Net Ecosystem Production of Two Contrasting Boreal Black Spruce Forest Communities
Net Ecosystem Production of Two Contrasting Boreal Black Spruce Forest Communities
复制标题
两个对比鲜明的北方黑云杉森林群落的净生态系统生产
DOI：
10.1007/pl00021511
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发表时间：
2003
期刊：
影响因子：
3.7
通讯作者：
J. Norman
中科院分区：
文献类型：
--
作者：
Kari O’Connell;S. Gower;J. Norman
本研究的目的是比较两种树龄相似的北方黑云杉 (Picea mariana [Mill.] BSP) 森林群落的碳 (C) 预算：中等排水土壤上带羽毛苔地被植物的封闭冠层黑云杉 (BSFM) 和排水不良土壤上带水苔地被植物 (BSSP) 的开放冠层黑云杉。测量或估算了碳含量、土壤表面二氧化碳 (CO2) 通量、异养呼吸、净初级生产 (NPP) 和净生态系统生产 (NEP)。两个群落的总碳含量$({\rm BSFM},\ 113\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1};{\rm BSSP},\ 107\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1})$没有显着差异(P = 0.95)。然而，BSFM 社区的年度显着高于 BSSP 社区（P < 0.0001）。 BSFM 大于 BSSP 群落且 BSSP 的泥炭碳含量高于 BSFM 群落，证明 BSSP 群落的分解率低于 BSFM 群落。 BSFM 群落的 NEP 显着（P = 0.04）比 BSSP 群落更负面，但这两个群落都是大气碳源。这项研究的结果说明了土壤条件的微小差异对生态系统碳积累的影响。
The objective of this study was to compare the carbon (C) budgets of two similar-aged boreal black spruce (Picea mariana [Mill.] BSP) forest communities: closed-canopy black spruce with feathermoss ground cover (BSFM) on moderately drained soils and open-canopy black spruce with Sphagnum ground cover (BSSP) on poorly drained soils. C content, soil surface carbon dioxide ( CO2) flux, heterotrophic respiration, net primary production (NPP), and net ecosystem production (NEP) were measured or estimated. The total C content for the two communities $({\rm BSFM},\ 113\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1};{\rm BSSP},\ 107\ {\rm Mg}\ {\rm C}\ {\rm ha}^{-1})$ did not differ significantly (P = 0.95). However, annualwas significantly greater (P < 0.0001) for the BSFMthan the BSSPcommunity. The greaterin the BSFMthan the BSSP communityand the higher peat C content for the BSSPthan the BSFMcommunity provided evidence that the BSSP community had a lower decomposition rate than the BSFM community. NEP was significantly (P = 0.04) more negative for the BSFM communitythan the BSSP community, but both communities were C sources to the atmosphere. The results from this study illustrate the influence of small differences in edaphic conditions on ecosystem C accumulation.