Quantitative assessment of carbon sequestration reduction induced by disturbances in temperate Eurasian steppe
Quantitative assessment of carbon sequestration reduction induced by disturbances in temperate Eurasian steppe
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欧亚温带草原干扰引起的碳汇减少的定量评估
DOI：
10.1088/1748-9326/aa849b
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发表时间：
2017-10
影响因子：
6.7
通讯作者：
Li JL
中科院分区：
文献类型：
--
作者：
Chen Yizhao;Xu Xia;Ruan Honghua;Chen Yizhao;Li Jianlong;Chen Yizhao;Chen Yizhao;Ju Weimin;Groisman Pavel;Propastin Pavel;Propastin Pavel;Zhou Wei;Li JL
温带欧亚草原(TES)是各种环境、社会和经济压力汇聚的地区。多种类型的干扰广泛存在于该地区，并严重影响着该地区的碳循环。然而，目前对干扰对碳封存的影响的量化评估在很大程度上是缺乏的。在这项研究中，我们结合北方生态系统生产力模拟器(BEPS)、Shiyomi放牧模型和全球火灾模型(GLOB-FIRM)来研究TES中的两种主要干扰(即家庭放牧和火灾)对区域碳固存的影响。利用卫星数据和野外观测对模型性能进行了验证。模型输出表明，干扰对区域范围内的碳固存有重大影响。年总碳损失量为7.8tgC yr−1，占总净生态系统生产力的14.2%。家庭放牧在陆地碳消耗中占主导地位，占两次干扰损失的95%。从1999年到2008年，这两种干扰造成的碳损失显著增加(放牧的R2 = 为0.82P<；0.001，火灾的R2 = 为0.51P <； 为0.05)。在相对贫瘠的草原上大量放牧大大减少了碳封存，特别是在土库曼斯坦、乌兹别克斯坦和内蒙古西南部的草原上。这种空间上明确的信息对广大草原生态系统的碳固存的可持续管理具有潜在的影响。
The temperate Eurasian steppe (TES) is a region where various environmental, social, and economic stresses converge. Multiple types of disturbance exist widely across the landscape, and heavily influence carbon cycling in this region. However, a current quantitative assessment of the impact of disturbances on carbon sequestration is largely lacking. In this study, we combined the boreal ecosystem productivity simulator (BEPS), the Shiyomi grazing model, and the global fire model (Glob-FIRM) to investigate the impact of the two major types of disturbance in the TES (i.e. domestic grazing and fire) on regional carbon sequestration. Model performance was validated using satellite data and field observations. Model outputs indicate that disturbance has a significant impact on carbon sequestration at a regional scale. The annual total carbon lost due to disturbances was 7.8 TgC yr−1, accounting for 14.2% of the total net ecosystem productivity (NEP). Domestic grazing plays the dominant role in terrestrial carbon consumption, accounting for 95% of the total carbon lost from the two disturbances. Carbon losses from both disturbances significantly increased from 1999 to 2008 (R2 = 0.82, P < 0.001 for grazing, R2 = 0.51, P < 0.05 for fire). Heavy domestic grazing in relatively barren grasslands substantially reduced carbon sequestration, particularly in the grasslands of Turkmenistan, Uzbekistan, and the far southwest of Inner Mongolia. This spatially-explicit information has potential implications for sustainable management of carbon sequestration in the vast grassland ecosystems.
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影响因子：
0.8
作者：
Fangmin Zhang;W. Ju;S. Shen;Shaoqiang Wang;Guirui Yu;Shijie Han
通讯作者：
Fangmin Zhang;W. Ju;S. Shen;Shaoqiang Wang;Guirui Yu;Shijie Han
影响因子：
2.7
作者：
K. Tachiiri;M. Shinoda;B. Klinkenberg;Y. Morinaga
通讯作者：
K. Tachiiri;M. Shinoda;B. Klinkenberg;Y. Morinaga
影响因子：
3.1
作者：
D. Viegas;M. Viegas;Ademir de Oliveira Ferreira
通讯作者：
D. Viegas;M. Viegas;Ademir de Oliveira Ferreira
影响因子：
6.6
作者：
Henderson, Benjamin B.;Gerber, Pierre J.;Conant, Richard T.
通讯作者：
Conant, Richard T.
影响因子：
10.1
作者：
Chen, Jiquan;John, Ranjeet;Qi, Jiaguo
通讯作者：
Qi, Jiaguo