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Growth and Wood Character Variation of Populus pseudo-cathyana×Populus deltoids Plantation with Different Thinning Intensity in Northeast China
Jing XU, Ying CUI, Fusen WANG, Kailong LI, Guanzheng QU, Xiyang ZHAO
PDF(656 KB)
PDF(656 KB)
Growth and Wood Character Variation of Populus pseudo-cathyana×Populus deltoids Plantation with Different Thinning Intensity in Northeast China
)To explore the effects of different thinning intensity on the growth and wood properties of Populus pseudo-cathyana×Populus deltoids plantation， and to provide a theoretical basis for cultivating high-quality industrial resources of poplar in northeast China， the 18-year old Populus pseudo-cathyana×Populus deltoids was used as the material， and the initial plant row spacing of 2 m×3 m was used as the control， and the thinning treatments of 3 m×3 m， 6 m×3 m， 4 m×6 m were set up. The growth characteristics（tree height， DBH， 2 m diameter， crown width） and wood properties（basic density， fiber length， fiber width， hemicellulose content， cellulose content， semi-cellulose content， lignin content） of the experimental forest were measured in the 5th year after thinning， and the volume per tree and the storage per unit area were calculated using tree height and DBH. The results of variance analysis showed that all indexes were significantly different except basic density （P<0.01）. The results of mean analysis showed that the mean values of each growth index and lignin content reached the maximum when the row spacing was 6 m×3 m， and the other wood indexes reached the maximum when the row spacing was 4 m×3 m or 6 m×4 m. The variation of phenotypic coefficient of each index ranged from 3.35% to 29.87%. In addition to the basic density， the repetitive force of each index exceeded 0.590. The results of correlation analysis showed that there were significant positive correlations among the growth indicators（0.690<r<0.993）， but the correlation between wood traits and growth traits was weak. It was found that Qi reached the maximum when the row spacing was 6 m×3 m， 4 m×6 m and 4 m×6 m， respectively， by using growth traits， wood traits and combined growth and wood traits as evaluation indexes. Thinning might promote the growth of stand and improve the wood property of the forest， and the wood property and the comprehensive improvement effect of the forest growth and wood would be better when the row spacing of the trees is 4 m×6 m. The best growth results were obtained when the row spacing was 6 m×3 m. Therefore， suitable thinning intensity might be selected according to different cultivation objectives for the cultivation of poplar high quality industrial resources in northeast China in the future.
Populus pseudo-cathyana×Populus deltoids / thinning intensity / growth traits / wood character
S792.113
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