Effects of Site Quality and Planting Density on Wood Assortment Rate in Chinese Fir Plantation
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Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
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Received Date:
2013-01-29
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Abstract
The continuous observation data from 30 year-old permanent sample plot was studied. The effects of site quality and stand density on small-, middle- and large-diameter timber outturn rate were analyzed. The results suggested: 1.In the plots with same planting density, the stand quality was better, every timber assortment and the maximum outturn rate appeared earlier. In A3 plot with site index of 22, the maximum outturn rate appeared 5 year earlier than that in A1 plots with site index of 16; 2.The kurtosis and maximum value of small-diameter wood outturn rate decreased with planting density increasing. The maximum value in A2 plot with site index of 20 was higher than that in E2 plot. But, planting density had little effects on middle-diameter and large-diameter timber; 3.In different period of stand development, the stand density had different effects on timber assortment outturn rate. At 30 years old stand, the timber assortment rate in plots with similar stand volume was significant different. With the planting density increasing, small-diameter timber outturn rate increased and large size timber outturn rate decreased.
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