基于3-PG模型的杉木人工林各器官生物量和LAI估算  

Estimating biomass components and LAI of Chinese fir plantation based on 3-PG model

作　　者：刘坤[1] 曹林[1] 汪贵斌[1] 申鑫[1] 曹福亮[1] 

机构地区：[1]南京林业大学南方现代林业协同创新中心,江苏南京210037

出　　处：《西北农林科技大学学报（自然科学版）》2015年第9期57-64,共8页Journal of Northwest A&F University(Natural Science Edition)

基　　金：江苏省高校自然科学研究项目(14KJB220002);江苏省科技支撑计划项目(农业部分)(BE2013443);江苏高校优势学科建设工程项目(PAPD)

摘　　要：【目的】利用3-PG模型估算江苏南部地区杉木人工林各器官生物量和叶面积指数(LAI),为杉木人工林可持续经营提供参考。【方法】以苏南丘陵地区杉木人工林为研究对象,结合当地气候和林分观测历史数据确定3-PG模型参数并运行模型,估算杉木人工林的LAI和林分不同器官生物量随林龄的变化趋势,并对预测值和观测值进行显著性分析。【结果】初始林分密度为4 600株/hm2的杉木人工林在5年时林分达到郁闭,LAI为5.5;干生物量在23年达到最大值,为74.5t/hm2;根和叶的生物量均随着林龄的增加而先增后减,根生物量在第10年达到最大值(17.5t/hm2),叶生物量在第6年达到最大值(10.25t/hm2)。【结论】3-PG模型预测结果较好,除叶生物量外,LAI、干和根生物量预测值均与观测值无显著差异。[Objective] The study used the 3-PG model to estimate biomass components and LAI of Chinese fir plantation in southern Jiangsu province to provide reference for management of Chinese fir plan- tation. [Method] Based on the Chinese fir plantation in southern Jiangsu province, this study applied local meteorological data and long-term field measurements of Chinese fir plantation to parameterize and validate the process-based 3-PG model before it was used to estimate the allocation capacity of biomass of stems, fo- liage and roots of Chinese fir plantation stands at different ages. Predicted and observed data were com- pared and significance was analyzed. [Result] With the initial stand density of 4 600 trees/hm2 ,Chinese fir plantation reached its maximum close canopy with LAI of 5.5 at the age of 5 years,and the stem biomass reached its highest value of 74.5 t/hm^2 at the age of 23 years. Both roots biomass and foliage biomass in- creased before decreasing as the increase of stand age. Roots biomass reached the maximum of 17.5 t/hm^2 at the age of 10 years,while the maximum foliage biomass of 10.25 t/hm^2 occurred at the age of 6 years. [Conclusion] 3-PG model had good prediction results. There was no significant difference between the pre- dicted and observed LAI,roots and stem biomass except foliage biomass.

关 键 词：杉木 3-PG模型 生物量 叶面积指数(LAI) 生长规律 

分 类 号：S711[农业科学—林学]