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| Water productivity of plantations in removal land from cultivation to afforestation in Datong of Qinghai |
| Liu Sheng,He Kangning,Chang Guoliang,Li Shirong,Shi Changqing |
| College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China |
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Abstract In order to find out the water productivity of some artifical plantations in removal land from cultivation for afforestation in the cold region of Loess Plateau of east Qinghai,commuinty evapotranspiration,sample area biomass and moisture potential productivity were investigated and analyzed in Datong county in Qinghai province from 2001 to 2003,and water productivity of 11 types of artificial plantions in the removal land were studied and.The results show that,3000 trees per hm2 is a proper standard of plantions density for this region;Under current technological and economic condition,the productive efficiency of green poplar and shrub mixed forest,Asia white birch pure forest,China spruce pure forest,and Asia white birch and China spruce mixed forest with the density of 2103333 trees per hm2,which is the top of all,can serve as potential productivity standard of actual productivity of mature arbor forest;The potential productivity of green poplar and shrub mixed forest,Asia white birch and China spruce mixed forest,China spruce pure forest and Asia white birch pure forest with the density of 3 000 trees per hm2 have attained or been closed to local maximum tree productivity at present.These types of forestation models are the developing orientation of the removal land from cultivation for afforestation project and forestry ecological project.
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Received: 22 March 2005
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