| 不同放牧压下短花针茅荒漠草原植物群落盖度空间变化 |
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| 引用本文： | 吴艳玲,陈立波,卫智军,吕世杰,运向军,孙世贤.不同放牧压下短花针茅荒漠草原植物群落盖度空间变化[J].中国草地学报,2012,34(1):12-17,23. |
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| 作者姓名： | 吴艳玲 陈立波 卫智军 吕世杰 运向军 孙世贤 |
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| 作者单位： | 1. 内蒙古农业大学生态环境学院,内蒙古 呼和浩特,010019
2. 中国农业科学院草原研究所,内蒙古呼和浩特,010010 |
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| 基金项目： | 国家公益性行业(农业)科技项目，中央级公益性科研院所基本科研业务费专项资金中国农业科学院草原研究所资助项目 |
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| 摘 要： | 在不同放牧压下,以短花针茅荒漠草原植物群落盖度为研究对象,采用GS+软件进行地统计分析,对其空间异质性进行了研究。结果表明,SA3(全年重度放牧处理区)和SA5(全年适度放牧处理区)植物群落盖度分别达到29.62%和28.58%,SA1(春季零放牧、夏季重度放牧和秋季适度放牧处理区)植物群落盖度为21.71%。家畜选择性采食践踏这一随机因素引起的空间变异在SA1处理区中最小,为0.01;SA4(春、夏重度放牧和秋季适度放牧)处理区和SA5处理区随机因素引起的空间变异接近且较大,分别为22.40和22.30。在不同放牧压组合下,植物种群盖度均存在强烈的空间自相关性,SA1、SA2(春季零放牧、夏季适度放牧及秋季重度放牧处理区)、SA3处理区空间自相关性表现强于SA4和SA5。SA1和SA3处理区分形维数较高,空间分布格局简单,空间依赖性较强,空间结构性好;SA4和SA5处理区分形维数较低,空间分布格局相对复杂,随机因素引起的异质性占有较大的比重。
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| 关 键 词： | 荒漠草原 植物群落盖度 空间异质性 地统计 |
Spatial Variation of Plant Coverage on Stipa breviflora Desert Steppe under Different Grazing Intensity |
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| WU Yan-ling
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CHEN Li-bo
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WEI Zhi-jun
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LV Shi-jie
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YUN Xiang-jun
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SUN Shi-xian.Spatial Variation of Plant Coverage on Stipa breviflora Desert Steppe under Different Grazing Intensity[J].Chinese Journal of Grassland,2012,34(1):12-17,23. |
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| Authors: | WU Yan-ling CHEN Li-bo WEI Zhi-jun LV Shi-jie YUN Xiang-jun SUN Shi-xian |
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| Institution: | 1(1.College of Ecology and Environmental Science,Inner Mongolia Agricultural University,Hohhot 010019,China;2.Institute of Grassland Research, China Academy of Agricultural Sciences,Hohhot 010010,China) |
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| Abstract: | The spatial variation of plant coverage on Stipa breviflora desert steppe under different grazing intensity was studied using software GS+ and statistical analysis method.The results showed that total plant species on tested area were 38.Plant coverage on heavy grazing area(SA3) and moderate grazing area(SA5) reached 29.62% and 28.58% respectively,while plant coverage on no grazing area in spring,heavy grazing area in summer and moderate grazing area in autumn(SA1) was only 21.71%.Spatial variability caused by random factors in SA1 was smaller than SA4 and SA5,spatial variability of which was near the maximum,22.40 and 22.30 respectively.Plant coverage in different grazing intensity had strong spatial autocorrelation,SA1,SA2 and SA3 were stronger than that in SA4 and SA5.A higher fractal dimension showed in SA1 and SA3 and the spatial distribution pattern was simple,the spatial structure was good,however,fractal dimension in SA4 and SA5 was low,spatial distribution pattern was relatively complex,spatial heterogeneity caused by random factors accounted for a large proportion. |
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| Keywords: | Desert steppe Plant coverage Spatial variability Geo-statistics |
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