Biomass and carbon storage of Eucalyptus and Acacia plantations in the Pearl River Delta, South China
Biomass and carbon storage of Eucalyptus and Acacia plantations in the Pearl River Delta, South China
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华南珠江三角洲桉树和金合欢人工林的生物量和碳储量
DOI：
10.1016/j.foreco.2012.04.016
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
M. Song
中科院分区：
文献类型：
--
作者：
H. Zhang;D. Guan;M. Song
人工林是重要的碳汇。在中国南方珠江三角洲（PRD），速生桉树和相思树是人工种植园的首选树种，但其生物量生产效率、分配和动态变化以及林下植被、枯落物和粗木质残体（CWD）对生物量和固定碳的贡献却知之甚少。在这里，一组21个不同年龄的人工林进行了监测的生物量积累和分配的模式。利用1989-2003年的森林资源清查数据，采用连续生物量扩展因子（BEF）方法估算了1989-2003年的生物量积累、碳储量及其随时间的变化规律。随着林龄的增加，桉树和相思人工林的生物量积累量分别达到207.45和189.35tha− 1。林下植被、凋落物层和CWD的次生生物量贡献分别占总生物量的10.2%和20.3%，说明次生生物量的贡献非常重要。在相同的生长阶段，桉树人工林对次生生物量的贡献大小为凋落物>草本植物>灌木>CWD，而相思人工林为凋落物>CWD>灌木>草本植物。珠江三角洲的桉树和相思人工林积累了2.66- 7.84 Mt的生物量和1.33- 3.92 Mt的固碳量。两种人工林中，大部分（桉树82.1%，相思89.3%）处于幼龄至中龄阶段。相思树人工林产生了较高的生物量密度比桉树人工林。加强森林管理和重新造林方案，特别是针对金合欢林或桉树/金合欢混交林的方案，为今后的碳固存提供了良好的潜力。
Forest plantations represent an important carbon sink. In the Pearl River Delta (PRD) in Southern China, fast-growing Eucalyptus and Acacia are favoured plantation species, but little is known regarding their efficiency with respect to biomass production, partitioning and dynamics with stand age, or the contribution made by the understory, litter and coarse woody debris (CWD) to the volume of biomass and fixed carbon. Here, a set of 21 plantations of various ages were monitored for the pattern of biomass accumulation and partitioning. A continuous biomass expansion factor (BEF) method was applied to a set of forest inventory data (FID) over the periods 1989–2003 to estimate biomass accumulation, carbon storage and its pattern of change over time. The accumulation of biomass increased with stand age, reaching, respectively, 207.45 and 189.35tha−1in mature Eucalyptus and Acacia plantations. The contribution of secondary biomass from the understory, litter layer and CWD accounted for, respectively, up to 10.2% and 20.3% of the total biomass in the two types of plantation, highlighting the significance of secondary biomass. At a similar growth stage, the ranking of the contribution to secondary biomass in the Eucalyptus plantations was litter>herbaceous plants>shrubs>CWD, while in the Acacia plantations, it was litter>CWD>shrubs>herbaceous plants. The Eucalyptus and Acacia plantations in the PRD accumulated some 2.66–7.84Mt of biomass and sequestered 1.33–3.92Mt of carbon. For both species, the bulk of the plantations (Eucalyptus 82.1%, Acacia 89.3%) were at the young to middle-aged stage. The Acacia plantations generated a higher biomass density than the Eucalyptus plantations. Forest management intensification and reforestation programmes, especially targeting Acacia or mixed Eucalyptus/Acacia forests, offer good potential for future carbon sequestration.
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影响因子：
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通讯作者：
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影响因子：
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