Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Wang, Yunqiang; Han, Xiangwei; Jing-bo, Zhao; Zhang, Chencheng; Fang, Linchuan

doi:10.2136/sssaj2015.06.0220

Cited by 62 publications

(30 citation statements)

References 71 publications

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“…N treatment or have been extremely low in the Low N treatment, or a combination of the two. These variations in SOC content at depth underscore the importance of including subsoil in analysis when examining the effects of land management on C sequestration (Lorenz et al, 2010;Rumpel and Kögel-Knabner, 2010;Wang et al, 2016). Overall, 42 to 43% of total 0-to 100-cm SOC stocks were found to be present …”

Section: Depth Of Detectable Treatment Effectsmentioning

confidence: 89%

Apparent Stability and Subtle Change in Surface and Subsurface Soil Carbon and Nitrogen under a Long‐Term Fertilizer Gradient

Collier

Ruark

Naber

et al. 2017

Soil Science Soc of Amer J

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Uncertainty exists regarding the depth and extent to which agricultural practices affect soil properties, in particular soil organic C (SOC). In this study we examined the impact of 53 yr of continuous corn (Zea mays L.) receiving varying rates of inorganic N fertilizer with complete stover return on soil properties including SOC, total N, and bulk density (BD) to a depth of 1 m. In the treatment receiving virtually no applied N there was a significant reduction in soil N content at 0 to 30 cm over the study period, while the treatment receiving N in excess of recommended application levels was similar to the treatment receiving recommended rates of N fertilizer. Trends in SOC content were similar to those for total N, but a significant treatment effect was detectable throughout the entire 1-m soil profile sampled. Over the course of the study, all experimental fields appeared to have lost approximately 6 cm of topsoil through erosion, with the lowest N rate plots subsiding a further 2 cm due to compaction. Despite using disruptive management practices (moldboard plowing and application of anhydrous ammonia), declines in soil C and N content were not apparent for this soil type under conditions of low slope and the linear gains in productivity realized under the two higher N rate treatments. Thus N fertilizer was a benefit to this cropping system, rather than a detriment, and was sufficient to allow maintenancebut not building-of SOC.

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Section: Depth Of Detectable Treatment Effectsmentioning

confidence: 89%

Apparent Stability and Subtle Change in Surface and Subsurface Soil Carbon and Nitrogen under a Long‐Term Fertilizer Gradient

Collier

Ruark

Naber

et al. 2017

Soil Science Soc of Amer J

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“…On the contrary, the classical statistical method assumes that all observations are spatially independent without any correlation structure and therefore generates an overall response function between variables (Yang & Wendroth, ). The spatial associations among SOC, climate, soil, topography and land use could change with soil depth especially in the CLP region where there is a deep loess deposit (Wang et al, ). However, no state‐space model has been developed and applied in analyzing SOC in deep soil layers.…”

Section: Introductionmentioning

confidence: 99%

“…However, measurements of SOC in most of these studies are generally limited to the upper 100-cm soil depth, where most SOC is stored (Shi et al, 2013). The scarcity of SOC data below 100-cm soil depth has limited the estimation of deep soil C pools (Jobbágy & Jackson, 2000;Wang et al, 2015b;Wang et al, 2016). For example, Batjes (1996) reported a 60% increase in global SOC budget when data for the 100-200 cm soil layer were included.…”

Section: Introductionmentioning

confidence: 99%

“…slope gradient and aspect), land use type (farmland, grassland and forest), cultivation type (e.g. plant production and decomposition) and land management practice (Jobbágy & Jackson, 2000;Wei et al, 2010;Liu et al, 2011;Booker et al, 2013;Zhang et al, 2013;Wang et al, 2015a;Deng & Shangguan, 2016;Wang et al, 2016;Wu et al, 2016). However, the factors that contribute to the spatial variability of SOC content in deep soil layers at large spatial scale have not been well addressed.…”

