Spatial variability in soil organic carbon and its influencing factors in a hilly watershed of the Loess Plateau, China

Xin, Zhouping; Qin, Yunbin; Yu, Xinxiao

doi:10.1016/j.catena.2015.01.028

Cited by 130 publications

(47 citation statements)

References 55 publications

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“…In addition, anthropogenic activities in these areas have caused the degradation of terrestrial ecosystems (Bai et al 2014). In most cases, these anthropogenic activities have profound effects on soil properties, especially on soil organic carbon (SOC) and total nitrogen (TN) (Xin et al 2016;Zhang et al 2016;Yuan et al 2017;Wang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Soil organic carbon is considered as an important indicator to assess soil fertility and quality, because of its significant influences on soil physicochemical properties (Sullivan et al 2005;Wang et al 2015). Furthermore, SOC plays a major role in the global carbon cycle (Mirzaee et al 2016;Xin et al 2016;Chu et al 2018). As a key determinant of soil fertility and quality, TN also plays a vital part in generating and maintaining soil productivity in agricultural ecosystems (Wang et al 2015;Zhang et al 2016;Ma et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Yao

Deng

et al. 2019

J. For. Res.

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To obtain accurate spatial distribution maps of soil organic carbon (SOC) and total nitrogen (TN) in the Hetian Town in Fujian Province, China, soil samples from three depths (0-20, 20-40, and 40-60 cm) at 59 sampling sites were sampled by using traditional analysis and geostatistical approach. The SOC and TN ranged from 2.26 to 47.54 g kg -1 , and from 0.28 to 2.71 g kg -1 , respectively. The coefficient of variation for SOC and TN was moderate at 49.02-55.87% for all depths. According to the nuggetto-sill ratio values, a moderate spatial dependence of SOC content and a strong spatial dependence of TN content were found in different soil depths, demonstrating that SOC content was affected by both extrinsic and intrinsic factors while TN content was mainly influenced by intrinsic factors. Indices of cross-validation, such as mean error, mean standardized error, were close to zero, indicating that ordinary kriging interpolation is a reliable method to predict the spatial distribution of SOC and TN in different soil depths. Interpolation using ordinary kriging indicated the spatial pattern of SOC and TN were characterized by higher in the periphery and lower in the middle. To improve the accuracy of spatial interpolation for soil properties, it is necessary and important to incorporate a probabilistic and machine learning methods in the future study.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Yao

Deng

et al. 2019

J. For. Res.

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“…Steppes and deserts stock less SOC but are widely distributed, especially on the Loess Plateau. Researchers have studied SOC storage (W. Li, Cao, et al, ; Zhang & Shangguan, ) and distribution (W. Sun, Zhu, & Guo, ; J. Wang, Yang, & Bai, ; Xin, Qin, & Yu, ; Zhao et al, ) on the Loess Plateau, but the scale of this research was limited to nature reserves or watersheds.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale soil organic carbon mapping based on multivariate modelling: The case of grasslands on the Loess Plateau

Wang

Deng

et al. 2017

Land Degrad Dev

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The Loess Plateau is considered one of the world's regions with severe soil erosion. Grasslands are widely distributed on the Loess Plateau, accounting for approximately 40% of the total area.Soil organic carbon (SOC) plays an important role in the terrestrial carbon cycle in this region.We compiled more than 1,000 measurements of plant biomass and SOC content derived from 223 field studies of grasslands on the Loess Plateau. Combined with meteorological factors (precipitation and air temperature) and the photosynthetically active radiation factor, the topsoil SOC contents of grasslands were predicted using the random forest (RF) regression algorithm. biomass and temperature should receive more attention due to increasing C sequestration.

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“…The results show that the AGR was the primary SOC source. As a result of intensive agricultural cultivation, a considerable amount of litter, residue, and organic fertilizer remained in the cropland, and the SOC content in the AGR increased significantly (Xin et al, 2016). After the implementation of the GGP, cropland with a slope greater than 25° was converted into grassland or forest (Li et al, 2018), leading to intensified farming in the AGR.…”

Section: Discussionmentioning

confidence: 99%

“…The fraction modern of biospheric OC ( Fm bio ) is 1.23 in the AGR and 0.88 in the RES, which indicates that modern OC is a dominant component in the source area. The younger component of the AGR may be related to the high soil erosion rate and fresh crop residues caused by agricultural activities (Xin et al, 2016). Through calculation, we found that almost all the mobilized OC petro was buried in the sink area.…”

Section: Discussionmentioning

confidence: 99%

Soil Organic Carbon Redistribution and Delivery by Soil Erosion in a Small Catchment of the Yellow River Basin

et al. 2020

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Soil erosion modulates the atmospheric CO 2 level by affecting the redistribution of young biospheric organic carbon (OC bio ) and ancient petrogenic organic carbon (OC petro ) in different order streams. However, the fate of soil organic carbon (SOC) in low-order stream systems is still uncertain due to the complex influences of terrain, land uses, and anthropogenic disturbances. Here, we used the geochemical properties fingerprinting method and a radiocarbon-based two-member mixing model to clarify the source, budgets, and composition of SOC in a low-order stream catchment in the Yellow River basin. The results showed that the primary source of SOC in the catchment was agricultural activity area, which accounted for 68.5%. After vegetation restoration, the SOC delivery rate and loss rate decreased from 0.38 ± 0.06 to 0.26 ± 0.04 and 0.19 ± 0.06 to 0.14 ± 0.04 t·ha −1 ·yr −1 , respectively. The SOC mobilized by soil erosion in the source area was 1,085.8 ± 170.5 t from 1969 to 2015, and the SOC lost during the transport process was 552.9 ± 170.1 t. The lost carbon was dominated by OC bio , whereas the loss of OC petro was minimal. Soil erosion can mobilize the OC petro sequestered in terrestrial ecosystems and deliver it to a river system if it is not intercepted. The oxidation of OC petro during long-distance fluvial transport may represent a significant carbon source for atmospheric CO 2 on a geological timescale. This study contributes to our understanding of the carbon sink/source issue and quantifies the SOC budgets in stream systems.Plain Language Summary Understanding how soil erosion affects the redistribution and delivery of soil organic carbon (SOC) is essential for clarifying the source, budgets, and composition of SOC and helps us further understand the terrestrial carbon cycle. This study calculated the source of SOC based on differences in geochemical properties in different source areas. Then, we measured the radiocarbon ( 14 C) content to clarify the composition and fate of SOC during the erosion process. We found that the primary source of SOC in the catchment was the agricultural activity area and that agricultural activities and vegetation restoration were shown to significantly affect SOC redistribution. A large amount of modern organic carbon was lost during the transport process and may become an atmospheric CO 2 source over short timescales. Almost all ancient organic carbon is intercepted by the dam at the outlet. If there is no check dam, the remaining ancient organic carbon can be exported to the Yellow River and then oxidized during fluvial transport, leading to an increase in long-term atmospheric CO 2 levels. This research clarifies the influence of soil erosion on SOC redistribution and delivery and quantifies the source, budget, and composition of SOC in the low-order stream system.

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Spatial variability in soil organic carbon and its influencing factors in a hilly watershed of the Loess Plateau, China

Cited by 130 publications

References 55 publications

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Spatial variability of soil organic carbon and total nitrogen in the hilly red soil region of Southern China

Large‐scale soil organic carbon mapping based on multivariate modelling: The case of grasslands on the Loess Plateau

Soil Organic Carbon Redistribution and Delivery by Soil Erosion in a Small Catchment of the Yellow River Basin

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