| 1983-2003年浑善达克沙地中部沙丘植被在放牧条件下的比较 |
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| 引用本文： | 彭羽,薛达元,牛书丽,刘美珍,李永庚,蒋高明.1983-2003年浑善达克沙地中部沙丘植被在放牧条件下的比较[J].干旱区研究,2011,28(2):313-320. |
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| 作者姓名： | 彭羽 薛达元 牛书丽 刘美珍 李永庚 蒋高明 |
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| 作者单位： | 1. 中央民族大学 生命与环境科学学院, 北京 100081;
2. 中国科学院植物研究所 植被与环境变化重点实验室, 北京 100093 |
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| 基金项目： | National Science and Technology Promotion Project(2008BADOB05);The 111 Project,Minzu University of China(B08044) |
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| 摘 要： | 为了研究长期放牧条件下植被的变化,采用样方调查方法分析了1983-2003年浑善达克沙地中部的沙丘植被在放牧条件下的变化.期间,物种多样性、生物量和盖度在第1个10年缓慢下降,而第2个10年则加速下降,在沙丘阳坡形成了以适口性差的一年生草本植物为主的稀疏植被,阴坡以木本树木为主.且表现为木本植物的降低速度比草本植物慢....
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| 关 键 词： | 植被变化 放牧 沙地植被 生物量 全球变化 浑善达克沙地 |
| 收稿时间： | 2010-04-05; |
Vegetation Change in Response to Continuous Grazing in the Center of Hunshandak Sandland During the Period of 1983 -2003 |
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| PENG Yu,XUE Da-yuan,NIU Shu-li,LIU Mei-zhen,LI Yong-geng,JIANG Gao-ming.Vegetation Change in Response to Continuous Grazing in the Center of Hunshandak Sandland During the Period of 1983 -2003[J].Arid Zone Research,2011,28(2):313-320. |
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| Authors: | PENG Yu XUE Da-yuan NIU Shu-li LIU Mei-zhen LI Yong-geng JIANG Gao-ming |
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| Institution: | 1. College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China;
2. Natconal Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China |
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| Abstract: | The vegetation changes in response to continuous grazing in the center of Hunshandak Sandland, northern China during the period of 1983 -2003 was investigated in field. Results indicated that species diversity, biomass and coverage decreased slowly in the first 10-year period and decreased quickly in the second 10-year period, and woody plant declined more slowly than herbaceous plant. The vegetation type mainly consisted of a sparse cover of unpalatable annual grass and shrubs on the sunny slope, and woody trees on the shady slope of sandy dune. The vegetation was dominated by Artemisia intramongolica, Thalictrum squarrosum, Polygonum davaricatum on the sunny slope and by Ulmus pumila, Betula rotundifolia, Cleistogenes squarrosa on the shady slope of sandy dune in 1983. However, the dominant species were replaced by Artemisia intramongolica, Bassia dasyphylla, Corispermum heptapotamicum on the sunny slope and Prunus padus, Betula fruticosa, Spiraea aquilegifolia on the shady slope in 2003, respectively. The degradation of vegetation throughout the past 20 years was mainly caused by continuous over-grazing rather than climate changes. The number of livestock exceeded the threshold of carrying capacity of grassland, the stock density increased from 0.2 cattle and 0.4 sheep per hm2 to 0.5 cattle and 0.8 sheep per hm2, while the climate factors of precipitation and temperature did not show significant fluctuation during the period. |
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| Keywords: | vegetation change continuous grazing sandy grassland biomass global change Hunshandak Sandland |
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