Relationship between the botanical composition and grazing intensities in Xilingoule grasslands, Inner Mongolia
YI Ru-han1, Ichiroku Hayashi2, Toru Nakamura3, Masas Shiyomi4
1. Environmental Engineering Department, College of Science and Engineering, Jinan University, Guangzhou 510632, China; 2. Sugadaira Montane Research Center, University of Tsukuba, Nagano 1278-2943, Japan; 3. Institute of Agriculture and Forestry, University of Tsukaba, Tsukuba 305-8572, Japan; 4. Senba-cho 168-35. Mito 310-0851 Japan
A study on the botanical composition, aboveground biomass and stand species diversity was carried out ingrasslands under different grazing intensities in the Xilin River basin in Inner Mongolia. The grassland near the village weremore intensively grazed than the stands away from the village. Lightly grazed stands were basically dominated by Leymuschinensis and Stipa grandis. By contrast,Cleistogenes squarrosa dominated the intensively grazed stand. The biomass variedfrom 303 g·m-2 in lightly srazed stand to 127.3 g·m-2 in intensively grazed stand. Stand species diversity indices were 3.13-3.64 irrespective of grazing pressure. The stand quality under varying pasture conditions was evaluated using a standquality index (SQI). The SQIs were 278 for an intensively grazed stand and 667 for a lightly grazed stand. which was located4km away from the village. Thirteen years of enclosure improved the SQI of the grassland from 420 to 624.
[1] Hayashi I,Jiang S and Nakamura T.1988.Phytomass production of grassland in Xilin River Basin,Xilingole,Inner Mongolia,China [J].Bull.Sugadaira Montane Res.Cen.,9:19-31.
[2] Jiang S and Li B.1988.Natural environments of Baiynxile,Xilinhot,Inner Mongolia [J].Bull.Sugadaira Montane Res.Cen.,9:1-8
[3] Kawanabe Y,Nan,T and Oshida Z,et al.1996.Vegetational change of desertificated grassland during 15-20 years preservation in Inner Mongolia,China [J].The 8th AAAP Animal Science Congress Proceedings,1:270-271.
[4] Kawanabe S,Nan Y and Oshida T,et al.1998.Degradation of grassland in Keerqin sand land,Inner Mongolia,China [J].Grassland Science,44:1 09-114.
[5] Li B,Yang S P and Li A.1998.The vegetation of the Xilin River basin and its utilization [J].Research on Grassland Ecosystem,3:84-183.
[6] Li Y.1989.Impact of grazing on Aneurolepidium Chinense steppe and Stipa grandis steppe [J].Acta Oecologica,10:31 1-46.
[7] Li Y.1993.Biodiversity features of the main steppe communities in Inner Mongolia and their relations to climate and grazing [J].Chinese Biodiversity,1:77-82
[8] Nakamura T,Go T and Hayashi Y,et al.1998.Experimental study on the effects of grazing pressure on the fioristic composition of a grassland of Baiyinxile,Xilingole,Inner Mongolia [J].Vegetation Science,15:139-145.
[9] Nakamura T,Go T,and Wu yu-na,et al.2000.Effect of grazing on the fioristic composition of grasslands in Baiyinxile,Xilingol,lnner Mongolia [J],Grassland Science,45:342-336
[10] Ohkuro T and Nemoto M.1996.Vegetation degradation process caused by sheep grazing at sandy grassland in semi-arid region of Northeast China [J].Environmental Information Science,10:31-36.
[11] Ohkuro T and Nemoto M.1997.Vegetation and soil restoration process by grazing control at decertified sandy grassland in semi-arid region of Northeast China [J].Jpn.Ecol.,46 (3):245-256.
[12] Okamoto C,Nakamura,M and Kabata K,et al.2000.Seasonal changes in the aboveground phytomass of a Stipa baicalensis community in Northeast China [J].Grassland Science,46:217-222.
[13] Shannon C E and Weaver W.1963.The mathematical theory of communication [M].Urbana and Chicago:University of Illinois Press.1-125.
[14] Takatsuki S and Zhao J.1999.Grazing effects on a grassland community and a plant defence guild in Hulunbeier,Northern China [J].Biosphere Conservation,2:59-64.
[15] Zhong Y K and Bao Q H.1990.Successional regularity of artificial Aneurolepidium chinense grassland under effect of mowing [A].In:IMGERS of Academia Sinca.Reports from the Inner Mongolia Grassland Ecosystem Research Station of Academia Sinica [M].Beijing.Science Press.192-197.
[16] Wu yun-na,Nakamura T and Hayashi I.1999.Species diversity and phytomass production of the grassland in Inner Mongolia [J].Grassland Science,45:140-148.*
[17] Xiao X,Ojima D S and Ennis C A.,et al.1997.Estimation of above ground biomass of the Xilin River basin,Inner Mongolia,using landsat TM imagery [J].Grassland Ecosystem Study,5:130-138.
