陈山红心杉人工林生长过程及其模型模拟

红心杉是杉木中的优良变种，被视为杉木中的珍品，是我国南方重要的人工造林用材树种。采用树干解析方法，测定了红心杉人工林的优势木、平均木和被压木的生长过程，并用模型模拟方法对其生长过程进行了模拟。结果表明（1）红心杉在生长过程中，最大去皮胸径连年生长量为1.92 cm·a-1，各级木胸径成熟期出现的先后顺序为优势木、平均木、被压木。（2）各级木树高成熟期变化趋势与胸径相似，树高的最大连年生长量达到了1.5 m·a-1。（3）最大材积的连年生长量为0.017 6 m3·a-1，材积的成熟期与胸径和树高的成熟期差异较大。优势木材积在第18 年达最大连年生长量，成熟期在第25 年;平均木材积成熟期在第24 年;被压木材积成熟期在第25 年。（4）通过非线性回归模型模拟，确定了Richards 模型为胸径、树高和材积的最佳模拟模型，模拟效果好，精度高。（5）红心杉优势木的形数要比其它产区杉木的形数大，25 年红心杉优势木形数为0.56。红心杉是一种初期生长快的速生树种，并且达到成熟期后还可进一步培育。研究结果对红心杉的培育和人工林的经营管理提供了重要的基础数据和科学依据。Hongxin Chinese fir (Cunninghamia lanceolata cv. Hongxinshan) is an elite variant and rare treasure among Chinese firs, and it is a significant artificial afforestation timber tree species in southern China. In this study, the stem analysis method was employed to measure the growth processes of dominant, average, and suppressed trees in Hongxin Chinese fir plantations, and model simulation was utilized to replicate their growth dynamics. The results are as follows: (1) For Hongxin Chinese fir during its growth period, the maximum annual increment of debarked diameter at breast height (DBH) reached 1.92 cm·a⁻¹. The order of DBH maturation periods for trees of different crown classes is dominant trees first, followed by average trees, and then suppressed trees. (2) The variation trend of height maturation periods for trees of different crown classes is similar to that of DBH, with the maximum annual height increment attaining 1.5 m·a⁻¹. (3) The maximum annual stem volume increment was 0.0176 m³·a⁻¹. The maturation period of stem volume differs significantly from those of DBH and tree height. The maximum annual volume increment of dominant trees occurred in the 18th year, with the maturation period in the 25th year; the maturation period of average trees' stem volume was in the 24th year, and that of suppressed trees was in the 25th year. (4) Through nonlinear regression model simulation, the Richards model was identified as the optimal simulation model for DBH, tree height, and stem volume, which exhibited excellent simulation performance and high accuracy. (5) The form factor of dominant Hongxin Chinese fir trees is larger than that of Chinese fir from other producing regions, with the form factor of 25-year-old dominant Hongxin Chinese fir trees being 0.56. Hongxin Chinese fir is a fast-growing tree species with rapid early growth, and it can be further cultivated after reaching maturation. The findings of this study provide important basic data and scientific basis for the cultivation and plantation management of Hongxin Chinese fir.

搜集汇总

背景与挑战

背景概述

本数据集聚焦于红心杉人工林的生长过程，通过树干解析方法测定了优势木、平均木和被压木的胸径、树高和材积等关键生长指标，并利用非线性回归模型（如Richards模型）进行模拟分析。研究结果揭示了红心杉的生长特性，包括连年生长量、成熟期差异以及形数特征，为红心杉的培育和人工林经营管理提供了科学依据。