Redistribution of Soil Organic Carbon Induced by Soil Erosion in the Nine River Basins of China

Wang, Xiaoyuan; Quine, Timothy A.; Zhang, Haicheng; Tian, Guangjin; Yuan, Wenping

doi:10.1029/2018jg004781

Cited by 21 publications

(10 citation statements)

References 75 publications

(113 reference statements)

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“…The moderate values of soil loss and gain in uncultivated points (both did not exceed 1.6 mm yr -1 , even in steep areas) confirm the protective effect of the vegetation cover. Similar findings have been reported by Wang et al (2010Wang et al ( , 2019; Navas et al (2014); Gaspar et al (2019). However, the opposite occurs in cultivated steep sites where soil loss doubled the values of uncultivated sites because runoff is not constrained by the vegetation cover.…”

Section: Land Use and Vegetation Cover Effectssupporting

confidence: 86%

Lateral mobilization of soil carbon induced by runoff along karstic slopes

Gaspar

Mabit

Lizaga

et al. 2020

Journal of Environmental Management

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Highlights• 137 Cs inventories document gain or loss of soil by water erosion on karstic slopes • Perceptual approach illustrates SOC and SIC lateral movement along five transects • Topography and landscape linear elements affect runoff and sediment pathways • Erosion-induced SOC loss depends on erosion rates and topsoil SOC content • SIC patterns depends on pedogenesis besides soil mobilization

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Section: Land Use and Vegetation Cover Effectssupporting

confidence: 86%

Lateral mobilization of soil carbon induced by runoff along karstic slopes

Gaspar

Mabit

Lizaga

et al. 2020

Journal of Environmental Management

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“…As the largest terrestrial carbon pool, the soil carbon pool is approximately 3.3 times the size of the atmospheric pool and 4.5 times the size of the biotic pool (Lal 2004a). Soil erosion and the subsequent transport of sediments by rivers represent a key pathway for soil carbon lateral transfer at the land surface, which has a profound effect on the carbon budget of terrestrial ecosystems (Ludwig et al 1996;Li et al 2018;Wang et al 2019). However, propositions that soil erosion induces a carbon source or sink have been highly debated (Lal and Pimentel 2008).…”

Section: Introductionmentioning

confidence: 99%

Soil erosion affects variations of soil organic carbon and soil respiration along a slope in Northeast China

Zhang

Wang

et al. 2019

Ecol Process

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Background: Although soil erosion plays a key role in the carbon cycle, a holistic and mechanistic understanding of the soil erosion process within the cycle is still lacking. The aim of this study was therefore to improve our mechanistic understanding of soil organic carbon (SOC) and soil respiration dynamics through an experiment conducted in an eroding black soil farmland landscape in Northeast China. Results: The depositional profiles store 5.9 times more SOC than the eroding profiles and 3.3 times more SOC than the non-eroding profiles. A linear correlation between the SOC and 137 Cs (Caesium-137) was observed in our study, suggesting that the SOC decreased with increased soil erosion. Furthermore, the fractions of intermediate C and the microaggregate C were lowest at the eroding position and highest at the depositional position. In the depositional topsoil, the input of labile materials plays a promotional role in soil respiration. Conversely, in the subsoil (i.e., below 10 cm), the potential mineralization rates were lowest at the depositional position-due to effective stabilization by physical protection within soil microaggregates. The field results of soil surface respiration also suggest that the depositional topsoil SOC is prone to be mineralized and that SOC at this depositional context is stabilized at subsoil depth. In addition, the high water contents at the depositional position can limit the decomposition rates and stabilize the SOC at the same time. Conclusions:The findings from this study support that a majority of the SOC at footslope is stored within most of the soil profile (i.e., below 10 cm) and submitted to long-term stabilization, and meanwhile support that the depositional profile emits more CO 2 than the summit due to its high amount and quality of SOC.

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“…SDR within a range 0.1–1 is positively correlated with the degree of erosion (Table ) (Yue et al, ), and it was used to partition the eroded soil into deposition over the land in each river basin. Eventually, the soil deposition is the difference between soil erosion and sediment transported into the rivers (Wang et al, ). The county‐level soil deposition rates ( D s , t km −2 yr −1 ) and soil deposition of each river basin ( D , t yr −1 ) can be derived as

D_{s ((), j)} = ((), \sum_{i = 1}^{6} ((), 1 - {SDR}_{(i)}) \times A_{m ((), i, j)} \times E_{m ((), i)}) / A_{s ((), j)},

D = \sum_{j = 1}^{N} D_{s ((), j)} \times A_{c ((), j)},

…”

Section: Methodsmentioning

confidence: 99%

Increased Lateral Transfer of Soil Organic Carbon Induced by Climate and Vegetation Changes Over the Southeast Coastal Region of China

Liu

Wang

et al. 2019

JGR Biogeosciences

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Soil erosion and the subsequent lateral movement of soil carbon profoundly affect the spatial pattern of carbon sources and sinks in terrestrial ecosystems. The eight river basins of Fujian Province considered in this study are an important part of the southeastern coastal river basin of the ninth largest river system in China. In recent years, the erosion of soil and soil organic carbon in the southeast coastal region of China is not ideal owing to the high and concentrated rainfall, natural vegetation destruction, and other reasons. In this study, the soil organic carbon erosion and deposition rates related to erosion in the eight river basins of Fujian Province are quantified, and their spatial distribution characteristics are extracted. Based on the soil erosion rate from two national soil erosion surveys and topsoil carbon content from the Harmonized World Soil Database, we estimated that the lateral soil organic carbon erosion increased from 7.53 to 26.75 g C m−2 yr−1 in eight river basins of Fujian Province from 1995–1996 to 2010–2012. The soil organic carbon erosion rate in the eight river basins increased by 2.6 times, while the soil organic carbon erosion rate for the whole of China decreased by 44% during the same period. The increase in torrential rain and decrease in vegetation cover in the southeastern coastal areas largely contributed to the erosion of soil and soil organic carbon. The lateral transfer rate of soil organic carbon may be further exacerbated by the increase of torrential rain in the southeastern coastal areas of China.

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Redistribution of Soil Organic Carbon Induced by Soil Erosion in the Nine River Basins of China

Cited by 21 publications

References 75 publications

Lateral mobilization of soil carbon induced by runoff along karstic slopes

Lateral mobilization of soil carbon induced by runoff along karstic slopes

Soil erosion affects variations of soil organic carbon and soil respiration along a slope in Northeast China

Increased Lateral Transfer of Soil Organic Carbon Induced by Climate and Vegetation Changes Over the Southeast Coastal Region of China

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