Assessment of frozen ground organic carbon pool on the Qinghai-Tibet Plateau

Springer Science and Business Media LLC - Tập 19 - Trang 128-139 - 2018
Lin Jiang1,2,3,4, Huai Chen1,3,4, Qiuan Zhu1,2, Yanzheng Yang1,2, Mingxu Li1,2, Changhui Peng1,2,5, Dan Zhu3,4, Yixin He3,4
1College of Forestry, Northwest A&F University, Yangling, China
2State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, China
3Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China
4Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, China
5Department of Biology Science, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, Canada

Tóm tắt

Under rapid climate change, soil organic carbon (SOC) dynamic in frozen ground may significantly influence terrestrial carbon cycles. The aim of this study was to investigate the storage, spatial patterns, and influencing factors of SOC in frozen ground on the Qinghai-Tibet Plateau, which known as the earth’s Third Pole. Using the observed edaphic data from China’s Second National Soil Survey, we estimated the SOC storage (SOCS) of frozen ground (including permafrost, seasonally, and short time frozen ground) on the plateau with a depth of 0–3 m. Furthermore, the effect of vegetation and climate factors on spatial variance of SOC density (SOCD) was analyzed. The SOCD decreased from the southeastern to the northwestern part of the plateau, and increased with shorten of freezing duration. SOCS of permafrost, seasonally, and short time frozen ground were calculated as 40.9 (34.2–47.6), 26.7 (24.1–29.4), and 6 (5.6–6.4) Pg, making a total of 73.6 (63.9–83.3) Pg in 0–3 m depth on the plateau. Normalized difference vegetation index and mean annual precipitation could significantly affect the spatial distribution of SOC in permafrost and seasonally frozen ground. The soil in plateau frozen ground contained substantial organic carbon, which could be affected by plant and climate variables. However, the heterogeneous landform may make the fate of carbon more complicated in the future.

Tài liệu tham khảo

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