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| Research on Ecological Restoration of Alpine Steppe along Qinghai - Tibet Railway |
| ZHAO Yan-zhou，XUE Chun-xiao，YANG Yin-hai |
| Northwest Research Institute Co. Ltd of CREC, Lanzhou,Gansu 730000,China |
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Abstract Research purposes ： The alpine steppe ecological zone in the Qinghai 一 Tibet plateau along the Qinghai - Tibet railway is in the alpine arid climate zone featured with the simple ecological structure，shorter growing period of the plant, easy degradation of the plant by interference and long process of nature recovery. It is difficult to restore its ecology due to the unique，original and weak features mentioned above. During the railway construction and operation, it is inevitable to carry out excavation and filling construction to produce the engineering wound，resulting in a number of frozen soil engineering and environmental problems, such as the degradation of permafrost, grassland desertification, frost damage of railway subgrade and loss of water and soil. So it is necessary to study the technology for the regional ecological restoration. In this paper, the introduction is given to the research on the appropriate technology for the ecological restoration along the railway for providing the technical support to the restoration work.
Research conclusions ： (1 ) The seed - nutriment - soil sacks technology presented in this paper is available for the ecological restoration of alpine steppe along the railway. (2)The plant species of the Poa ciymophia, Elymus nutans and Elymus sibiricus were used in the tests，getting the good joint effects. The stable phytobiocoenose was form in the second year after the project. The amounts of seed plant of Poa ciymophia，Elymus nutans and Elymus sibiricus were separately 0.5g，4g and 4g. (3) Adding the water - absorbent polymer and organic fertilizer in the planting matrix got obvious effect. (4)The research results could be applied in ecological and geological disaster prevention and control projects for the transportation construction in permafrost regions of the Tibetan plateau.
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Received: 19 November 2012
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2013, Vol. 30 
