| 拉萨河谷山地灌丛草地物种多样性随海拔升高的变化特征 |
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| 引用本文： | 罗黎鸣,苗彦军,武建双,潘影,土艳丽,余成群,赵延,赵贯锋,武俊喜.拉萨河谷山地灌丛草地物种多样性随海拔升高的变化特征[J].草业学报,2014,23(6):320-326. |
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| 作者姓名： | 罗黎鸣 苗彦军 武建双 潘影 土艳丽 余成群 赵延 赵贯锋 武俊喜 |
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| 作者单位： | 1.西藏大学农牧学院,西藏 林芝 860000;2.中国科学院地理科学与资源研究所 生态系统网络观测与模拟重点实验室拉萨高原生态试验站,北京 100101;3.西藏自治区高原生物研究所,西藏 拉萨 850001 |
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| 基金项目： | 国家科技支撑计划项目，“西部之光”人才培养计划项目，西藏生态专项(Z2012C07G03)资助。 |
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| 摘 要： | 以拉萨河谷达孜县新仓村沟域的山地灌丛草地为研究对象,采用样方调查法探究了随海拔升高(3992~4940 m)灌丛草地群落结构、物种多样性、功能性状Rao指数的变化特征。结果表明,1)随海拔升高灌丛生物量和盖度呈先增加后降低的变化趋势,但草地盖度(71±14)%和生物量(49.18±19.17) g/m2变化不明显(P>0.05);2)随海拔升高群落物种组成存在差异,但共优种高山嵩草(0.591±0.034)和青藏苔草(0.326±0.061)的优势度无显著变化(P>0.05);3)随海拔升高草地物种丰富度、Shannon-Wiener多样性指数呈先增加后降低的“单峰曲线”变化特征;4)以株高测算的草地群落功能性状Rao指数随海拔升高而降低。物种丰富度、功能性状以及地上净初级生产力沿海拔升高的变化特征存在差异,为维持高原河谷山地灌丛草地的生态安全,未来应重视三者相互关系及其生态学机制的相关研究。
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| 关 键 词： | 西藏 海拔梯度 物种多样性 功能性状 山地灌丛草地 |
| 收稿时间： | 2014-04-03 |
Variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in a Lhasa River basin valley |
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| LUO Li-ming,MIAO Yan-jun,WU Jian-shuang,PAN Ying,TU Yan-li,YU Cheng-qun,ZHAO Yan,ZHAO Guan-feng,WU Jun-xi.Variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in a Lhasa River basin valley[J].Acta Prataculturae Sinica,2014,23(6):320-326. |
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| Authors: | LUO Li-ming MIAO Yan-jun WU Jian-shuang PAN Ying TU Yan-li YU Cheng-qun ZHAO Yan ZHAO Guan-feng WU Jun-xi |
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| Institution: | 1.Agricultural and Animal Husbandry College of Tibet University, Linzhi 860000, China;2.Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Science and Natural Resources Research, Beijing 100101, China;3.Tibet Plateau Institute of Biology, Lhasa 850001, China |
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| Abstract: | A field survey was carried out to measure the variation in the biodiversity of montane shrub grassland communities along an altitudinal gradient in the Xincang village valley, Taktse County in the Lhasa River basin. Community assembly and functional trait diversity were assessed using the Rao index. The aboveground biomass and total coverage of shrubs initially increased and then decreased with increasing altitude. Variation in aboveground biomass (49.18±19.17 g/m2) or total coverage (71%±14%) for alpine meadows among plots along the altitudinal gradient was not high. Species composition indices varied along the altitudinal gradient; Kobresia pygmaea (0.591±0.034) and Carex moorcroftii (0.326±0.061) were the two most dominant species. Species diversity of the shrub-grassland community revealed a unimodal variation pattern along the altitudinal gradient; both species richness and the Shannon-Wiener diversity index initially increased and then decreased from 3992 to 4940 m. Conversely, the Rao index for plant height decreased with increasing altitude. Being the most important factor in the ecological security of the Lhasa river basin, montane shrub grassland should be afforded more scientific attention, particularly the interactions between and the mechanisms underlying species richness, functional traits and ecological processes. |
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| Keywords: | Tibet altitudinal gradient species diversity functional trait montane shrub grassland |
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