Carbon allocation in a Bornean tropical rainforest without dry_ seasons
Carbon allocation in a Bornean tropical rainforest without dry_ seasons
复制标题
无旱季婆罗洲热带雨林的碳分配
DOI：
10.1007/s10265-012-0544-0
复制
发表时间：
2013
影响因子：
2.8
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Katayama;et al.
为了阐明无旱季的婆罗洲热带雨林的碳(C)分配特征，研究了该森林的总初级生产力(GPP)和碳分配，即地上净初级生产力(ANPP)、地上植物呼吸(APR)和地下总碳通量(TBCF)，并与亚马逊热带雨林的旱季热带雨林的碳分配进行了比较。GPP(30.61mgc/ha−1年−1，涡旋协方差测量；34.40mgc/ha−1年期−1，生物测定)与亚马逊热带雨林的结果相当。净现值(6.76MGC ha−1年期−1)与亚马逊热带雨林相当，APR(8.01MGC ha−1年−1)略低于它们各自的值，尽管我们的立地地上生物量更大。总蒸散量(19.63MGC ha−1年期−1)高于亚马逊森林。具有可比性的ANPP和较高的TBCF是意想不到的，因为较高的水分可利用性意味着较少的细根对水分的竞争，从而使GPP获得较高的ANPP和较低的TBCF。较低的养分利用率可能解释了可比的ANPP和较高的TBCF。这些数据表明，成熟热带雨林之间的碳分配模式存在差异，这种差异不能仅仅用土壤水分有效性的差异来解释。
To clarify characteristics of carbon (C) allocation in a Bornean tropical rainforest without dry seasons, gross primary production (GPP) and C allocation, i.e., above-ground net primary production (ANPP), aboveground plant respiration (APR), and total below-ground carbon flux (TBCF) for the forest were examined and compared with those from Amazonian tropical rainforests with dry seasons. GPP (30.61 MgC ha−1year−1, eddy covariance measurements; 34.40 MgC ha−1year−1, biometric measurements) was comparable to those for Amazonian rainforests. ANPP (6.76 MgC ha−1year−1) was comparable to, and APR (8.01 MgC ha−1year−1) was slightly lower than, their respective values for Amazonian rainforests, even though aboveground biomass was greater at our site. TBCF (19.63 MgC ha−1year−1) was higher than those for Amazonian forests. The comparable ANPP and higher TBCF were unexpected, since higher water availability would suggest less fine root competition for water, giving higher ANPP and lower TBCF to GPP. Low nutrient availability may explain the comparable ANPP and higher TBCF. These data show that there are variations in C allocation patterns among mature tropical rainforests, and the variations cannot be explained solely by differences in soil water availability.