Effects of Disturbance Intensity on the Community Characteristics and Functional Traits of Meadow Steppe at a Valley of the Lhasa River Basin

doi:10.11733/j.issn.1007-0435.2015.06.005

Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (6): 1161-1166.DOI: 10.11733/j.issn.1007-0435.2015.06.005

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Effects of Disturbance Intensity on the Community Characteristics and Functional Traits of Meadow Steppe at a Valley of the Lhasa River Basin

LUO Li-ming^1,2, MIAO Yan-jun³, PAN Ying¹, WU Jian-shuang¹, WU Jun-xi¹, YU Cheng-qun¹, ZHAO Yan¹, ZHAO Guan-feng³

1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geogriaphic Science and Natural Resources Research, Chinese Academy of Science, Beijing 100101, China;
2. Agricultural Research Institute, Tibet Academy of Agricultural and Animal Sciences, Lhasa, Tibet 850002, China;
3. Agriculture and Animal Husbandry College of Tibet University, Linzhi, Tibet 860000, China

Received:2014-11-13 Revised:2015-04-14 Online:2015-12-15 Published:2016-02-01

不同干扰强度对拉萨河谷草甸草原群落特征和功能性状的影响

罗黎鸣^1,2, 苗彦军³, 潘影¹, 武建双¹, 武俊喜¹, 余成群¹, 赵延¹, 赵贯锋³

1. 中国科学院地理与资源研究所生态系统网络观测与模拟重点实验室, 北京 100101;
2. 西藏农牧种学院农业研究所, 西藏拉萨 850002;
3. 西藏大学农牧学院, 西藏林芝 860000

通讯作者: 武建双
作者简介:陈积山(1979-),男,甘肃古浪人,助理研究员,主要从事牧草栽培及草地管理,E-mail:cjshlj@163.com
基金资助:
现代农业产业技术体系建设专项资金(CARS-35);“十二五”国家支撑计划草业及草原可持续发展关键技术研究与示范(2011BAD17B00)资助

Abstract

Abstract:

The response and adaptation of plant community characteristics and functional traits to different types and intensities of disturbance under the background of climate change are the hot topics of vegetation ecology. A field survey was carried out to study the community characteristics (community structure and species diversity) and functional traits of subalpine meadow steppe communities in piedmont alluvial fan at the valley of Xincang village, Dazi County at a dry-warm valley of the Lhasa River Basin. The effects of different intensities of disturbance in the case of grazing excluded all the year round, grazing excluded only during warm months and grazed all the year round on community characteristics (community structure and species diversity) and functional traits were investigated. Community height, aboveground biomass and dead standing materials decreased significantly with increasing the intensities of the disturbance, while community coverage had no significant changes. Excluded the disturbance intensity differences, the species diversity had no relevance with the functional traits of plant height and palatability. Diversity of all species and the palatability were no significantly correlated with disturbance intensity, reflected by the species richness, diversity index, and evenness index. However, functional traits of plant height, palatability decreased significantly with increasing the intensities of the disturbance. The effects of disturbance intensities on functional traits were more significant than species diversity. The inner link of species diversity, functional traits and ecosystem function as well as the response time and models of the three to the different intensities of disturbance should be more widely discussed in further studies.

Key words: Tibet, Meadow steppe, Species diversity, Functional traits, Disturbance intensity

摘要：

气候变化背景下,植物群落特征与功能性状对不同类型和强度人类干扰的响应与适应是植被生态学研究的热点命题之一。本文以拉萨干暖河谷达孜县新仓村沟域山麓冲积扇上的亚高山草甸草原为研究对象,采用样方调查法,探究全年禁牧、暖季禁牧、全年放牧情况下,不同干扰强度对群落特征(群落结构、物种多样性)和功能性状的影响。结果表明,群落高度、地上生物量和立枯物随干扰强度增强而降低,群落盖度差异不显著。排除干扰强度因素,物种多样性与以株高、可食性为代表的功能性状无相关性。全部物种和可食性物种的物种多样性随干扰强度变化差异不显著,即物种丰富度S、多样性指数H、均匀度指数E差异均不显著。以株高、可食性为代表的功能性状随干扰强度增强而降低,表明不同干扰强度对功能性状的影响较物种多样性更显著。未来应更广泛地探讨物种多样性、功能性状和生态系统功能的内在联系,以及3者在不同干扰强度下的响应时间和模式。

关键词: 西藏, 草甸草原, 物种多样性, 功能性状, 干扰强度

CLC Number:

S145.21

LUO Li-ming, MIAO Yan-jun, PAN Ying, WU Jian-shuang, WU Jun-xi, YU Cheng-qun, ZHAO Yan, ZHAO Guan-feng. Effects of Disturbance Intensity on the Community Characteristics and Functional Traits of Meadow Steppe at a Valley of the Lhasa River Basin[J]. Acta Agrestia Sinica, 2015, 23(6): 1161-1166.

罗黎鸣, 苗彦军, 潘影, 武建双, 武俊喜, 余成群, 赵延, 赵贯锋. 不同干扰强度对拉萨河谷草甸草原群落特征和功能性状的影响[J]. 草地学报, 2015, 23(6): 1161-1166.

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Effects of Disturbance Intensity on the Community Characteristics and Functional Traits of Meadow Steppe at a Valley of the Lhasa River Basin

不同干扰强度对拉萨河谷草甸草原群落特征和功能性状的影响

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