速生阶段西南桦人工林碳贮量及其分布格局  

Carbon storage and distribution of Betula alnoides plantation at fast growing stage

作　　者：黄弼昌 何斌[2] 周燕萍 何纾敏 廖倩苑[2] 李远航[2] 舒凡[2] 

机构地区：[1]广西天峨县林朵林场,广西天峨547300 [2]广西大学,广西南宁530004

出　　处：《中南林业科技大学学报》2016年第2期79-83,共5页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(31160152);广西"十一五"林业科学研究项目(桂林科字[2007]第15号)

摘　　要：西南桦是我国热带、南亚热带地区的速生、珍贵用材树种,具有重要的生态和经济价值,本研究对广西天峨县林朵林场速生阶段(12年生)西南桦人工林的碳素含量、贮量及其空间分布格局进行了研究。结果表明:(1)西南桦不同器官碳素含量为443.5~475.3 g/kg,各器官碳素含量排序从大到小依次为干材、树枝、树根、树叶、干皮。灌木层、草本层和凋落物层碳素含量分别为442.6、427.8和450.3 g/kg。土壤(0~80 cm)中碳素含量为15.04 g/kg,其中表土层(0~20 cm)的碳素含量明显高于其他土层;(2)西南桦人工林碳素总贮存量为202.41 t/hm^2,其中乔木层为57.13 t/hm^2,占28.22%;灌木层为1.04 t/hm^2,占0.51%;草本层为0.80 t/hm^2,占0.40%;凋落物层为1.92 t/hm^2,占0.95%;土壤层为143.44 t/hm^2,占70.87%;(3)12年生西南桦人工林年净生产力为10.20 t/(hm^2·a),碳素年净固定量为4.77 t/(hm^2·a),折合成CO2的量为17.49 t/(hm^2·a)。Betula alnoides is a species with fast growth and high-quality timber, which is distributed in tropical, warm sub-tropical zones in China. It is of great ecological and economic value. The content, storage and distribution of carbon in B. alnoides plantation at fast growing stage（12-year-old） were investigated in Tiane Linduo forestry farm of Guangxi, China. The results showed that carbon content in different organs of B. alnoides trees ranged from 443.5 g/kg to 475.3 g/kg, which was in order as follow： stem branch root leaf bark. The carbon content in shrub, herb, litter floor were 442.6.9 g/kg, 427.8 g/kg and 450.3 g/kg, respectively. Carbon content in the soil（0 - 80）was 15.04 g/kg, and the surface soil（0 - 20 cm） was obviously higher than that of other soil. The total carbon storage in B. alnoides plantation ecosystems amounted to 202.41 t/hm^2, of which overstorey of B. alnoides trees stored 57.13 t/hm^2 and accounted for 28.22%, and under-storey plant stored 1.84 t/hm^2 and accounted for 0.91%,and litter floor 1.92 t/hm^2 and accounted for 0.95%, and soil stored 143.44 t/hm^2 and accounted for 70.87%. The annual net productivity of B. alnoides trees was 10.20 t/（hm^2·a）, and annual net carbon fixation was up to 4.77 t/（hm^2·a）, amounted CO2 to 17.49 t CO2 t/（hm^2·a）.

关 键 词：西南桦人工林 碳素含量 碳贮量 碳分配 

分 类 号：S718.55[农业科学—林学]