The carbon stock of alpine peatlands on the Qinghai-Tibetan Plateau during the Holocene and their future fate
The carbon stock of alpine peatlands on the Qinghai-Tibetan Plateau during the Holocene and their future fate
复制标题
青藏高原全新世高山泥炭地碳储量及其未来命运
DOI：
10.1016/j.quascirev.2014.05.003
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发表时间：
2014-07-01
影响因子：
4
通讯作者：
Wu, Jianghua
中科院分区：
文献类型：
--
作者：
Chen, Huai;Yang, Gang;Wu, Jianghua
泥炭地碳动态研究主要集中在北方、亚北极和热带泥炭地。然而，像青藏高原若尔盖泥炭地这样对气候变化和人为干扰敏感的高寒泥炭地，其碳动态的研究数据有限。我们研究了这些泥炭沉积物的作用若尔盖作为C储备和汇通过测量泥炭深度，放射性碳年龄和泥炭和C积累率在7个站点。泥炭深度为0.20 ~ 6.0 m，基龄为1635 ~ 14095 cal/yr BP，泥炭积累速率为0.12 ~ 0.85 mm/yr，碳积累速率为5 ~ 48 g/m ~（-2）/yr。根据野外调查和遥感资料，认为若尔盖泥炭地完整面积为3179 km 2，退化面积为1426 km 2，总面积为4605 km 2。若尔盖泥炭地目前的泥炭C储量为0.477 Pg（范围为0.206至0.672 Pg）。我们还估算了青藏高原泥炭地覆盖面积约为5091 krn（2），螯合了0.543 Pg C，其中88%在若尔盖，其余在高原其他地区。人类活动，加上高原上普遍存在的变暖（过去50年中温度每十年上升0.2摄氏度），不仅使完整的泥炭地面积缩小，而且还导致泥炭地大量释放碳。(C)2014爱思唯尔有限公司版权所有。
Most studies about carbon dynamics of peatlands have been focused on boreal, subarctic and tropical peatlands. However, there is limited data about carbon dynamics of alpine peatlands, like Zoige peatlands on the Qinghai-Tibetan Plateau (QTP), which are sensitive to climate change and human disturbance. We studied the role of these peat deposits on the Zoige as a C reserve and sink by measuring peat depth, radiocarbon age and peat and C accumulation rates at 7 sites. The peat depths of the sample sites ranged from 0.20 to 6.0 m; the basal age on the plateau varied from 1635 to 14095 cal yr BP; the peat accumulation rates ranged from 0.12 to 0.85 mm yr(-1), and the C accumulation rates from 5 to 48 g m(-2) yr(-1). Based on data of field studies and remote sensing, we regarded that with 3179 km(2) of intact peatlands, about 1426 km(2) of degraded peatlands, and the total area of Zoige peatlands was 4605 km(2). The current peat C stock of Zoige peatlands was0.477 Pg (ranging from 0.206 to 0.672 Pg). We also estimated that peatlands covered an area of about 5091 krn(2)on the QTP and sequestered 0.543 Pg C, 88% in Zoige and the rest in other parts of the plateau. Human activities, together with the ubiquitous warming on the plateau (temperature increased by 0.2 degrees C per decade over the past 50 years) not only shrank the area of intact peatlands, but also caused substantial carbon releasing from peatlands. (C) 2014 Elsevier Ltd. All rights reserved.