桂东南低山区柳杉人工林生态系统碳储量分配特征  

Study on Carbon Storage and Allocation of Cryptomeria fortunei Plantation in the Low Mountain of Southeast Guangxi

作　　者：蒋林[1,2] 林宁 莫德祥[2] 卓宇 

机构地区：[1]广西六万林场,广西玉林537800 [2]广西大学林学院,广西南宁530005

出　　处：《安徽农业科学》2012年第18期9728-9730,9861,共4页Journal of Anhui Agricultural Sciences

基　　金：广西"十一五"林业科技研究项目(桂林科字[2009]第23号);中国科学院战略性先导科技专项(XDA05050205)

摘　　要：[目的]对南亚热带低山区柳杉人工林碳汇进行研究。[方法]研究广西国营六万林场低山区的31年生柳杉人工林生态系统碳素含量、碳储量及其空间分配特征。[结果](1)柳杉人工林不同器官平均碳素含量变化在498.5～530.3 g/kg,其含量排列为:叶子>枯枝>树干>根蔸>枝条>细根>干皮>中根>粗根;碳素含量随土壤深度的增加而逐渐减少。(2)低山区柳杉人工林的生态系统碳储量为393.651 t/hm2,其中植被层碳储量占生态系统碳储量的29.22%,而0～100 cm土壤层占70.78%。31年生柳杉人工林年净固碳量估算为3.709 t/(hm2.a),其中乔木层的年净固碳量为3.537 t/(hm2.a)。(3)0～20 cm土壤表层碳储量为132.418 t/hm2,比植被层的碳储量还高。[结论]加强低山区的植被保护,减少表层土壤的水土流失,可有效保持南亚热带低山区土壤对碳的长期吸存和维持。[ Objective ] The forest carbon sink of Cryptomeriafortunei Plantation in the low mountain of subtropical region was studied. [ Method] The carbon content , storage and accumulation panern of 31-year-old C. fortunei plamation were revealed in Liuwan Forestry Farm of Guangxi Province. [ Result] （ 1 ） The carbon content in different organs in tree layer ranged from 498.5 - 530.3 g/kg , and decreased in the or- der as leaf 〉 dead wood branch 〉 stem 〉 major root 〉 branch 〉 fine root 〉 bark 〉 medium root 〉 coarse root. The carbon density de- creased drastically with the increase of soil deepness. （ 2 ） The total carbon storages of C. fortunei plantation ecosystem was estimated as 393.651 t/hm^2 , of the total storage of carbon was 29.22% accounted in vegetation layer, and accounted for 70.78% in soil layer. The annu- al carbon net fixation of plantation was estimated up to 3. 709 t/（ hm^2· a） , and annual carbon net fixation in the tree layer was 3. 537 t/（ hm^2 ·a）. （3）The carbon storage in the 0 - 20 cm top soil layer was 132. 418 t/hm^2 , being especially higher than that of vegetation layer. [Condusion ] The conservation of vegetation and topsoil in the low mountain of southern subtropical region could be helpful to the longtime soilcarbon stability.

关 键 词：柳杉人工林 碳素含量 碳储量 南亚热带 

分 类 号：S714[农业科学—林学]