Stand Structure and Growth Simulation Model of Chinese Pine Plantations in Shangluo
60 plots of Pinus tabulaeformis plantations were set up in Luonan County,Shangluo City,and 12 standard trees were collected for trunk analysis.A growth model for the height and DBH of Pinus tabulaeformis plantations in Luonan County,Shangluo City was established,and the growth process was analyzed and studied.The results showed that the height and DBH growth models of standard trees in Pinus tabulaeformis plantations achieved high accuracy estimates,with values of 0.999 3 and 0.991 1,respectively.Among them,the Gompers model was applied to the optimal growth of tree height,and the Richard model was applied to the optimal DBH growth.This model simulated the growth process of Pinus tabulaeformis plantation in Luonan County,Shangluo City.When the age of Pinus tabulaeformis plantations was about 9 years,the height and DBH of the trees reached a relatively fast rate of continuous growth,almost reaching or approaching the highest peak of continuous growth.This provided a corresponding theoretical basis for determining whether the Pinus tabulaeformis plantations should undergo thinning and nurturing.In terms of tree height growth,the result showed that the tree height growth was maintained at a relatively high level within 15 years.The highest values of the annual growth and average growth of Pinus tabulae ormis plantations both occurred in the period of 6a-10a.In the ninth year,the average and annual growth of the Pinus tabu-laeformis plantation reached a balanced state.During the period of 10a-24a,the average and annual growth of Pinus tabulaeformis plantations showed a downward trend compared to the previous peri-od,maintaining around 0.3 meters.After 24 years,the average and annual growth slightly increased.In terms of DBH growth,when the tree age was less than 6 years,the growth rate was faster;when 6 a＜tree age＜10 a,the continuous growth of DBH was maintained at a high level.The curve showed a clear growth peak,which rapidly decreased after the 9th year and stabilized after the 20th year,pro-viding a theoretical basis for determining the interval between tending and thinning periods.The vol-ume growth curve showed three distinct growth peaks,which occurred in the 15th year(0.001 5 m3),the 24th year(0.001 3 m3),and the 28th year(0.002 9 m3),respectively.At 15a,the growth rate reached its maximum value,providing practical guidance for determining the thinning and interval pe-riods of nurturing,and also providing theoretical support for exploring the growth patterns of Pinus tabulaeformis plantations in Shangluo.
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