湖北省杉木生长模型研究

建立湖北省杉木树高、胸径、材积生长模型，为研究湖北省杉木生长情况提供参考。在湖北省3个主要杉木栽培区域的人工林中开展标准地调查，获取283 株解析木数据，根据区域特征引入哑变量，分别建立杉木树高、胸径和材积生长模型。结果显示，加入哑变量的Richards 方程拟合树高和胸径生长效果最好，未加哑变量的Richards方程拟合材积生长效果较好，模型拟合优度R2分别达到0.8376、0.7946和0.7532。对模型进行独立样本检验，含有哑变量的树高、胸径模型和未加哑变量的材积模型的预估精度均在97%以上。利用模型绘制生长曲线，湖北杉木的树高和胸径速生期在4～12年，并在第7 年生长增速达到最大值，材积在第15 年之前生长最迅速。鄂西南区域杉木的树高和胸径生长量均略高于鄂东南和鄂西北区域，鄂东南和鄂西北2 个区域之间无明显差异。

Growth models for tree height, diameter at breast height (DBH) and volume of Chinese fir (Cunninghamia lanceolata) in Hubei Province were established to provide references for the study of Chinese fir growth in this region. Standard plot surveys were conducted in plantation forests of three main Chinese fir cultivation regions in Hubei Province, and data from 283 stem analysis samples were collected. Dummy variables were introduced based on regional characteristics, and separate growth models for tree height, DBH and volume of Chinese fir were developed respectively. The results showed that the Richards equation with dummy variables achieved the best fitting performance for tree height and DBH growth, while the Richards equation without dummy variables performed well in fitting volume growth. The coefficients of determination (R²) of the models reached 0.8376, 0.7946 and 0.7532, respectively. Independent sample tests were conducted on the models, and the prediction accuracies of the tree height and DBH models with dummy variables as well as the volume model without dummy variables all exceeded 97%. Growth curves were plotted using the models, which revealed that the fast-growing stages of tree height and DBH for Chinese fir in Hubei Province occur from 4 to 12 years old, with the maximum growth rate reached at the 7th year. The volume growth was the most rapid before the 15th year. The growth increments of tree height and DBH of Chinese fir in Southwest Hubei were slightly higher than those in Southeast and Northwest Hubei, while no significant differences were observed between Southeast and Northwest Hubei.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于湖北省杉木生长模型的研究，通过收集283株解析木数据并引入哑变量，建立了树高、胸径和材积的生长模型，其中Richards方程表现最佳，拟合优度高且预估精度超过97%。研究揭示了杉木生长速生期特征，并比较了不同区域的生长差异，为杉木高效培育提供了科学参考。