Coupled action of rock weathering and aquatic photosynthesis: Influence of the biological carbon pump effect on the sources and deposition of organic matter in Ngoring Lake, Qinghai–Tibet Plateau, China

He, Haibo; Liu, Guangxin; Zou, Yao; Li, Xiangzhong; Ji, Ming; Li, Dongli

doi:10.1016/j.catena.2021.105370

Cited by 9 publications

(1 citation statement)

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“…Since sedimentary organic and inorganic carbon tend to be susceptible to plenty of drivers, such as carbon sources, climate, sedimentary environments, and human activities (i.e. land use and nutrient supply) (Tenzer et al, 1997;Rumolo et al, 2011;Yu et al, 2015;He et al, 2021), estimation of carbon burial in a large lake based merely on several sites is questionable. High-resolution sampling in a large lake is advantageous to eliminate the inaccuracy of several sites and identify the impacts of human activities and natural conditions on carbon as an implication for environmental restoration and construction surrounding the lake.…”

Section: Introductionmentioning

confidence: 99%

Spatial Patterns of Organic and Inorganic Carbon in Lake Qinghai Surficial Sediments and Carbon Burial Estimation

et al. 2021

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Lake carbon burial is of vital significance in global carbon cycle and carbon budget, particularly in the large deepwater lakes. However, carbon burial in large deepwater lakes is hard to estimate due to the difficulty in obtaining high spatial-resolution samples. In this study, we investigated distributions of total organic carbon (TOC) and inorganic carbon (TIC), two main carbon components in lake sediments, based on dozens of surficial sedimentary samples (n = 26) covering whole Lake Qinghai, the largest saline lake in China. The results showed that the TOC content, with a range of 1.4–4.8%, was significantly higher in the lake area near the northern lakeshore where human activities are concentrated and lower in the lake areas near the Buha River mouth and the eastern lake area. In contrast, the TIC content, ranging from 1.5 to 3.8%, increased from the northwestern and southeastern lake areas toward the lake center, and mainly depended on hydro-chemical and hydraulic characteristics. The inorganic carbon burial (47.77 ± 19.73 Gg C yr−1) was approximately equal to organic carbon burial (47.50 ± 22.68 Gg C yr−1) and accounted for about 50% of the total carbon burial (95.27 ± 37.74 Gg C yr−1), suggesting that saline lakes constitute a large inorganic carbon pool in addition to an organic carbon pool. Because of saline water body type in arid and semiarid regions and alpine Qinghai–Tibet Plateau, lakes in these regions have huge inorganic carbon burial potential and important contributions to the global carbon budget.

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Section: Introductionmentioning

confidence: 99%