摘要
对广东省西江流域不同林龄桉树人工林生态系统碳贮量开展研究,分析桉树人工林的生长周期及人工经营对生态系统的乔木、林下植物、凋落物和土壤碳贮量及其分配格局的影响,并对桉树碳汇能力及经济价值进行评估。结果表明:(1)1年生桉树林土壤0～25 cm和25～50 cm层有机碳密度分别为68.69 t.hm-2和40.85 t.hm-2,3年生分别为69.84 t.hm-2和40.18 t.hm-2,同一土层不同林龄间土壤有机碳密度差异不显著(p>0.05),在垂直分布上均表现出随土壤深度增加而极显著降低的趋势。(2)1年生桉树生态系统碳储量为107.33 t.hm-2,空间分配序列为土壤层(95.94 t.hm-2,89.39%)>地表凋落物层(4.52 t.hm-2,4.21%)>乔木层(3.84 t.hm-2,3.58%)>林下植被层(3.03 t.hm-2,2.82%);3年生桉树人工林生态系统的碳储量为128.72 t.hm-2,空间分配序列为土壤层(99.28 t.hm-2,77.13%)>乔木层(23.38 t.hm-2,18.16%)>地表凋落物层(3.62 t.hm-2,2.81%)>林下植被层(2.44 t.hm-2,1.90%),二者均是土壤层贡献率最大。(3)1年生桉树人工林生态系统碳汇总价值为45 728.26元/hm2,固定CO2的经济效益可达到167 822.141元/hm2。3年生桉树人工林生态系统碳汇总价值55 601.65元/hm2,固定CO2的经济效益可达到204 058.04元/hm2。
The carbon storage of different age Eucalyptus urophylla plantation were studied in Western Pearl River Basin, and analyzed the relation between forestry management with the its distribution patterns of tree layer, litterfall and the understory, and the economic value of the carbon sequestration were also examined. The results shows that （1） In different soil layer, with the increase of soil depth, soil organic carbon density decreased, but there was significant difference of soil organic carbon density between 1 year stand and 3 year stand though the highest is in older stand, that were 69.84 t·hm^-2 ,40.18 t ·hm^-2 in 0 -25 cm layer 25 -50 cm layer respectively and the lowest is in younger stand, that were 68, 69 t·hm^-2,40.85 t·hm^-2 in 0 -25 cm layer 25 -50 cm layer respectively. （2）The carbon storage different from the stand age, the 1 year stand was 107.33 t ·hm^-2, 3 year stand was 128.72 t ·hm^-2, but the range order was little difference in different layer, soil layer occupied the highest, and soil layer（95.94 t ·hm^-2 ,89.39% ） 〉 litter fall（4.52 t·hm^-2 ,4.21% ） 〉 tree layer（3.84 t ·hm^-2, 3.58% ） 〉 understory（3.03 t ·hm^-2,2.82% ） in 1 year stand, and soil layer（99.28 t ·hm^-2,77.13% ） 〉 tree layer（23.38 t ·hm^-2,18.16% ） 〉 litterfall （ 3. 62 t·hm^-2,2.81% ） 〉 understory（2.44 t ·hm^-2,1.90% ）in 3 year stand. （3）The eeonomie value of carbon sequestration amounts to RMB 45 728.26 yuan, and the eeonomie benefit of fixation earbon dioxide is RMB 167 822. 141 yuan ·hm^-2 in the 1 year stand, and the 3 year stand was RMB 55 601.65yuan, RMB 204 058.04 yuan ·hm^-2.
出处
《广东林业科技》
2009年第6期8-13,共6页
Forestry Science and Technology of Guangdong Province
基金
广东省林业局项目"广东省森林生态效益监测站建设与研究"
关键词
西江流域
桉树人工林
碳储量
碳汇
经济价值
Western Pearl River Basin, Eucalyptus urophylla plantation, carbon storage, carbon sequestration, economic value
