Soil carbon and nitrogen sources and redistribution as affected by erosion and deposition processes: A case study in a loess hilly-gully catchment, China

Lei, Chun; Li, Zhongwu; Chang, Xiaofeng; He, Jin; Nie, Xiaodong; Liu, Lin; Xiao, Huan; Wang, Dan-Yang; Hao, Peng; Zeng, Guangming

doi:10.1016/j.agee.2017.10.028

Cited by 93 publications

(40 citation statements)

References 66 publications

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“…In addition, the low concentrations of SOC and their labile components (DOC and MBC) in the E sites might be related to the breakdown of soil aggregates and the increased C mineralization rate during the process of organic matter transportation and deposition. This result was consistent with previous research and further confirmed that soil erosion decreases the soil C pool (Liu et al, ; Ritchie, Mccarty, Venteris, & Kaspar, ).…”

Section: Discussionsupporting

confidence: 93%

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed

Jiang

Xiao

et al. 2018

Land Degrad Dev

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Understanding the effect of soil erosion on soil carbon (C) fixation is of great significance for evaluating the complicated connection between land degradation and C cycle. To investigate erosion‐induced changes in autotrophic bacterial community and microbial carbon dioxide (CO2) fixation, three typical eroding sites and three depositional sites were selected in the hilly red soil region of southern China with severe erosion. Positive responses of autotrophic microbial abundance to soil deposition were observed, whereas no obvious changes in microbial diversity were observed between eroding and depositional sites. The relative abundances of obligate autotrophic bacteria, such as Rhodopseudomonas and Pseudonocardia, were enhanced in the eroding sites. Deposition of organic matter‐rich soil was not conducive to the growth of obligate autotrophic bacteria. The average rate and amount of microbial CO2 fixation at the depositional sites (30.86 mg C km−2 year−1 and 0.05 g kg−1) were higher than those at the eroding sites (18.04 mg C km−2 year−1 and 0.025 g kg−1), which indicated that soil deposition significantly enhanced autotrophic microbial CO2 fixation. In addition, multiple stepwise linear regression showed that compared with microbial properties (abundance and diversity), dissolved organic carbon is a more important explanation factor for the change of microbial CO2 fixation rate (68.8%, P = 0.001).

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Section: Discussionsupporting

confidence: 93%

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed

Jiang

Xiao

et al. 2018

Land Degrad Dev

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“…Thus the level of that organic matter increased significantly through litter, root debris and their secretions. Meanwhile, with the improvement of soil structure, surface runoff, soil erosion, and soil nutrient loss was reduced (Liu et al, ). Second, the soil microbial activity strengthened as recovery years increased, and the soil nutrient conversion and storage were also further enhanced (Leon et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Multiple factors can influence sequestration and stability of SOC, including climate (Post, Emanuel, Zinke, & Stangenberger, ), management measures (Lal, ), vegetation restoration (Zhang, Dang, Tan, Cheng, & Zhang, ), and soil erosion (Liu et al, ; Xiao et al, ). Soils for agriculture have bright prospect for carbon sequestration by the change of land‐use patterns (Zhang et al, ), vegetation reforestation has been proposed an effective approach to increasing carbon sequestration in both vegetation and soils (Lal, ).…”

Section: Introductionmentioning

confidence: 99%

Soil organic carbon sequestration and its stability after vegetation restoration in the Loess Hilly Region, China

