Geographical statistical assessments of carbon fluxes in terrestrial ecosystems of China: Results from upscaling network observations
Geographical statistical assessments of carbon fluxes in terrestrial ecosystems of China: Results from upscaling network observations
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DOI：
10.1016/j.gloplacha.2014.04.003
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发表时间：
2014-07
影响因子：
3.9
通讯作者：
Xianjin Zhu;Guirui Yu;Honglin He;Qiufeng Wang;Zhi Chen;Yanni Gao;Yiping Zhang;Jun-hui Zhang
中科院分区：
文献类型：
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作者：
Xianjin Zhu;Guirui Yu;Honglin He;Qiufeng Wang;Zhi Chen;Yanni Gao;Yiping Zhang;Jun-hui Zhang
准确量化碳收支的大小和分布有助于制定减缓全球气候变化的战略。基于生态系统总生产力（GEP）、生态系统呼吸（ER）和生态系统净生产力（NEP）的空间格局及其驱动因子，构建了中国碳通量的地理统计评估方案，并对中国碳通量的大小进行了量化。利用涡度相关资料对最优方案进行验证，分析碳通量的空间分布。利用基于气候的地理统计评估方案，我们估计2000年代中国的GEP、ER和NEP分别为7.51 ± 0.51、5.82 ± 0.16和1.91 ± 0.15 PgC yr− 1，分别占全球年碳通量的4.29%-6.80%、5.65%-6.06%和9.10%-12.73%。最优方案产生的GEP、ER和NEP的空间分布相似，均呈东南-西北递减梯度。GEP、ER和NEP的最大值分别为1790、1300和490 gC m− 2 yr − 1，出现在中亚热带和南亚热带。基于气候的地理统计评估方案为区域碳收支评估提供了一个独立的数据集，可以将其视为潜在的碳通量。同时，中国大部分地区都是潜在的碳汇，尤其是东部地区，最大的潜在碳汇出现在中亚热带和南亚热带。
Accurate quantifying the magnitudes and distributions of carbon budgets is helpful for strategies in mitigating global climate change. Based on spatial patterns of carbon fluxes (gross ecosystem productivity (GEP), ecosystem respiration (ER) and net ecosystem productivity (NEP)) and their drivers, we constructed geographical statistical assessment schemes and quantified the magnitudes of carbon fluxes in China. The optimal assessment scheme was then validated with observed eddy covariance data to analyze the spatial distributions of carbon fluxes. Using climate-based geographical statistical assessment schemes, our estimates of GEP, ER and NEP in China during 2000s were 7.51 ± 0.51, 5.82 ± 0.16 and 1.91 ± 0.15 PgC yr− 1, corresponding to 4.29%–6.80%, 5.65%–6.06% and 9.10%–12.73% of global annual carbon fluxes, respectively. The spatial distributions of GEP, ER and NEP, generated from the optimal scheme, were similar, following a southeast–northwest decreasing gradient. The maximum values for GEP, ER and NEP were 1790, 1300 and 490 gC m− 2yr− 1, respectively, which occurred in Central subtropics and Southern subtropics. Climate-based geographical statistical assessment schemes provided an independent dataset for the regional carbon budget assessment, which can be deemed as the potential carbon fluxes. Meanwhile, most areas in China were potential carbon sink especially Eastern China and the largest potential carbon sink appeared in Central subtropics and Southern subtropics.