Carbon cycling and net ecosystem production at an early stage of secondary succession in an abandoned coppice forest
Carbon cycling and net ecosystem production at an early stage of secondary succession in an abandoned coppice forest
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DOI：
10.1007/s10265-009-0274-0
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发表时间：
2010-07
影响因子：
2.8
通讯作者：
T. Ohtsuka;Yoko Shizu;A. Nishiwaki;Y. Yashiro;H. Koizumi
中科院分区：
文献类型：
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作者：
T. Ohtsuka;Yoko Shizu;A. Nishiwaki;Y. Yashiro;H. Koizumi
次生混交林是人类主导的温带地区森林覆盖的主要类型之一。然而，我们对次生演替如何影响这些生态系统中的碳循环和碳固存的了解有限。研究了寒温带落叶林次生演替早期(采伐后18a)4年(2004-2008年)的碳循环和生态系统净生产量(NEP)。18年生林分的净初级生产量为5.2万亿t C/ha−1年−1，包括地下粗根，分为2.5t C−1年−1生物量增量，1.6t C−1年−1叶凋落物，1.0t C−1年−1a其他木质碎屑。土壤表层CO2年释放总量为6.8亿t C/ha−1年−1，其中包括根系呼吸(1.9t C/ha−1年−1)和土壤异养呼吸(RH)(4.9t C/ha−1年−1)。18年生林分的生物量库显著增加，这是由于林木总生长量大，树干死亡率低所致。相反，土壤有机质库显著减少(−1.6tC/ha−1年−1)，但还需要进一步研究地下碎屑的产生和土壤有机质分解的相对湿度。在次生演替的这个阶段，这片18年生的幼林是一个弱碳汇(0.9tC/ha−1年−1)。18年生林的净生产力可能会逐渐增加，这是因为生物量随着树木的生长而增加，随着林分发展而增加凋落物和枯枝落叶产量而改善土壤有机质库。
Secondary mixed forests are one of the dominant forest cover types in human-dominated temperate regions. However, our understanding of how secondary succession affects carbon cycling and carbon sequestration in these ecosystems is limited. We studied carbon cycling and net ecosystem production (NEP) over 4 years (2004–2008) in a cool-temperate deciduous forest at an early stage of secondary succession (18 years after clear-cutting). Net primary production of the 18-year-old forest in this study was 5.2 tC ha−1year−1, including below-ground coarse roots; this was partitioned into 2.5 tC ha−1year−1biomass increment, 1.6 tC ha−1year−1foliage litter, and 1.0 tC ha−1year−1other woody detritus. The total amount of annual soil surface CO2efflux was 6.8 tC ha−1year−1, which included root respiration (1.9 tC ha−1year−1) and heterotrophic respiration (RH) from soils (4.9 tC ha−1year−1). The 18-year forest at this study site exhibited a great increase in biomass pool as a result of considerable total tree growth and low mortality of tree stems. In contrast, the soil organic matter (SOM) pool decreased markedly (−1.6 tC ha−1year−1), although further study of below-ground detritus production and RH of SOM decomposition is needed. This young 18-year forest was a weak carbon sink (0.9 tC ha−1year−1) at this stage of secondary succession. The NEP of this 18-year forest is likely to increase gradually because biomass increases with tree growth and with the improvement of the SOM pool through increasing litter and dead wood production with stand development.