| 摘要: |
| 【目的】灌木是森林生产力的重要组成部分，探索北亚热带地区常绿阔叶林林下灌木生长模型，为森林生物量及其碳储量估算奠定基础。【方法】在安徽南部查湾自然保护区,选取4种常见林下灌木树种（老鼠矢、乌药、朱砂根和香桂），通过野外实测获得地径（D）、树高（H）、地径平方乘树高（D2H）、冠径树高乘积（CH）、植冠面积（AC）和植冠体积（VC）等模型参数，拟合生物量模型，基于独立检验数据对模型进行验证，获得生物量最优模型。【结果】各灌木树种单器官及全株生物量模型以D2H和CH为自变量都具有较高的拟合优度（0.815～0.983）和较小的标准误（SEE）。不同灌木树种、不同器官之间的生物量最优模型选用方程均存在一定差异，以幂函数、二项式方程为主，且模型检验精度均较高（总相对误差（RS）＜30%，平均相对误差绝对值(RMA)＜20%）。模型的普适性研究表明，叶、枝和根生物量最优通用模型为W=a+bX+cX2（X为D2H（叶、枝）或CH（根）），拟合效果较优；而全株生物量最优模型为W=1.423 2(D2H)0.832 4，拟合指数（FI）＝0.960，适用于4种灌木叶、枝、根和全株生物量的估算，但根系通用模型的估算精度低于叶、枝与全株的最优生物量通用模型。【结论】基于生物量模型可以精准地估算亚热带地区的灌木生物量。 |
| 关键词: 灌木 生物量模型 通用模型 亚热带 |
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| 基金项目:国家“973”计划项目(2012CB416905)；国家自然科学基金项目（31370626）；安徽省自然科学基金项目（1408085QC69） |
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| Biomass models for shrubs under evergreen broad-leaved forest in north subtropics |
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XU Chonghua,FAN Wei,CUI Jun,et al
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| Abstract: |
| 【Objective】The shrub layer is an important part of stand productivity in forest ecosystems.This study investigated allometric models for biomass estimation of shrubs to provide basis for accurate estimation of forest biomass and related carbon stock. 【Method】Four common shrub trees (Symplocos stellaris,Lindera aggregate,Ardisia crenata,and Cinnamomum subavenium) at Zhawan Natural Reserve in southern Anhui were selected and descriptive parameters of D (basal diameter),H (total plant height),D2H (square of basal diameter×height),CH (mean of crown diameter×H),AC (means crown area),VC (means plant crown volume),and AC×H were obtained through filed investigation to fit biomass models. Models were also validated based on independent test data.【Result】The biomass models of both single organ and whole plant with D2H and CH as independent variables had higher goodness of fit (0.815-0.983) and lower standard error of estimation (SEE).The biomass equations differed between different organs and different shrub species,and the optimal models mostly followed power function and binomial with high examination precision of RS＜30% and RMA＜20%.The universality analysis of the models for these four shrubs indicated that the optimal universal biomass model for leaf,branch and root was W=a+bX+cX2 with superior fitting effect,while the best model for entire plant biomass was binomial (W=1.423 2×(D2H)0.823 4,FI＝0.960).The universal model can apply to biomass estimation of leaf,branch,root and whole plant for the four shrub trees,but the estimate accuracy of universal model was lower for root biomass than for leaf, branch and whole biomass.【Conclusion】The allometric equations obtained is a valid and nondestructive method to accurate estimation of shrub biomass in subtropical forest ecosystems. |
| Key words: shrub biomass model universal model subtropical forest |
