| 草原区区域气候变化对物种多样性的影响 |
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| 引用本文： | 杨持,叶波.草原区区域气候变化对物种多样性的影响[J].植物生态学报,1996,20(1):35-40. |
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| 作者姓名： | 杨持 叶波 |
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| 作者单位： | 内蒙古大学 |
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| 基金项目： | 中科院草原生态系统定位研究站及内蒙古自然科学基金 |
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| 摘 要： | 人口增长以及人类活动对环境产生的深刻影响，导致除自然规律产生的变化以外的全球或区域的气候变化，这些变化又从不同尺度影响生物多样性。本文就内蒙古草原区40年间气候变化对植物种的多样性影响作了初步探讨，结果如下：1)从1950年到1990年的40年间，草原区的气候变化造成湿润度等值线的摆动，而且向东摆动的幅度和频率都大，其中以0.3线的摆动最为明显。2)0.3线的核心区不同样方向个体数和生物量向相邻区的相对变化率(0.42，0.56)与波动方差都很显著，物种多样性指数有增大的趋势。3)湿润度等值线所处的位置正好是两个相邻湿润度区的交错区，在正常情况下，交错区植被数量特征的变化应比核心区敏感，本文所出现的异常情况，正是由于区域气候变化影响的结果。
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| 关 键 词： | 草原 物种多样性 气候变化 |
EFFECTS OF GRASSLAND REGIONAL CLIMATIC CHANGE ON PLANT SPECIES DIVERSITY |
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| Yang Chi, Ye Bo, Xing Tie-peng.EFFECTS OF GRASSLAND REGIONAL CLIMATIC CHANGE ON PLANT SPECIES DIVERSITY[J].Acta Phytoecologica Sinica,1996,20(1):35-40. |
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| Authors: | Yang Chi Ye Bo Xing Tie-peng |
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| Abstract: | Severe effects of human activities and the rapid growth of population on the environment result in the global change or the regional change, finally affecting the biological diversity at different scales. The grassland is a fragile ecosystem. Under the effects of natural factors and human activities, the grassland is very sensitive to the global or regional climatic changes. The present paper deals with the effects of regional climatic changes in 40 years on plant species diversity in Inner Mongolia. The results are as follows:1, During 40 years (from 1950 to 1990), the moisture was fluctuated due to the grassland regional climate change, and the amplitude and frequency of the fluctuation to the east were all great, especially the fluctuation of 0.3 moisture isohyet.2, In the core-zone of 0.3 moisture isohyet, the relative change rate and fluctuation variance for both the number of individuals and biomass among different sampling plots varied west-east to the adjacent area significantly, There was an increasing trend in species diversity index.3, The moisture isohyet was exactly located at ecotones. In general, the quantitative changes of the vegetation in ecotones were more sensitive than that in the core-zone. The abnormal results in this paper (The core-zone of 0.3 line was more sensitive than the ecotones of 0.13～0.3 and 0.3～0.6) were exactly caused by the effects of regional climatic change. |
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| Keywords: | Steppe Species diversity Climatic change |
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