased grazing intensity,vegetation height,total cover and above-ground biomass all showed a significant decrease.The importance of species of Cyperaceae and Gramineae families fell and their dominances were replaced by some forbs species(Ligularia virgaurea and Leontopodium leontopodioides).For plant functional groups,t... |
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| Keywords: | grazing intensity alpine meadow community structure Qinghai-Tibetan Plateau |
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