湖北高密度杉木人工林生长规律研究

Growth Regularity of High Density cunninghamia lanceolata plantations in Hubei

摘要:

为研究湖北省高密度杉木人工林生长规律 , 对鄂东南地区高密度杉木人工林进行标准地调查 , 获取 61块样地数 据和 183株解析木数据 , 建立了杉木单木树高、胸径和材积生长模型 , 根据拟合优度及残差指标 , 高密度杉木单木胸径和树 高生长的最优模型选择理查德模型 , 单木材积最优模型选择考尔夫模型 , 所选模型检验精度均较高 , 达到拟合效果;通过绘 制杉木胸径、树高和材积的生长曲线图 , 杉木生长量在初始阶段生长速率较大 , 单木树高和胸径生长量在第 4 a达到最大值 后逐渐下降 , 单木材积连年生长量在第 10a达到最大值;利用多元非线性回归建立关于杉木林分平均胸径、平均树高和林 分蓄积与林龄、立地指数和林分密度的林分生长模型 , 选择的林分生长模型均通过检验;利用林分蓄积量的平均生长量和 林分平均直径来确定高密度杉木林分的数量成熟龄和工艺成熟龄 , 在立地指数 16~20m和林分密度 4000~6000株/hm2 时 , 杉木的数量成熟龄和工艺成熟龄分别为 10~13a、10~11a , 与湖北咸宁地区高密度杉木造林小径级采伐年龄相符。

Abstract:

In order to study the growth regularity of high density cunninghamia lanceolata plantations in Hubei prov- ince , the authors investigate the high density cunninghamia lanceolata plantations in southeast Hubei province , obtain 61 sample plots data and 183analytical wood data , establishe the growth model of the height , DBHand volume of the single cunninghamia lanceolata . According to the fitting degree and residual index , Richard model is selected as the best model for the growth of the single height and the DBH of the high density , and kolf model was selected as the optimal model for volume growth of single tree . The test accuracy of the selected models was high and the fitting effect was achieved ; By drawing the growth curve of DBH, height and volume of cunninghamia lanceolata , the growth rate of cunninghamia lanceolata is larger in the initial stage , the growth of single tree height and DBH reaches the maximum in the 4th year and then gradually decreases , and the annual growth of single tree volume reaches the maximum in the 10th year; The stand growth models of average DBH, average height , stand volume , stand age , site index and stand density were established by multiple nonlinear regression; using the average growth of stand volume and average diameter of stand to determine the quantitative mature age and technological mature age of high-density cunninghamia lanceolata stand , the quantitative mature age and technological mature age of cunninghamia lanceolata stand are 10—13years and 10—11years respectively when the site index is 16—20m and the stand density is 4000—6000tree sper hectare , which is consistent with the small diameter age of high-density cunninghamia lanceolata plantation in xianning area of Hubei province .