Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Site Classification and Evaluation of Eucalyptus urophylla × Eucalyptus grandis Plantation in Southern Yunnan, China

Version 1 : Received: 16 February 2020 / Approved: 17 February 2020 / Online: 17 February 2020 (15:21:39 CET)

How to cite: Lu, H.; Xu, J.; Li, G.; Liu, W.; Wu, Y.; Zhang, Y.; Bai, J.; Su, G.; Jiang, C. Site Classification and Evaluation of Eucalyptus urophylla × Eucalyptus grandis Plantation in Southern Yunnan, China. Preprints 2020, 2020020246 (doi: 10.20944/preprints202002.0246.v1). Lu, H.; Xu, J.; Li, G.; Liu, W.; Wu, Y.; Zhang, Y.; Bai, J.; Su, G.; Jiang, C. Site Classification and Evaluation of Eucalyptus urophylla × Eucalyptus grandis Plantation in Southern Yunnan, China. Preprints 2020, 2020020246 (doi: 10.20944/preprints202002.0246.v1).

Abstract

Background and Objectives: The site types of Eucalyptus urophylla × Eucalyptus grandis clonal plantations in southern Yunnan were compared, aiming to provide basis for site selection and scientific plantations management. Materials and Methods: In this study, 80 standard plots were set up in the 6−9-year-old Eucalypts plantations in Pu'er City and Lincang City. Furthermore, the quantitative theory I model and canonical correlation analysis were used to analyze the relationship between dominant tree growth traits and site factors, and evaluate the growth potential of E. urophylla × E. grandis plantation. Results: The multiple correlation coefficient between 8 site factors (altitude, slope, slope level, soil thickness, slope direction, texture, soil bulk density, and litter thickness) and the quantitative growth of the dominant wood was 0.825 (P < 0.05). According to the correlation coefficient of the quantitative regression model, slope, altitude, and soil thickness were the main factors for the classification of E. urophylla × E. grandis plantations in southern Yunnan. In addition, E. urophylla × E. grandis plantations grew best downhill and mid uphill at relatively low altitude, where the soil layer was thick and composed of weathered red soil. Contrastingly, E. urophylla × E. grandis plantation growth was extremely poor in uphill sites at higher altitude, where the soil layer was thin and composed of semi-weathered purple soil. Furthermore, total N, and available B, Cu, and Zn content, as well as soil organic matter content in the soil had a great influence on the growth of E. urophylla × E. grandis. Conclusions: Nitrogen and phosphate fertilizer as well as trace elements such as B, Zn, and Cu can be properly applied in middle- and low-yield forests to promote the growth and development of E. urophylla × E. grandis plantations.

Subject Areas

E. urophylla × E. grandis; plantation; forest yield

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