YAK (BOS GRUNNIENS L.) GRAZING EFFECTS ON VEGETATION OF ALPINE MEADOW WITH POTENTILLA FRUTICOSA L. (ROSACEAE) SHRUB IN QINGHAI-TIBET PLATEAU

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	YAK (BOS GRUNNIENS L.) GRAZING EFFECTS ON VEGETATION OF ALPINE MEADOW WITH POTENTILLA FRUTICOSA L. (ROSACEAE) SHRUB IN QINGHAI-TIBET PLATEAU
	Qiao, Youming 1,2,3; Wang, Qiji 1; Wang, Wenying 4
	2009
发表期刊	POLISH JOURNAL OF ECOLOGY
ISSN	1505-2249
卷号	57 期号:4 页码:769-777
文章类型	Article
摘要	Grazing can change plant community composition and structure, which may alter the functions of the shrub meadow ecosystem. Grazing effects on Potentilla fruticosa shrub community in the headwater region of the Yellow River, which is in core area of the Qinghai-Tibet Plateau, are studied to provide adequate protection decision-making. We investigated continuous grazing and seasonal enclosure effects on P. fruticosa shrub communities. Three sites of P. fruticosa shrub comprising both continuous grazing and seasonal enclosure treatments were selected. The size of each fenced plot of P. fruticosa shrub was about 3000 m(2), the stocking rate was about 5 heads per 100 m(2) in continuous grazing treatment. Three samplings were made in each growing season of 2003 and 2004. Cover of vegetation, plant species composition and vegetation height were investigated in seven 1 x 1 m quadrates in each treatment. Above-ground biomass was measured in five 0.5 x 0.5 m quadrates. Shrub, forb, graminoid and sedge plant materials were clipped at ground level and oven-dried at 85 degrees C to a constant mass. Plant composition was affected by long term continuous grazing and changes were caused by forb species shifting. No apparent difference in species richness between the grazed and ungrazed communities over the growing months were found but the Shannon's diversity indices of the grazed communities in June and July were higher than that of the ungrazed but lower in the late August and September. Live vegetation cover was reduced by 6.7%, 7.3% and 11.5%, respectively, owing to grazing in July August and September, but not in June (P> 0.05). Forbs took up more than 50% cover of the vegetation in both grazed and ungrazed treatments. Relative cover of sedges and forbs in ungrazed treatment decreased in July, August and September, while that of graminoids increased more than 70% in the same period. Live vegetation height was reduced by 27% (2004) and 23% (2003) in late August and early September, but not in early growing season. Grazing reduced total above-ground biomass by 35%, 37% and 36% in July August and early September, respectively, and the reduction was mainly in forb biomass. Continuous grazing affects plant composition and species diversity. The quantitative characteristics of P. fruticosa communities were influenced by grazing over growing months, but the effects were offset by non-growing season grazing.; Grazing can change plant community composition and structure, which may alter the functions of the shrub meadow ecosystem. Grazing effects on Potentilla fruticosa shrub community in the headwater region of the Yellow River, which is in core area of the Qinghai-Tibet Plateau, are studied to provide adequate protection decision-making. We investigated continuous grazing and seasonal enclosure effects on P. fruticosa shrub communities. Three sites of P. fruticosa shrub comprising both continuous grazing and seasonal enclosure treatments were selected. The size of each fenced plot of P. fruticosa shrub was about 3000 m(2), the stocking rate was about 5 heads per 100 m(2) in continuous grazing treatment. Three samplings were made in each growing season of 2003 and 2004. Cover of vegetation, plant species composition and vegetation height were investigated in seven 1 x 1 m quadrates in each treatment. Above-ground biomass was measured in five 0.5 x 0.5 m quadrates. Shrub, forb, graminoid and sedge plant materials were clipped at ground level and oven-dried at 85 degrees C to a constant mass. Plant composition was affected by long term continuous grazing and changes were caused by forb species shifting. No apparent difference in species richness between the grazed and ungrazed communities over the growing months were found but the Shannon's diversity indices of the grazed communities in June and July were higher than that of the ungrazed but lower in the late August and September. Live vegetation cover was reduced by 6.7%, 7.3% and 11.5%, respectively, owing to grazing in July August and September, but not in June (P> 0.05). Forbs took up more than 50% cover of the vegetation in both grazed and ungrazed treatments. Relative cover of sedges and forbs in ungrazed treatment decreased in July, August and September, while that of graminoids increased more than 70% in the same period. Live vegetation height was reduced by 27% (2004) and 23% (2003) in late August and early September, but not in early growing season. Grazing reduced total above-ground biomass by 35%, 37% and 36% in July August and early September, respectively, and the reduction was mainly in forb biomass. Continuous grazing affects plant composition and species diversity. The quantitative characteristics of P. fruticosa communities were influenced by grazing over growing months, but the effects were offset by non-growing season grazing.
关键词	Alpine Meadow Species Composition Grazing Seasonal Enclosure Functional Group Qinghai-tibet Plateau
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	GRASSLANDS ; RESPONSES ; PRAIRIE ; DIVERSITY ; FORBS ; TEXAS
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000273093000014
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1916
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Peoples R China 2.Qinghai Univ, Dept Biol Sci, Xining 810016, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 4.Qinghai Normal Univ, Coll Life Sci, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Qiao, Youming,Wang, Qiji,Wang, Wenying. YAK (BOS GRUNNIENS L.) GRAZING EFFECTS ON VEGETATION OF ALPINE MEADOW WITH POTENTILLA FRUTICOSA L. (ROSACEAE) SHRUB IN QINGHAI-TIBET PLATEAU[J]. POLISH JOURNAL OF ECOLOGY,2009,57(4):769-777.
APA	Qiao, Youming,Wang, Qiji,&Wang, Wenying.(2009).YAK (BOS GRUNNIENS L.) GRAZING EFFECTS ON VEGETATION OF ALPINE MEADOW WITH POTENTILLA FRUTICOSA L. (ROSACEAE) SHRUB IN QINGHAI-TIBET PLATEAU.POLISH JOURNAL OF ECOLOGY,57(4),769-777.
MLA	Qiao, Youming,et al."YAK (BOS GRUNNIENS L.) GRAZING EFFECTS ON VEGETATION OF ALPINE MEADOW WITH POTENTILLA FRUTICOSA L. (ROSACEAE) SHRUB IN QINGHAI-TIBET PLATEAU".POLISH JOURNAL OF ECOLOGY 57.4(2009):769-777.