CAJ | 학술논문

云杉属（Picea）和圆柏属（Sabina）乔木是青海省分布最广、蓄积量最大的乔木，弄清这2个属内各乔木树种含碳率的变化及其影响因素，对于青海省碳储量评估具有至关重要作用。考虑最小样本需求、样本的区域代表性和工作量等方面的因素，在青海省乔木林中云杉属和圆柏属乔木分布区内选取天然起源的云杉属乔木（包括：青海云杉Picea crassifolia、川西云杉P. likiangensis var. rubescens和紫果云杉P. purpurea）29棵和圆柏属乔木30棵(包括：祁连圆柏Sabina przewalskii和大果圆柏S. tibetica)作为青海省云杉属和圆柏属含碳率分析样本，采用干烧法对其树干、树皮、枝条、死枝、叶和根的含碳率进行测定。结果显示：（1）青海省云杉属和圆柏属5个乔木树种全株的含碳率在0.4545（紫果云杉）至0.4650（祁连圆柏）之间，其中云杉属的平均含碳率为0.4606，圆柏属的为0.4661，云杉属的含碳率显著低于圆柏属。（2）青海省云杉属和圆柏属5个乔木树种各器官含碳率在0.4434（祁连圆柏的枝条）至0.4964（大果圆柏的叶）之间；总体上叶的含碳率高于其它器官；同一树种不同器官以及不同树种同一器官的含碳率之间均存在差异，但是变化较小（变异系数均在4%以内）。（3）树种含碳率是树种本身属性（内因）和环境因素（外因）共同作用的结果，在不同的生长环境下，同一树种的含碳率可能有较大差异；而生长在近似环境中的不同树种其含碳率可能很接近。由于含碳率的变化会对碳储量评估产生显著影响，因此区域碳储量的准确评估需要以该区域优势树种含碳率的精确测定为基础。
운삼속（Picea）화원백속（Sabina）교목시청해성분포최엄、축적량최대적교목，롱청저2개속내각교목수충함탄솔적변화급기영향인소，대우청해성탄저량평고구유지관중요작용。고필최소양본수구、양본적구역대표성화공작량등방면적인소，재청해성교목림중운삼속화원백속교목분포구내선취천연기원적운삼속교목（포괄：청해운삼Picea crassifolia、천서운삼P. likiangensis var. rubescens화자과운삼P. purpurea）29과화원백속교목30과(포괄：기련원백Sabina przewalskii화대과원백S. tibetica)작위청해성운삼속화원백속함탄솔분석양본，채용간소법대기수간、수피、지조、사지、협화근적함탄솔진행측정。결과현시：（1）청해성운삼속화원백속5개교목수충전주적함탄솔재0.4545（자과운삼）지0.4650（기련원백）지간，기중운삼속적평균함탄솔위0.4606，원백속적위0.4661，운삼속적함탄솔현저저우원백속。（2）청해성운삼속화원백속5개교목수충각기관함탄솔재0.4434（기련원백적지조）지0.4964（대과원백적협）지간；총체상협적함탄솔고우기타기관；동일수충불동기관이급불동수충동일기관적함탄솔지간균존재차이，단시변화교소（변이계수균재4%이내）。（3）수충함탄솔시수충본신속성（내인）화배경인소（외인）공동작용적결과，재불동적생장배경하，동일수충적함탄솔가능유교대차이；이생장재근사배경중적불동수충기함탄솔가능흔접근。유우함탄솔적변화회대탄저량평고산생현저영향，인차구역탄저량적준학평고수요이해구역우세수충함탄솔적정학측정위기출。
Picea and Sabina trees are the most widely distributed trees with the largest volume in Qinghai province. Understanding the changes and impact factor of carbon content rate of tree species in these 2 genera are important for carbon storage estimation in Qinghai province. Considering the minimum sample requirements, typical of sampling in the study area and workload, 29 Picea trees (Picea crassifolia, P. likiangensis var. rubescens and P. purpurea) and 30 Sabina trees(Sabina przewalskii and S. tibetica) were selected in natural forest of Picea and Sabina trees distribution area in Qinghai province. Carbon content rate of trunks, barks, branches, dead branches, leaves and roots in these samples was measured with dry combustion method. The results showed as below. (1) Carbon content rate of 5 tree species in Picea and Sabina was from 0.454 5 (P. purpurea) to 0.465 0 (S. przewalskii). Carbon content rate of Picea and Sabina were 0.460 6 and 0.466 1, respectively; the former was higher than the latter significantly. (2) Carbon content rate of organs in 5 tree species of Picea and Sabina was from 0.443 4(branches of S. przewalskii) to 0.4964 (leaves of S. tibetica). Carbon content rate of leaves was much higher than other organs in general. The carbon content rate varied in different organs of the same species and the same organs in different species, but these differences were small and did not exceed 4%. (3) Carbon content rate of tree species is the collective effort of both the characteristic of tree species (inner factor) and environmental conditions (outer factor). In different growing conditions, the same species may have a larger difference in carbon content rate, while different tree species growing in the similar environment may have similar carbon content rate. Changes in carbon content rate will have a significant impact on carbon storage evaluation. Thus, accurate measurements of the carbon content rate of main tree species in an area are the basis of regional carbon assessment.