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《Acta Prataculturae Sinica》 1990-01
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Researches on Main Communities of Mountainous and Alpine Grasslands in Akesai Kazak Natiionaltiy Autonomous County,Gansu Province

Liu Rongtang Li Jun Zhang Pujin (Department of Grassland Science,Gansu Agricultural University,Lanzhou,Gansu Province,China)  
By analysis of communities study,the authors have exposed briefly the characters of mountainous and alpine grasslands in Akesai Kazak Nationality Autonomous County, Gansu Province.1.There are five kinds of plant communities in all,for example,the Stipa purpurea+Leontopodium campestre+Kobresia macrantha is the major fundamental one for us to study.2.The dominance of water and heat conditions tends to be the major element of vari- ation to be studied in the sphere of community ecology.With descent or ascent of topography,plant community types often gradually change from arid to strongly arid or from cold to arid.3.Plant communities are dearly distributed vertically,and in some climax sea level communities,plant there always grow unfavorably in consequenee.4.Each commu- nity is quite different in environmental diversity.The maximum atmospheric temperature usually appears in high sea level community accordingly.The climax annual rainfall appears in the Agropyron cristatum+Stipa purpurea+Artemisia salsoloides according to our obsery tion.
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