| 东祁连山杜鹃灌丛草地物种多样性特征及干扰因子 |
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| 引用本文： | 柳小妮,张德罡,孙九林,曹文侠,蒲小鹏,徐长林. 东祁连山杜鹃灌丛草地物种多样性特征及干扰因子[J]. 草地学报, 2007, 15(1): 13-19. DOI: 10.11733/j.issn.1007-0435.2007.01.003 |
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| 作者姓名： | 柳小妮 张德罡 孙九林 曹文侠 蒲小鹏 徐长林 |
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| 作者单位： | 1. 甘肃农业大学草业学院, 兰州, 30070;2. 中科院地理科学与自然资源研究所, 北京, 100101 |
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| 基金项目： | 甘肃省教育厅科研项目 , 中国农科院合作项目 |
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| 摘 要： | 在海拔3080~3610 m范围内,研究东祁连山杜鹃灌丛在不同海拔高度的物种多样性特征及砍伐、滑坡干扰对其影响。结果表明:Shannon-Wiener指数随海拔高度先升后降,最高值出现在3330 m处,为2.537,最低值则出现于海拔最高的3610m处,为2.109,两个峰值相差0.428,下降幅度为16.9%;丰富度指数与之相似,以3330m最高,为3.672,在3610m处最低,为2.2,峰值相差1.472,下降幅度为40.1%;均匀度的变化规律有所不同,最高值出现在海拔3400m处,为0.793,最低值则出现于较低的3160m处,为0.725,两个峰值相差0.068,仅下降8.6%,变幅很小;总体来看,在3230~3400m之间,群落的物种多样性、丰富度和均匀度均较高;较高和较低海拔地段,物种多样性较低,丰富度和均匀度相应偏低;群落在自然应力的作用下发生滑坡后,其Shannon-Wiener指数、丰富度和均匀度均有较大程度下降,比对照分别下降46.9%、34.2%和38.0%,差异极显著;砍伐的情形则与滑坡大不相同,群落被砍伐两年内,其Shannon-Wiener指数、丰富度和均匀度均无显著差异。
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| 关 键 词： | 东祁连山 杜鹃 灌丛 物种多样性 干扰 |
| 文章编号： | 1007-0435（2007）01-0013-07 |
| 收稿时间： | 2006-03-14 |
| 修稿时间： | 2006-11-28 |
Plant Diversity and Disturbance on the Rhododendron Shrub Grassland of Eastern Qilian Mountains |
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| LIU Xiao-ni,ZHANG De-gang,SUN Jiu-lin,CAO Wen-xia,PU Xiao-peng,XU Chang-lin. Plant Diversity and Disturbance on the Rhododendron Shrub Grassland of Eastern Qilian Mountains[J]. Acta Agrestia Sinica, 2007, 15(1): 13-19. DOI: 10.11733/j.issn.1007-0435.2007.01.003 |
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| Authors: | LIU Xiao-ni ZHANG De-gang SUN Jiu-lin CAO Wen-xia PU Xiao-peng XU Chang-lin |
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| Affiliation: | 1. College of Forage Industry, Gansu Agriculture University, Lanzhou, Gansu Province 730070, China;2. Institute of Geographical Sciences and Natural Resources, CAS, Beijing 100101, China |
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| Abstract: | The plant diversity features of rhododendron shrub grassland in Eastern Qilian Mountains and the disturbance caused by deforestation and landslip were studied.Results indicate that: The Shannon-Wiener index of community rose along with the mountain above sea-level altitude and then dropped even though the height continued.The highest value was 2.537 at 3330m above sea level on the Qilian Mountains;the lowest value was 2.109 at 3610m,the summit in the research district,a decrease by(16.9%),and the difference of Shannon-Wiener index between the two peaks was 0.428.The richness of community showed a similar trend,i.e.,the highest value was 3.672 at 3330 m above sea level and the lowest value was 2.2 at 3610m above sea level.The difference between the two peaks was 1.472,a decrease by 40.1%.However,the evenness of plant community showed a different trend.The highest value was 0.793 at 3400m above sea level and the lowest value was 0.725 in lower area at an altitude of 3160m.The discrepancy was a mere 0.068 unit,a deduction of 8.6%.In general,the Shannon-Wiener index of richness and evenness of community were relatively higher in the area ranged from altitude 3230 m to 3400 m above sea level,and the indices were relatively lower in the areas below or above this altitude range.The Shannon-Wiener index,richness and evenness of community greatly decreased with landslip occurred and the decreases were 46.9%,34.2% and 38.0% respectively,compared with those of the check(P<0.01).However,the plant diversity feature of community showed a totally different situation after the shrub was cleared within 2 years.Compared with the control,the Shannon-Wiener index,richness and evenness of community did not show any significant differences. |
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| Keywords: | Eastern Qilian Mountains Rhododendron Shrub land Plant diversity Disturbance |
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