南亚热带红锥人工林生物量分配与碳氮磷积累特征

为了探究南亚热带红锥人工林的碳氮磷积累及其分配特征，为区域尺度生物量和碳储量的估算和碳汇潜力的评估提供基础数据，通过样地标准木生物量实测和实验室分析结合的方法，研究了广东省乐昌林场15年林龄红锥人工林的生物量分配和碳氮磷积累特征。结果表明：(1)随着胸径(D)的增加，红锥整株生物量和各器官生物量呈增加的趋势，器官生物量的大小排序依次为干、皮、枝、叶和根。(2)采用D和D²H建立的红锥生物量方程差异很小，2个整株生物量模型y=0.490 5 D2.082 8和y=329.01(D²H)^{0.830 4}拟合度高。(3)红锥根的C含量显著低于叶、枝、干和皮(P <0.05)，而红锥叶的N和P含量显著高于枝、干、根和皮。(4)红锥各器官C积累量排序为干>根>皮>叶>枝；N积累量排序为叶>枝>干>根>皮；P积累量排序为皮>枝>根>叶>干。综上，红锥人工林碳氮磷积累量较大且具有较高的养分利用效率，在南亚热带人工林经营和林分改造中，选择如红锥阔叶树种造林可获得...

Characteristics of biomass allocation and carbon, nitrogen and phosphorus accumulation in the south subtropical Castanopsis hystrix plantation

To investigate the carbon, nitrogen and phosphorus accumulation and distribution characteristics, and provide some basic data for good management and C sink potential of Castanopsis hystrix plantations in the south subtropical region, in this study, we selected C. hystrix plantations in Lechang Forest Farm, Guangdong Province to analyze the biomass allocation and C, N, P accumulation characteristics through the method of field measuring biomass of sample trees combined with lab analysis. The results showed that: (1) With the increase of DBH, the biomass of the whole plant and organs increased, and the order of organs biomass was trunk > bark > branch > leaf > root. (2) There was little difference between the biomass equations of organ biomass established by DBH and D²H, and the fitting degree of the two whole-tree biomass models, Y = 0.490 5 D^{2.082 8} and Y = 329.01 (D²H)^{0.830 4}, was high. (3) The C concentration in the roots of C. hystrix was significantly lower than that in the leaves, branches, trunks and barks (P < 0.05), while N and P concentrations in the leaves were significantly higher than those in the branches, trunks, roots and barks. (4) The order of C accumulation in different organs was trunks > roots > barks > leaves > branches; N accumulation was leaves > branches > trunks > roots > barks; P accumulation was barks > branches > roots > leaves > trunks. To sum up, the C, N and P accumulation and utilization efficiency of C. hystrix plantations were relatively higher in the south subtropical region. In the business and stand transformation of the south subtropical plantations, if C. hystrix broad leaved tree species of afforestation is chosen, higher coniferous forest productivity and C sequestration benefits can be obtained than other tree species.