Characteristics of wood CO2 efflux in a Bornean tropical rainforest
Characteristics of wood CO2 efflux in a Bornean tropical rainforest
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DOI：
10.1016/j.agrformet.2016.01.140
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发表时间：
2016-04-15
影响因子：
6.2
通讯作者：
Otsuki, Kyoichi
中科院分区：
文献类型：
--
作者：
Katayama, Ayumi;Kume, Tomonori;Otsuki, Kyoichi
木材CO2排放（R-wood）是森林生态系统中一个重要的碳循环过程，但与新热带地区相比，婆罗洲热带雨林中的R-wood研究较少，而新热带地区具有不同的生物和非生物特征。婆罗洲热带雨林有特别高的地上生物量，因为高挺树的高密度，没有定期的季节性干旱期。这些属性可能反映了特定的R-木材的变化和更高的年度R-木材在婆罗洲的生态系统规模（年度R-木材）。因此，在这项研究中，我们调查的因素，影响个体间的变化，基于室的R-木材在树干表面在胸高（室R-木材）和估计R-木材在生态系统尺度（生态系统-在树干表面在胸高（室R-木材）和估计R-木材在生态系统尺度（生态系统-R-木材）在婆罗洲热带雨林。随后，我们研究了生态系统的时间变化与环境因素，估计了一年的R-木材，然后评估了大型树木对生态系统的R-木材的影响。在2012年和2014年之间的所有五个测量期间，茎生长速率是室R木材中个体间变化的最显著预测因子。因此，干生长率允许准确估计生态系统R-木材，虽然室R-木材不同的直径在胸高（DBH）和树种在一些测量活动。生态系统-R-木材减少与土壤水分。考虑到个体间和时间变化，年R-木材估计为7.06 +/- 2.09 MgC ha（-1）year（-1）。这一数值与新热带区森林中确定的数值相当，尽管本研究地点的地上生物量约为新热带区的两倍。胸径>70 cm的大树占地上生物量的38%，但由于其木质组织表面积所占比例较小，仅占生态系统-R-木材的23%。这些数据表明，林分密度的大型树木可以显着影响地上生物量，但施加不同的森林生态系统R-木材的变化影响不大。(C)2016爱思唯尔B. V.保留所有权利。
Wood CO2 efflux (R-wood) is an important carbon cycling process in forest ecosystems and is less understood in Bornean tropical rainforests compared with that in Neotropics, which have differing biotic and abiotic characteristics. Bornean tropical rainforests have particularly higher aboveground biomass because of high stand densities of tall emergent trees, and no regular seasonal dry period. These properties may reflect specific R-wood variation and higher annual R-wood at the ecosystem scale (annual-R-wood) in Borneo. Hence, in this study, we investigated factors that affect inter-individual variation in chamber-based R-wood on stem surfaces at breast height (chamber-R-wood) and estimated R-wood at the ecosystem scale (ecosystem-on stem surfaces at breast height (chamber-R-wood) and estimated R-wood at the ecosystem scale (ecosystem-R-wood) in a Bornean tropical rainforest. Subsequently, we examined temporal variation in ecosystem with environmental factors, estimated annual-R-wood, and then evaluated the effects of large trees on ecosystem-R-wood. ecosystem-R-wood.Stem growth rates were the most significant predictor of inter-individual variation in chamber-R-wood during all five measurement periods between 2012 and 2014. Accordingly, stem growth rates allowed accurate estimates of ecosystem-R-wood, although chamber-R-wood varied with diameter at breast height (DBH) and tree species in some measurement campaigns. Ecosystem-R-wood decreased with soil moisture. Considering the inter-individual and temporal variation, annual-R-wood was estimated at 7.06 +/- 2.09 MgC ha(-1) year(-1). This value was comparable to those determined in Neotropical forests, even though aboveground biomass in the present study site was approximately twice of those in Neotropical sites. Large trees with DBH >70 cm comprised 38% of aboveground biomass but accounted for only 23% of ecosystem-R-wood because of the small portion of woody tissue surface area of the large trees. These data indicate that the stand density of large trees can considerably affect aboveground biomass but exert less influence on variation in ecosystem-R-wood among various forests. (C) 2016 Elsevier B.V. All rights reserved.