南亚热带常绿阔叶林4个常见树种的生物量分配特征与异速生长模型  

Biomass Allocation and Allometric Growth Models of Four Common Tree Species in Southern Subtropical Evergreen Broad-Leaved Forest

作　　者：赵厚本[1] 周光益[1] 李兆佳[1] 邱治军[1] 吴仲民[1] 王旭[1] Zhao Houben;Zhou Guangyi;Li Zhaojia;Qiu Zhijun;Wu Zhongmin;Wang Xu(Research Institute of Tropical Forestry, CAF Beijiangyuan National Forest Ecosystem Research Station, Nanling Guangzhou 510520)

机构地区：[1]中国林业科学研究院热带林业研究所,南岭北江源森林生态系统国家定位观测研究站,广州510520

出　　处：《林业科学》2022年第2期23-31,共9页Scientia Silvae Sinicae

基　　金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2019SZ003);国家自然科学基金面上项目(31770664)。

摘　　要：【目的】分析南亚热带常绿阔叶林4个常见树种的生物量器官分配特征,构建各树种单株及不同组分(地上部分和地下部分)生物量模型,以提高其生物量估算准确性。【方法】以位于广州市的南亚热带常绿阔叶林为对象,以该地区森林历史调查数据为依据,结合研究区实际树种组成,选取黧蒴、中华锥、千年桐和华润楠4个常见树种,采用收获法测定各树种不同组分生物量,构建各树种单株及各组分的生物量模型,并探讨树高(H)和木材密度(ρ)作为第二自变量以不同形式加入模型对模型精度的影响。【结果】4个树种树叶生物量占比为5.34%~7.28%,华润楠显著低于黧蒴(P<0.05);4个树种树枝生物量占比为16.82%~24.20%,华润楠显著低于中华锥和黧蒴(P<0.05);4个树种树干生物量占比为47.22%~58.05%,中华锥显著低于其他3个树种(P<0.05);4个树种树根生物量占比为14.25%~22.25%,黧蒴和千年桐显著低于中华锥和华润楠(P<0.05);随着胸径增大,千年桐和华润楠的树叶生物量占比呈极显著下降趋势(P<0.01),4个树种的树枝生物量占比均呈上升趋势,树干生物量占比均呈下降趋势,根生物量占比和胸径之间均未表现出显著相关性;以胸径(D)为单一自变量的生物量模型具有较好拟合精度(平均R^(2)=0.947);将H以D2H形式包含在模型中,导致地上和全株生物量模型的拟合能力下降,但地下生物量拟合能力略有提升;将H以独立第二自变量包含在模型中,将增加模型的多重共线性问题;将ρ以D2ρ形式包含在模型中对单株及各组分生物量的估算精度均有所下降;将ρ以独立第二自变量包含在模型中,能略微提高估算精度。【结论】阳生树种千年桐分配较多生物量给树干,耐荫树种中华锥分配较多生物量给枝叶,耐荫树种中华锥和华润楠的根系更发达。随着胸径的增加,4个树种的树干生物量分配比例呈下降趋势而树枝的生物量�【Objective】In order to improve the accuracy of biomass estimation of southern subtropical evergreen broad-leaved forest,the biomass distribution among different organs of 4 common tree species were investigated,and the models of single plant and different biomass components(aboveground and underground)were constructed for each of the 4 species.【Method】Based on the historical data of forest survey of the southern subtropical evergreen broad-leaved forest in Guangzhou and its actual species composition,4 common tree species,Castanopsis fissa,C.chinensis,Aleurites montana and Machilus chinensis were selected to measure the biomass of single plant and different components of each tree species using the harvest method,and further to construct the biomass models of each tree species.The influences of adding tree height(H)and wood density(ρ)as second independent variables in the models on the accuracy of the models were discussed.【Result】The proportion of leaf biomass of the four 4 tree species accounted for 5.34%-7.28%,and the proportion was significantly lower of M.chinensis than of C.fissa(P<0.05).The proportion of branch biomass accounted for 16.82%-24.20%,and significantly lower of M.chinensis than of C.chinensis and C.fissa(P<0.05).The proportion of trunk biomass accounted for 47.22%-58.05%,and significantly lower of C.chinensis than of the other three species(P<0.05).The proportion of root biomass accounted for 14.25%-22.25%,and significantly lower of C.fissa and A.montana than of C.chinensis and M.chinensis(P<0.05).The proportion of leaf biomass of A.montana and M.chinensis decreased significantly(P<0.01)with the increase of DBH.With the increase of DBH,the proportion of branch biomass increased,while the proportion of trunk biomass decreased of the four species.There was no significant correlation between the proportion of root biomass and DBH.The biomass model with DBH as a single independent variable had good fitting accuracy(average R^(2)=0.947).Adding H compounded with D as one variable(D2H)in

关 键 词：南亚热带常绿阔叶林 异速生长模型 木材密度 广州市 根茎比 

分 类 号：S154.5[农业科学—土壤学] Q958.15[农业科学—农业基础科学]