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The Relationship between Plantation Productivity and Stand Density for Pinus sylvestris var.mongolica

Yuan Zengwu(Protection Forest Research Institute of Heilongjiang Province, Qiqihar 161041.P. R. China)Ding Xianshan(Water Conservancy Bureau of Longiiang County) Li Chenglie; Zhao Yuheng; Cao Zhiwei(Protection Forest Research Institute of Heilongiiang Pro  
The relationship between plantation productivity and stand density as well as the distribution law ofthe above ground biomass tbr Pinus sylvestris var. mongolica were preliminarily analyzed. The resultsshowed that the correlation between plantation productivity and stand density was significant, and theoptimum densities ranged from 620 to 820 per hectare for middle-aged plantation of Pinus sylvestris var.mongolica. the biomass distribution law at various growth stages differed from each other.
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