| 云雾山本氏针茅草地群落恢复演替过程中的物种多样性变化动态 |
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| 引用本文： | 贾晓妮,程积民,万惠娥.云雾山本氏针茅草地群落恢复演替过程中的物种多样性变化动态[J].草业学报,2008,17(4). |
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| 作者姓名： | 贾晓妮 程积民 万惠娥 |
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| 作者单位： | 中国科学院水利部水土保持研究所,西北农林科技大学水土保持研究所,陕西,杨凌,712100;中国科学院水利部水土保持研究所,西北农林科技大学水土保持研究所,陕西,杨凌,712100;中国科学院水利部水土保持研究所,西北农林科技大学水土保持研究所,陕西,杨凌,712100 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，国家科技支撑课题，国家林业局荒漠化监测专项项目 |
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| 摘 要： | 采用样方法对云雾山干草原区本氏针茅草地群落进行长期定位监测,对未封育样地和封育5,10,15,20和25年样地群落的平均高度、盖度、多度和地上生物量以及植物多样性进行实地调查分析,以研究围栏封育对草地植物群落特征动态变化的影响.结果表明,围封10年样地群落的高度、多度以及地上生物量最大,而群落的盖度则随封育年限的增加呈显著增加趋势,在封育25年达到最大;围栏封育的不同年限也显著影响了群落的物种多样性,在围封10年样地群落具有最高的多样性指数,围封15年样地具有最高的丰富度指数,而均匀度指数则是在未封育群落中表现为最高值,最低值是在物种丰富度最高时出现.由此可见,围栏封育在一定时间范围内可以显著改善群落的特征,增加群落的生产力,对于本研究地本氏针茅群落的最佳封育期限为10～15年,但围封时间过长在草地退化方面有一定程度的影响.
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| 关 键 词： | 围栏封育 群落特征 多样性指数 丰富度指数 均匀度指数 |
Change of species diversity on typical Stipa bungeana community restoration and succession in the Yunwu Mountain |
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| JIA Xiao-ni,CHENG Ji-min,WAN Hui-e.Change of species diversity on typical Stipa bungeana community restoration and succession in the Yunwu Mountain[J].Acta Prataculturae Sinica,2008,17(4). |
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| Authors: | JIA Xiao-ni CHENG Ji-min WAN Hui-e |
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| Abstract: | The dynamic changes in community height,coverage,abundance,above ground biomass and plant diversity in Stipa bungeana typical steppe was investigated by a quadrat method.There were six treatments: Unexclosure(W),5-year old exclosure(5 a),10-year old exclosure(10 a),15-year old exclosure(15 a),20-year old exclosure(20 a),and 25-year old exclosure(25 a) plots.The 10 a plot had the highest community average height,abundance,and above ground biomass,but the community average increased with enclosure time and the 25 a plot had the highest community average coverage.Enclosure for 10 a gave the highest species diversity index in the third plots,while 15 a had the highest richness index and lowest evenness index.The highest evenness index was in the non-enclosure plot.Exclosure appears to maintain or conserve,rather than increase plant diversity in contrast to non-enclosure.In conclusion,exclosure can significantly improve grassland productivity for a time and this study has shown that the best exclosure for S.bungeana communities is 10-15 a,there would be no benefit for grassland productivity if the exclosure lasted too long. |
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| Keywords: | exclosure community characteristic richness index diversity index evenness index |
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