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Multi-objective management models for Pinus koraiensis plantations
LI Shuang, JIANG Bo, JIN Xingji, PUKKALA Timo
Journal of Nanjing Forestry University (Natural Sciences Edition) ›› 2025, Vol. 49 ›› Issue (6) : 55-63.
PDF(1891 KB)
PDF(1891 KB)
Multi-objective management models for Pinus koraiensis plantations
【Objective】Management measurement of Pinus koraiensis plantations of different site indexes were optimized and the management models were constructed with a constraint that thinning from below, to guide the multi-objective management and formulate the multi-objective management plans of Pinus koraiensis plantations in Heilongjiang Province, so as to improve the multi-objective management level of plantations in China.【Method】Multi-attribute utility functions including wood production (WP), large log production (LLP) and cone yield (CY) were maximized using the following weights for the three management objectives: 0.25, 0.25 and 0.50 respectively. The management schedule was optimized for 41 plots of young Pinus koraiensis plantations in Heilongjiang Province, using a stand growth simulator and a differential evolution optimization algorithm. Three models were developed using stand variables as predictors: the number of trees per hectare at thinning, thinning intensity in different diameter classes (described by a parameter of the logistic function, indicating the diameter when the thinning intensity is 50%), and the average diameter at breast height (DBH) at clear-cutting.【Result】The optimal number of trees at thinning was significantly negatively correlated with the average diameter at breast height and positively correlated with the site index. The parameter of the logistic function showed a positive correlation with the average diameter at breast height and the site index. The average diameter at clear-cutting was positively correlated with the site index and negatively correlated with the number of trees. The of the three models of number of trees per hectare during thinning, thinning intensity and average diameter at breast height during clear-cutting were at 0.930, 0.798 and 0.965, respectively. The mean error of the three models was at 2.000 trees/hm2, -0.015 and 0.128 cm, and the mean of absolute errors was at 91.000 trees/hm2, 1.238 and 0.165 cm, respectively.【Conclusion】The average number of trees in the forest at thinning is positively correlated with the site index and negatively correlated with average stand DBH. The average stand DBH increases with the increase of the site index at thinning. The average stand DBH of forests with poor stand during clear-cutting is smaller than that of those with good stand.
Pinus koraiensis plantation / multi-objective management model / management guideline / Logistic function / differential evolution
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