Wang

et al. 2020

Land Degrad Dev

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Vegetation restoration is widely recognized as a way to improve soil organic carbon (SOC) stock. However, whether these recovered carbons are stable is yet largely uncertain. Thus, we determined the sequestration and stability of SOC in soils with three different types (Caragana korshinskii (CA) aged for 10, 20, 36, and 47 years, Hippophae rhamnoides (HR) aged for 5, 10, 20, and 30 years, and Robinia pseudoacacia (RP) aged for 5, 10, 20, 37, and 56 years) to compare their SOC sequestration and stability in different depths in this study. The SOC content, SOC stock, very labile fraction of oxidizable carbon (C1), labile fraction of oxidizable carbon (C2), and carbon management index (CMI) in 0–30 cm depths of the three types increased over the chronosequence. The SOC stocks increased by 1.40–3.19 Mg ha−1 in CA during the 47‐year restoration, by 5.76–10.01 Mg ha−1 in HR during the 30‐year restoration and by 1.88–8.93 Mg ha−1 in RP during the 56‐year restoration, respectively, in 0–30 cm depths. The carbon stability index (SI) in 0–10 cm depth of CA, 0–30 cm depths of HR, and 0–50 cm depths of RP decreased with recovery time. Over the recovery time, SOC content, SOC stock, CMI, and SI were lower than those of nature forest (NF aged more than 100 years) in all restored sites at the later stage of recovery. SOC sequestration decreased, but its stability increased, with the soil depths. Overall, HR had a higher SOC sequestration rate and lower SI (0–30 cm) than CA and RP. Our results revealed that although the SOC sequestration appears enhanced over the restoration, but the SOC stability becomes lower, so that the recovery of these site to the level of NF may meet difficulties in this semiarid Loess Hilly Region.

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“…In the early stage of forest plantation, soil nitrogen, especially inorganic nitrogen, is easily lost; it thus cannot protect macroaggregates, and soil erosion is increased. However, a large amount of nitrogen cannot be absorbed by mature plants, causing soil acidification and erosion‐induced silt and sand losses in the second and third stages (Liu et al, ). Thus, this process leads to an increase in the k (Table and Figure a).…”

Section: Discussionmentioning

confidence: 99%

Factors Affecting the Spatial and Temporal Variations in Soil Erodibility of China

et al. 2019

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Soil erosion occurs extensively across China, leading to severe degradation of the land and ecosystem services. However, the spatial and temporal variations in soil erodibility (k) and the distribution of soil erosion across land use types and slopes remain unclear. We synthesized the results from 325 sites published in 152 literatures to analyze the factors affecting the k, such as land use type, climate, topography, soil, and vegetation restoration age. The results showed that areas with slopes >25° had a larger k factor (k = 0.1047) than did those with slope <6° (k = 0.0637) or 6–25° (k = 0.0832). The k from 2006 to 2011 (k = 0.0725) was higher than that from 1999 to 2005 (k = 0.058) and that from 2012 to 2016 (k = 0.0631). The k value initially increased with vegetation restoration age and then gradually decreased. Land use also had an impact on the k factor, with the k factor of cropland (k = 0.0697) being higher than that of grassland (k = 0.0663) but lower than that of forest (k = 0.0967). Across China, North Shaanxi, Heilongjiang, and South Guizhou, which are located in the Loess Plateau in Northwest China, the Black Soil region of Northeast China, and the Karst areas in Southwest China, respectively, were the three most severely eroded regions due to hydraulic erosion, frost‐thaw erosion, and high‐intensity erosion, respectively. Overall, the most important factors affecting the k were soil characteristics, followed by topography and climate. Among them, soil nitrogen and precipitation were the two most critical factors influencing the k.

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Soil carbon and nitrogen sources and redistribution as affected by erosion and deposition processes: A case study in a loess hilly-gully catchment, China

Cited by 93 publications

References 66 publications

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed

Soil organic carbon sequestration and its stability after vegetation restoration in the Loess Hilly Region, China

Factors Affecting the Spatial and Temporal Variations in Soil Erodibility of China

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Soil carbon and nitrogen sources and redistribution as affected by erosion and deposition processes: A case study in a loess hilly-gully catchment, China

Cited by 93 publications

References 66 publications

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO2 fixation in an eroded watershed

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO2 fixation in an eroded watershed

Soil organic carbon sequestration and its stability after vegetation restoration in the Loess Hilly Region, China

Factors Affecting the Spatial and Temporal Variations in Soil Erodibility of China

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Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed

Labile organic matter plays a more important role than the autotrophic bacterial community in regulating microbial CO₂ fixation in an eroded watershed