Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia

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	Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia
	Cui, XY ; Wang, YF ; Niu, HS ; Wu, J ; Wang, SP ; Schnug, E ; Rogasik, J ; Fleckenstein, J ; Tang, YH
	2005-09-01
发表期刊	ECOLOGICAL RESEARCH
卷号	20 期号:5 页码:519-527
文章类型	Article
摘要	To clarify the response of soil organic carbon (SOC) content to season-long grazing in the semiarid typical steppes of Inner Mongolia, we examined the aboveground biomass and SOC in both grazing (G-site) and no grazing (NG-site) sites in two typical steppes dominated by Leymus chinensis and Stipa grandis, as well as one seriously degraded L. chinensis grassland dominated by Artemisia frigida. The NG-sites had been fenced for 20 years in L. chinensis and S. grandis grasslands and for 10 years in A. frigida grassland. Above-ground biomass at G-sites was 21-35% of that at NG-sites in L. chinensis and S. grandis grasslands. The SOC, however, showed no significant difference between G-site and NG-site in both grasslands. In the NG-sites, aboveground biomass was significantly lower in A. frigida grassland than in the other two grasslands. The SOC in A. frigida grassland was about 70% of that in L. chinensis grassland. In A. frigida grassland, aboveground biomass in the G-site was 68-82% of that in the NG-site, whereas SOC was significantly lower in the G-site than in the NG-site. Grazing elevated the surface soil pH in L. chinensis and A. frigida communities. A spatial heterogeneity in SOC and pH in the topsoil was not detected the G-site within the minimal sampling distance of 10 m. The results suggested that compensatory growth may account for the relative stability of SOC in G-sites in typical steppes. The SOC was sensitive to heavy grazing and difficult to recover after a significant decline caused by overgrazing in semiarid steppes.; To clarify the response of soil organic carbon (SOC) content to season-long grazing in the semiarid typical steppes of Inner Mongolia, we examined the aboveground biomass and SOC in both grazing (G-site) and no grazing (NG-site) sites in two typical steppes dominated by Leymus chinensis and Stipa grandis, as well as one seriously degraded L. chinensis grassland dominated by Artemisia frigida. The NG-sites had been fenced for 20 years in L. chinensis and S. grandis grasslands and for 10 years in A. frigida grassland. Above-ground biomass at G-sites was 21-35% of that at NG-sites in L. chinensis and S. grandis grasslands. The SOC, however, showed no significant difference between G-site and NG-site in both grasslands. In the NG-sites, aboveground biomass was significantly lower in A. frigida grassland than in the other two grasslands. The SOC in A. frigida grassland was about 70% of that in L. chinensis grassland. In A. frigida grassland, aboveground biomass in the G-site was 68-82% of that in the NG-site, whereas SOC was significantly lower in the G-site than in the NG-site. Grazing elevated the surface soil pH in L. chinensis and A. frigida communities. A spatial heterogeneity in SOC and pH in the topsoil was not detected the G-site within the minimal sampling distance of 10 m. The results suggested that compensatory growth may account for the relative stability of SOC in G-sites in typical steppes. The SOC was sensitive to heavy grazing and difficult to recover after a significant decline caused by overgrazing in semiarid steppes.
关键词	Aboveground Biomass Light Grazing Carbon Storage Grasslands Compensatory Growth
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	生物科学
关键词[WOS]	XILIN RIVER-BASIN ; TEMPERATE GRASSLAND ; SHORTGRASS STEPPE ; TALLGRASS PRAIRIE ; SONGNEN PLAIN ; ROOT BIOMASS ; MIXED-GRASS ; RESPONSES ; ECOSYSTEM ; NITROGEN
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:000231804600002
引用统计	被引频次：106[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/363003/1361
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 2.CAS, NW Inst Plateau Biol, Xining 810008, Peoples R China 3.Chinese Acad Sci, Inst Bot, Beijing 100044, Peoples R China 4.Fed Agr Res Ctr, Inst Plant Nutr & Soil Sci, D-38116 Braunschweig, Germany 5.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
推荐引用方式 GB/T 7714	Cui, XY,Wang, YF,Niu, HS,et al. Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia[J]. ECOLOGICAL RESEARCH,2005,20(5):519-527.
APA	Cui, XY.,Wang, YF.,Niu, HS.,Wu, J.,Wang, SP.,...&Tang, YH.(2005).Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia.ECOLOGICAL RESEARCH,20(5),519-527.
MLA	Cui, XY,et al."Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia".ECOLOGICAL RESEARCH 20.5(2005):519-527.

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