Study on impact factors of large-diameter wood formation of <i>Cunninghamia lanceolata</i>in Nanling Mountains

YAN Shu; WANG Runhui; DENG Houyin; ZHENG Huiquan; HU Dehuo; WEI Ruping

doi:10.7671/j.issn.1001-411X.202005022

Journal of South China Agricultural University > 2021 > 42(2): 80-89. > DOI: 10.7671/j.issn.1001-411X.202005022

YAN Shu, WANG Runhui, DENG Houyin, et al. Study on impact factors of large-diameter wood formation of Cunninghamia lanceolatain Nanling Mountains [J]. Journal of South China Agricultural University, 2021, 42(2): 80-89. DOI: 10.7671/j.issn.1001-411X.202005022

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Study on impact factors of large-diameter wood formation of Cunninghamia lanceolatain Nanling Mountains

Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/ Guangdong Academy of Forestry, Guangzhou 510520, China

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Received Date: May 12, 2020
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
To explore the dominant ecological environment factors and stand control factors for the formation of large-diameter wood of Cunninghamia lanceolata in Nanling Mountains, investigate their influence rule and provide a theoretical guidance for cultivation and management of large-diameter wood stands of C. lanceolata in Guangdong Province.

Method
Based on the investigation of the existing large-diameter wood stands of C. lanceolata in Nanling Mountains, the site index (SI), soil integrated fertility index (I), micro-topography index (M) and geographical index (G) were extracted and the index evaluation system was established. The relationships of large-diameter wood volume (V_l), output (O_l), proportion (N_D≥26), outturn percentage (Y_l) with each index were analyzed.

Result
There were significant positive correlations of each index of large-diameter wood with SI, M (P<0.01), the correlation coefficients were 0.37−0.44 and 0.22−0.33 respectively.V_l、O_l and N_D≥26 had significant positive correlations with I(P<0.05), the correlation coefficients were 0.24−0.39.V_l and O_l showed a gentle quadratic curve trend of slowly increasing first and then slowly decreasing with the increase of reserved density (D), the correlations were significant (P<0.05). There were no significant correlations ofG, stand age (A) with each index of large-diameter wood. The large-diameter wood output at the age of 20−30 was predicted by a quantitative model: O_l= ${{\rm{e}}^{{\rm{5}}{\rm{.781 + 0}}{\rm{.004}}\;{\rm{SI + 5}}{\rm{.004}}{A^{{\rm{ - 1}}}}{\rm{ + 0}}{\rm{.261}}\ln D{\rm{ - 45}}{\rm{.151S}}{{\rm{I}}^{{\rm{ - 1}}}}}}$ (R=0.62, P<0.01).

Conclusion
SI, I, M and D are the dominant impact factors for growth of large-diameter wood in Nanling Mountains. It is benefitial for large-diameter wood formation when SI is above 18, the soil has higher porosity, moisture and nutrient contents, the micro-topography condition is a shady and concave slope below 35° in the lower part, and the reserved density is 1 100−1 300 plants·hm⁻².
- Cunninghamia lanceolata,
- large-diameter wood,
- evaluation index,
- impact factor,
- Nanling Mountains

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References (36)

References

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Study on impact factors of large-diameter wood formation of Cunninghamia lanceolatain Nanling Mountains