Growth dynamics and tree form quality of mixed Betula alnoides-Castanopsis hystrix plantation

TANG Jixin, ZHU Xueping, JIA Hongyan, ZENG Ji, GUO Wenfu, HUANG Dewei

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 97-105.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2022, Vol. 46 ›› Issue (1) : 97-105. DOI: 10.12302/j.issn.1000-2006.202009009

Growth dynamics and tree form quality of mixed Betula alnoides-Castanopsis hystrix plantation

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Abstract

【Objective】 This study explored the growth dynamics and tree form quality of a mixed Betula alnoides-Castanopsis hystrix plantation with row cluster and the same age. This was carried out to provide management reference for large-diameter timber cultivation of the mixed plantation.【Method】 An 11-year-old mixed plantation was adopted as the research object. Nine and ten sample trees of species B. alnoides and C. hystrix, respectively,were selected for stem analysis. The growth dynamics, diameter class accumulation composition, stem form, crown height ratio and stem branching ratio of different tree species in the plantation were analyzed. 【Result】 The rapid stage of diameter at breast height (DBH) growth (annual growth amount >1.0 cm, the same below) of average and dominant trees of B. alnoides occurred in the 3rd to 7th and 3rd to 9th years,respectively.The DBH rapid-growth period of the average trees of C. hystrix occurred in the 4th to 8th year, and the DBH of dominant trees of C. hystrix occurred from the 3rd year; in the 11th year, this was still on going. Tree height rapid-growth period of average and dominant trees of B. alnoides occurred during the 1st to 7th and 1st to 8th years.The rapid-growth period of tree height of average trees of C. hystrix mainly occurred in the 3rd to 7th year, while for the dominant trees of this species occurred in the 1st to 7th year. For B. alnoides, the rapid-growth periods of a single volume of average and dominant trees commenced in the 6th and 5th year, respectively;in the 11th year, this was still on going. For C. hystrix, in the first 11 years of afforestation, the growth of the single volume of average trees was still in the slow stage. From the 4th year, the total growth of DBH, tree height, and single volume of average trees for B. alnoides were significantly higher than the total growth of the average trees of C. hystrix (P<0.05). The total growth of the DBH, tree height, and single volume of the dominant trees for B. alnoides were significantly higher than the counterparts for C. hystrix from the 5th, 8th, and 5th years, respectively (P<0.05). The binary volume model (V=a×10-4×Db×Hc) demonstrated a good fitting and prediction effect on the single volume for B. alnoides and C. hystrix. For both species, the distribution of diametral class accumulation was approximately normal. In the 11-year-old mixed plantation, the ratio of excellent stem form of B. alnoides and C. hystrix was 67.71% and 97.31%, respectively, and stem branching ratio of both species was <6.0%. 【Conclusion】 During the middle and young stages, B. alnoides occurred in upper layer of the mixed plantation.In the mixed plantation, it was conducive to decent stem form quality and tree viability of B. alnoides and C. hystrix. The fast-growth period of DBH, tree height of the dominant trees of the two species were larger than the growth of average trees.

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Betula alnoides / Castanopsis hystrix / mixed plantation / growth dynamics / tree form quality

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TANG Jixin , ZHU Xueping , JIA Hongyan , et al . Growth dynamics and tree form quality of mixed Betula alnoides-Castanopsis hystrix plantation[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2022, 46(1): 97-105 https://doi.org/10.12302/j.issn.1000-2006.202009009

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论文修改过程中得到了中国林业科学研究院雷相东研究员的指导;试验林的调查得到中国林业科学研究院热带林业实验中心的贝恩光、伍俊廷、赵樟、沈伟祥、张继辉、陈琳、黄琅、马清倩、朱家民、潘国威、李建城、董诗涛等同志的大力支持。

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