Section: Introductionmentioning

confidence: 99%

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A State‐Space Analysis of Soil Organic Carbon in China's Loess Plateau

et al. 2017

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An accurate estimation of soil organic carbon (SOC) is important for the evaluation and management of carbon (C) flux in terrestrial ecosystems. However, there is little work on the spatial variability of SOC in deep soils and its driving factors. Thus, the objective of the study was to derive the primary factors dominating the spatial distribution of SOC in different soil layers with the use of the autoregressive state‐space approach. The concentration of SOC was measured to the depth of 500 cm (n = 86) along a south–north transect of China's Loess Plateau. The mean SOC of the 500‐cm soil profile generally decreased from south to north following the decreasing rainfall gradient. Based on the investigated factors, the state‐space model was able to capture 90.3–99.9% of the spatial variability of SOC in the various soil layers. According to the coefficients in the optimal state‐space model for each soil layer, climatic factors such as precipitation and temperature had a dominant control over the spatial distribution of SOC at shallow depths. However, both climatic and edaphic (e.g. soil texture) factors, and to a small extent land use, influenced the spatial behavior of SOC at the 40–200 cm soil depth. For soil layers below 200 cm, the importance of land use was revealed, and the spatial characteristics of SOC were together driven by land use, climatic and edaphic factors. This is critical for the management of soil C flux in deep soils and the C stock and cycle in terrestrial ecosystems. Table SI. Basic properties of soils and climate and elevation under three land uses along the south–north transect on the Loess Plateau (mean ± standard deviation). Note that SWC is gravimetric soil water content. Copyright © 2016 John Wiley & Sons, Ltd.

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“…(5) and (6)) between SOC and BD (Wu et al , 2003) which was commonly accepted (Guo and Gifford, 2002;Deng et al , 2014a) if there was only the SOC. The input variables needed in this model are much less than Model6 (Wang et al , 2016) but had a similar R 2 (Table.1). BD = -0.1229 × ln (SOC) + 1.2901 (for SOC < 6%) (5) BD = 1.3774 × e -0.0413SOC (for SOC > 6%) (6) Transform and estimation of SOC and SWC in deep soil layers Of the data related SOC collected from the literature, the SOC stocks units were all transformed into "Mg ha -1 ".…”

Section: Estimation and Validation Of Soil Bulk Densitymentioning

confidence: 99%

Trade-off between soil water maintenance and carbon sequestration during the implementation of ecological restoration programs in semi-arid Loess Plateau

Liu

et al. 2020

Preprint

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Converting degraded ecosystems into perennial vegetation in water-limited regions creates potentially conflicting demands for soil water maintenance and carbon sequestration. Current understanding of these competing demands remains still limited. In this study, to quantify the trade-off between them resulting from land-use conversion (converting cropland into forest, shrub and grassland usually) in the Loess Plateau, 2775 observations for soil organic carbon (SOC) stocks (to a depth of 100 cm) and 2654 observations for soil water storage (SWS) (to a depth of 500 cm) from peer-reviewed papers and measured data were synthesized. Results showed that (1) Land-use conversion influenced the trade-off greatly, and in general, converting cropland into natural grassland and evergreen trees performed relatively better in carbon sequestration and soil water maintenance; (2) In rainfall zone less than 550 mm, natural grassland exhibited higher capability in increasing SOC stock but maintaining a lower SWS depletion while forest was a better choice in rainfall greater than 550 mm; (3) With restoration age increasing, SOC stock and SWS depletion both increased significantly, and nevertheless natural grassland appeared to be sustainable and stable to achieve a win-win result. Moreover, with ages increasing, an accumulation of 0.7 Mg ha-1 SOC stock in the upper 100 cm was associated with an approximately 5.14 mm SWS decrease in the 0-500 cm soil layers. Overall, this study provides practical insights for land and water managers on how to achieve the win-win results between soil-and water-related ecosystem services during ecological restoration in water-limited regions.

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Soil Organic Carbon Stocks in Deep Soils at a Watershed Scale on the Chinese Loess Plateau

Cited by 62 publications

References 71 publications

Apparent Stability and Subtle Change in Surface and Subsurface Soil Carbon and Nitrogen under a Long‐Term Fertilizer Gradient

Apparent Stability and Subtle Change in Surface and Subsurface Soil Carbon and Nitrogen under a Long‐Term Fertilizer Gradient

A State‐Space Analysis of Soil Organic Carbon in China's Loess Plateau

Trade-off between soil water maintenance and carbon sequestration during the implementation of ecological restoration programs in semi-arid Loess Plateau

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