Substantial inorganic carbon sink in closed drainage basins globally

Li, Yu; Zhang, Chengqi; Wang, Nai’ang; Qin, Haixu; Zhang, Xinzhong; Liu, Yuan; Xu, Lingmei; Ye, Wangting

doi:10.1038/ngeo2972

Cited by 48 publications

(45 citation statements)

References 43 publications

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“…The sediment accumulation rate was multiplied by dry bulk density (DBD) to generate the mass accumulation rate (MAR); MAR was then multiplied by the sediment OC content to obtain C accumulation rate (CAR). The sediment inorganic C fraction was not counted in this study due to the limited data available although lakes in the dry regions may have high inorganic C content (Li et al ). For most sites, the OC content was determined by combustion using an Elemental Analyzer with reference to standard samples and for those lacking OC values (Chaiwopu, Sugan Lake, Gahai Lake, and Wudalianchi), it was estimated by converting loss‐on‐ignition, which was determined using standard methods and converted by a correction factor (0.469) (Dean ).…”

Section: Data Sources and Analysis Methodsmentioning

confidence: 99%

Temporal‐spatial pattern of organic carbon sequestration by Chinese lakes since 1850

Wang

Chen

et al. 2017

Limnology & Oceanography

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In the last century, lakes in China have been subject to forcing by climate change, intensification of agriculture, and urban expansion, though their effects on lake OC sequestration are poorly understood. We compiled dry mass and OC burial rates from 82 210Pb‐dated lake sediment records in China. The average post‐1950 focusing‐corrected lake mass accumulation rate (MARFC) of 256 ± 56 g m−2 yr−1 (median ± SE) and focusing‐corrected OC accumulation rate (CARFC) of 8 ± 3 g C m−2 yr−1 were significantly higher than the 1850–1900 rates (p < 0.05). However, the magnitude of increase in CARFC was most marked in the subtropical lakes of the East Plain (EP) and on the Yunnan‐Guizhou Plateau (YG), where the post‐1950 CARFC was about three times that of the 1850–1900 (p < 0.05), due to the agricultural intensification and urban expansion in recent decades. Moreover, MARFC was significantly higher in the EP than that on the Mongolia‐Xinjiang Plateau (MX) for all time periods (p < 0.05). Lake CARFC in YG was significantly higher than rates in the Qinghai‐Tibetan Plateau (QTP) for the post‐1950 and MX for the 1850–1900 (p < 0.05). Regression analyses showed that the controls on lake CARFC varied among regions, with catchment climate variables the most important regulators in MX, Northeast China, and QTP, but the in‐lake nutrient concentrations were more important in YG and EP (p < 0.05). The results from this study show how modern limnic OC sequestration has changed with human disturbance and climate change in China.

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Section: Data Sources and Analysis Methodsmentioning

confidence: 99%

Temporal‐spatial pattern of organic carbon sequestration by Chinese lakes since 1850

Wang

Chen

et al. 2017

Limnology & Oceanography

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“…This large “missing” or “residual” terrestrial carbon sink may be due to the lateral flows of sequestered C to aquatic ecosystems, which is rarely considered in most of the current TBMs. Recent evidence has suggested that this non‐biological process sustains an important C sinks in this region (Li et al, ). Therefore, we recommend the inclusion of dissolved C coupled with hydrologic processes in the modeled soil C cycling.…”

Section: Discussionmentioning

confidence: 99%

Vegetation Functional Properties Determine Uncertainty of Simulated Ecosystem Productivity: A Traceability Analysis in the East Asian Monsoon Region

Cui

Huang

Arain

et al. 2019

Global Biogeochemical Cycles

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Global and regional projections of climate change by Earth system models are limited by their uncertain estimates of terrestrial ecosystem productivity. At the middle to low latitudes, the East Asian monsoon region has higher productivity than forests in Europe‐Africa and North America, but its estimate by current generation of terrestrial biosphere models (TBMs) has seldom been systematically evaluated. Here, we developed a traceability framework to evaluate the simulated gross primary productivity (GPP) by 15 TBMs in the East Asian monsoon region. The framework links GPP to net primary productivity, biomass, leaf area and back to GPP via incorporating multiple vegetation functional properties of carbon‐use efficiency (CUE), vegetation C turnover time (τveg), leaf C fraction (Fleaf), specific leaf area (SLA), and leaf area index (LAI)‐level photosynthesis (PLAI), respectively. We then applied a relative importance algorithm to attribute intermodel variation at each node. The results showed that large intermodel variation in GPP over 1901–2010 were mainly propagated from their different representation of vegetation functional properties. For example, SLA explained 77% of the intermodel difference in leaf area, which contributed 90% to the simulated GPP differences. In addition, the models simulated higher CUE (18.1 ± 21.3%), τveg (18.2 ± 26.9%), and SLA (27.4±36.5%) than observations, leading to the overestimation of simulated GPP across the East Asian monsoon region. These results suggest the large uncertainty of current TBMs in simulating GPP is largely propagated from their poor representation of the vegetation functional properties and call for a better understanding of the covariations between plant functional properties in terrestrial ecosystems.

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“…While this is the prevalent lake type globally, closed basins can play an important role in arid and semi-arid regions (Einsele et al 2001 ; Li et al 2017 ). The function of these lakes in the global carbon cycle is presently unknown; however, a recent study estimated that in global closed drainage basins, about 0.15 Pg C yr −1 of the incoming DIC is stored (Li et al 2017 ). Our estimates are also limited by the lack of data for global GPP lotic and CCP lotic .…”

Section: Refining Terrestrial Dic Export Estimatesmentioning

confidence: 99%

A lake classification concept for a more accurate global estimate of the dissolved inorganic carbon export from terrestrial ecosystems to inland waters

Engel

Farrell

McCullough

et al. 2018

Sci Nat

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The magnitude of lateral dissolved inorganic carbon (DIC) export from terrestrial ecosystems to inland waters strongly influences the estimate of the global terrestrial carbon dioxide (CO2) sink. At present, no reliable number of this export is available, and the few studies estimating the lateral DIC export assume that all lakes on Earth function similarly. However, lakes can function along a continuum from passive carbon transporters (passive open channels) to highly active carbon transformers with efficient in-lake CO2 production and loss. We developed and applied a conceptual model to demonstrate how the assumed function of lakes in carbon cycling can affect calculations of the global lateral DIC export from terrestrial ecosystems to inland waters. Using global data on in-lake CO2 production by mineralization as well as CO2 loss by emission, primary production, and carbonate precipitation in lakes, we estimated that the global lateral DIC export can lie within the range of to Pg C yr−1 depending on the assumed function of lakes. Thus, the considered lake function has a large effect on the calculated lateral DIC export from terrestrial ecosystems to inland waters. We conclude that more robust estimates of CO2 sinks and sources will require the classification of lakes into their predominant function. This functional lake classification concept becomes particularly important for the estimation of future CO2 sinks and sources, since in-lake carbon transformation is predicted to be altered with climate change.

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Substantial inorganic carbon sink in closed drainage basins globally

Cited by 48 publications

References 43 publications

Temporal‐spatial pattern of organic carbon sequestration by Chinese lakes since 1850

Temporal‐spatial pattern of organic carbon sequestration by Chinese lakes since 1850

Vegetation Functional Properties Determine Uncertainty of Simulated Ecosystem Productivity: A Traceability Analysis in the East Asian Monsoon Region

A lake classification concept for a more accurate global estimate of the dissolved inorganic carbon export from terrestrial ecosystems to inland waters

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