Response of Polygonum viviparum species and community level to long-term livestock grazing in alpine shrub meadow in Qinghai-Tibet Plateau

	Response of Polygonum viviparum species and community level to long-term livestock grazing in alpine shrub meadow in Qinghai-Tibet Plateau
	Zhu, Zhi-Hong 1; Lundholm, Jeremy 2; Li, Yingnian 3; Wang, Xiaoan 1
刊名	journal of integrative plant biology
	2008-06-01
卷号	50 期号:6 页码:659-672
关键词	alpine shrub meadow biomass allocation grazing response relative species' abundances species diversity
合作状况	其它
中文摘要	grazing by domestic herbivores is generally recognized as a major ecological factor and an important evolutionary force in grasslands. grazing has both extensive and profound effects on individual plants and communities. we investigated the response patterns of polygonum viviparum species and the species diversity of an alpine shrub meadow in response to long-term livestock grazing by a field manipulative experiment controlling livestock numbers on the qinghai-tibet plateau in china. here, we hypothesize that within a range of grazing pressure, grazing can alter relative allocation to different plant parts without changing total biomass for some plant species if there is life history trade-offs between plant traits. the same type of communities exposed to different grazing pressures may only alter relative species' abundances or species composition and not vary species diversity because plant species differ in resistant capability to herbivory. the results show that plant height and biomass of different organs differed among grazing treatments but total biomass remained constant. biomass allocation and absolute investments to both reproduction and growth decreased and to belowground storage increased with increased grazing pressure, indicating the increasing in storage function was attained at a cost of reducing reproduction of bulbils and represented an optimal allocation and an adaptive response of the species to long-term aboveground damage. moreover, our results showed multiform response types for either species groups or single species along the gradient of grazing intensity. heavy grazing caused a 13.2% increase in species richness. there was difference in species composition of about 18%-20% among grazing treatment. shannon-wiener (h') diversity index and species evenness (e) index did not differ among grazing treatments. these results support our hypothesis.
英文摘要	grazing by domestic herbivores is generally recognized as a major ecological factor and an important evolutionary force in grasslands. grazing has both extensive and profound effects on individual plants and communities. we investigated the response patterns of polygonum viviparum species and the species diversity of an alpine shrub meadow in response to long-term livestock grazing by a field manipulative experiment controlling livestock numbers on the qinghai-tibet plateau in china. here, we hypothesize that within a range of grazing pressure, grazing can alter relative allocation to different plant parts without changing total biomass for some plant species if there is life history trade-offs between plant traits. the same type of communities exposed to different grazing pressures may only alter relative species' abundances or species composition and not vary species diversity because plant species differ in resistant capability to herbivory. the results show that plant height and biomass of different organs differed among grazing treatments but total biomass remained constant. biomass allocation and absolute investments to both reproduction and growth decreased and to belowground storage increased with increased grazing pressure, indicating the increasing in storage function was attained at a cost of reducing reproduction of bulbils and represented an optimal allocation and an adaptive response of the species to long-term aboveground damage. moreover, our results showed multiform response types for either species groups or single species along the gradient of grazing intensity. heavy grazing caused a 13.2% increase in species richness. there was difference in species composition of about 18%-20% among grazing treatment. shannon-wiener (h') diversity index and species evenness (e) index did not differ among grazing treatments. these results support our hypothesis.
学科主题	生物化学 ; 分子生物学
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	biochemistry & molecular biology ; plant sciences
研究领域[WOS]	biochemistry & molecular biology ; plant sciences
关键词[WOS]	mammalian herbivory ; plant-responses ; overcompensation ; accumulation ; environments ; reproduction ; defoliation ; competition ; management ; tolerance
收录类别	SCI
语种	英语
WOS记录号	WOS:000256532500004
公开日期	2009-12-04
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1212]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
作者单位	1.Shaanxi Normal Univ, Coll Life Sci, Xian 710062, Peoples R China 2.St Marys Univ, Dept Biol, Environm Studies Program, Halifax, NS B3H 3C3, Canada 3.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Zhi-Hong,Lundholm, Jeremy,Li, Yingnian,et al. Response of Polygonum viviparum species and community level to long-term livestock grazing in alpine shrub meadow in Qinghai-Tibet Plateau[J]. journal of integrative plant biology,2008,50(6):659-672.
APA	Zhu, Zhi-Hong,Lundholm, Jeremy,Li, Yingnian,&Wang, Xiaoan.(2008).Response of Polygonum viviparum species and community level to long-term livestock grazing in alpine shrub meadow in Qinghai-Tibet Plateau.journal of integrative plant biology,50(6),659-672.
MLA	Zhu, Zhi-Hong,et al."Response of Polygonum viviparum species and community level to long-term livestock grazing in alpine shrub meadow in Qinghai-Tibet Plateau".journal of integrative plant biology 50.6(2008):659-672.