Effect of microenvironmental quantitative regulation on growth of Korean pine trees planted under secondary forest |
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| Authors: | Jian Cong Hai-Long Shen Wen-Hua Yang Shao-Hui Fan Qun Zhang |
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| Institution: | (1) Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenhe District, Shenyang, 110016, Liaoning, China;(2) Faculty of Life Science, Northeast Forestry University, Harbin, 150040, China;(3) Swiss Federal Research Institute WSL, Zurcherstrasse 111, 8903 Birmensdorf, Switzerland; |
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| Abstract: | Korean pine (Pinus koraiensis) and broadleaved mixed forest in Northeast China has been changed regressively into secondary forest with almost no conifers.
Planting Korean pine trees under the canopy of secondary forest is a feasible approach for recovering Korean pine and broadleaved
mixed forest. For establishing an effective growth promotion method for under-canopy planted young Korean pine trees, two
stands were selected as the experiment plots, Stand A (planted in 1989) and Stand B (planted in 1982), and an experiment of
microenvironment regulation was conducted relying mainly on Opening degree (K=1, K=1.5, K=2, CK) in 2004. The results were
shown that the adjustment had promoted growth of diameter and height of Korean pine planted in Stand A and Stand B, and had
a significant influence on the growth rate of basal diameter, diameter at breast height and height in the two growth stands.
The four years periodic increment of mean diameter and height of Korean pine planted in 1989 and in 1982 after regulation
in K=1 level were 63.4% (D0) and 82.7% (H), 64.8% (D1.3) and 69.7% (H) higher than that of control respectively. Quantitative regulation had significant influence on specific leaf
area of Korean pine planted in 1989, and the current year specific leaf area (SLA) was lager than perennial year SLA. Quality
indexes of natural pruning capacity, normal form quotient and crown size was not significantly changed but shown a positive
tendency. The regulation scheme of Opening degree K=1 might be proper for adjusting the microenvironment of Korean pine trees
planted under the canopy of secondary forest when the Korean pine trees were in the growth period of 15 to 26 years old in
the experiment region. |
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| Keywords: | Pinus koraiensis under canopy planting microenvironment quantitative regulation opening degree |
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