| 放牧与封育对沙质草地植被特征及其空间变异性的影响 |
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| 引用本文： | 罗亚勇,赵学勇,左小安,黄迎新,赵玉萍.放牧与封育对沙质草地植被特征及其空间变异性的影响[J].干旱区研究,2008,25(1):118-124. |
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| 作者姓名： | 罗亚勇 赵学勇 左小安 黄迎新 赵玉萍 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所,奈曼沙漠化研究站,甘肃,兰州,730000;中国科学院研究生院,北京,100049
2. 中国科学院寒区旱区环境与工程研究所,奈曼沙漠化研究站,甘肃,兰州,730000 |
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| 基金项目： | 国家自然科学基金项目(40601008)，中国科学院寒区旱区环境与工程研究所创新课题(O65044400)，中国科学院野外台站基金项目(1731690200015) |
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| 摘 要： | 采用经典统计和地统计学的方法,定量分析了放牧与封育沙质草地植被盖度、丰富度、平均高度、密度和Shannon-Wiener指数的变化及其对植被空间结构特征的影响。结果表明:封育沙质草地植被盖度、平均高度和Shannon-Wiener指数显著大于放牧草地(P<0.01),但两者丰富度变化不显著(P>0.05)。封育草地与放牧草地植被盖度、丰富度和Shannon-Wiener指数的变异系数分别为14.3%,24.4%,13.5%和17.8%,25.7%,21.7%,前者小于后者。在本研究尺度上,封育沙质草地植被盖度以及封育与放牧草地植被密度的空间变异规律均能较好地拟合成球状模型,封育沙质草地植被丰富度和Shannon-Wiener指数以及放牧草地植被盖度、丰富度和Shannon-Wie-ner指数的空间变异规律均能较好地拟合成指数模型。封育与放牧草地植被盖度、丰富度、密度和Shannon-Wiener指数的空间自相关度C/(Co C)分别为70.7%,56.5%,51.0%,68.7%和50.1%,73.3%,70.0%,68.9%,表明封育与放牧草地各变量均具有中等的空间相关性。封育草地所有变量半方差函数值均小于放牧草地。封育草地和放牧草地的植被盖度、丰富度、Shannon-Wiener指数变程分别是36.73 m,85.02 m,161.91 m和24.98 m,5.64 m,51.78m,前者大于后者。放牧草地植被的空间变异性强、破碎化程度高,封育草地植被的空间依赖性强、变异性弱。
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| 关 键 词： | 沙质草地 放牧 封育 植被特征 空间变异性 科尔沁沙地 |
| 文章编号： | 1001-4675（2008）01-0018-07 |
| 收稿时间： | 2006-12-28 |
| 修稿时间： | 2007-03-02 |
Effects of Livestock Grazing and Enclosure on Vegetation and Its Spatial Variability in Horqin Sandy Steppe, Inner Mongolia, China |
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| LUO Ya-yong,ZHAO Xue-yong,ZUO Xiao-an,HUANG Ying-xin,ZHAO Yu-ping.Effects of Livestock Grazing and Enclosure on Vegetation and Its Spatial Variability in Horqin Sandy Steppe, Inner Mongolia, China[J].Arid Zone Research,2008,25(1):118-124. |
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| Authors: | LUO Ya-yong ZHAO Xue-yong ZUO Xiao-an HUANG Ying-xin ZHAO Yu-ping |
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| Abstract: | Based on a series of field investigations,in this paper the characteristics of vegetation in a degenerated sandy steppe in Horqin Sandland are compared.Some traditional and geostatistical methods are used to identify the changes of the coverage,richness,mean height and density of vegetation and Shannon-wiener index and its effect on the spatial variability of vegetation in the sandy steppe.The results show that the coverage,mean height and Shannon-wiener index of vegetation in the steppe plots with enclosure are significantly higher than that under livestock grazing.Geostatistical analysis results reveal that the spatial variability of the vegetation coverage in the steppe plots with enclosure and the plant density in both of the steppes with enclosure and under livestock grazing can be well simulated with the spherical model,while the richness and Shannonwiener index of vegetation in the steppe plots with enclosure and the coverage,richness and Shannon-Wiener index of vegetation under livestock grazing can be well expressed with the exponential model.It is obvious that the variables examined show lower level of Semivariance in the plots with enclosure than that in the plot under livestock grazing.The ranges of spatial autocorrelation for the Shannon-wiener index,coverage and richness are 161.91 m,36.73 m and 85.02 m in the plots with enclosure,and 51.78 m,24.981 m and 5.64 m in the plots under livestock grazing,respectively.These reveal that livestock grazing results in an increase in spatial variability of vegetation in degenerated sandy steppe. |
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| Keywords: | Horqin Sandland livestock grazing enclosure geostatistics spatial variability semivariogram |
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