The effect of land use change and soil redistribution on soil organic carbon dynamics in karst graben basin of China

Lan, Gaoyong; Chun, Liu; Wang, Hua; Tang, Wei; Wu, Xiaofeng; Yang, Hui; Lin-ling, TU; Hu, Bill X.; Cao, Jianhua; Li, Qiang

doi:10.1007/s11368-021-02956-5

Cited by 13 publications

(4 citation statements)

References 61 publications

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“…The SOC content of woodland was higher than that of grassland and farmland in the Xinshui River watershed and Zhujiachuan watersheds (Figure 3). On the one hand, this was related to the implementation of a number of ecological measures, such as artificial afforestation and natural forest protection (Lan et al, 2021; Li et al, 2016). These measures have increased the area of woodland, improved soil texture, and enhanced soil nutrients (Chang et al, 2011; Wang et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Understanding the influencing factors and mechanisms (land use changes and check dams) controlling changes in the soil organic carbon of typical loess watersheds in China

et al. 2022

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Studying the distribution patterns and controlling mechanisms of soil organic carbon (SOC) based on the comprehensive performance of vegetation restoration and check dams at the watershed scale is important for understanding carbon cycling processes in nature. Two typical watersheds (Xinshui River and Zhujiachuan watershed) of the Loess Plateau were selected to evaluate the factors affecting the change in SOC content, and then the key factors were considered in the genetic algorithm‐support vector regression (GA‐SVR) model to predict SOC content. The results showed that the topography, vegetation, and soil characteristics had significant effects on the SOC content in the upland hillslopes, while the SOC content in the check dams was significantly affected by depth and soil characteristics. The soil organic carbon storage (TSOC) in the check dams could be evaluated and predicted by the vegetation index (NGRDI) and area of the subwatershed. The GA‐SVR model had good prediction accuracy and stable performance in predicting SOC content. According to the model simulation results, bulk density (BD), mean weight diameter (MWD), elevation, NGRDI, clay ratio (CR), and slope could be used to predict the surface SOC content of the Loess Plateau. Furthermore, depth, CR, MWD, BD, and median particle size (D50) could be applied in the model to predict the SOC content at different depths in the check dams. This study explored the potential control factors of SOC content and predicted SOC content from multiple angles, which can provide basic support for the study of the carbon sequestration on the Loess Plateau.

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Section: Discussionmentioning

confidence: 99%

Understanding the influencing factors and mechanisms (land use changes and check dams) controlling changes in the soil organic carbon of typical loess watersheds in China

et al. 2022

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“…However, Ma et al [31] observed that SOC at the depositional sites may be vulnerable to severe losses due to change in environmental factors. For example, a study in the karst graben basin of China by Lan et al [32] showed that there was a higher concentration of SOC at the depositional sites relative to the upland soils. However, there was also a higher decomposition rate of SOC at the depositional sites than at the eroding sites, particularly under the farmland conditions.…”

Section: Stages III To V: Deposition Deep Burial and Re-aggregation O...mentioning

confidence: 99%

Biophysical Controls That Make Erosion-Transported Soil Carbon a Source of Greenhouse Gases

Lal

2022

Applied Sciences

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Soil erosion is a selective process which removes the light fraction comprised of soil organic carbon (SOC) and colloidal particles of clay and fine silt. Thus, a large amount of carbon (C) is transported by erosional processes, and its fate (i.e., emission, redistribution, burial, and translocation into aquatic ecosystems) has a strong impact on the global carbon cycle. The processes affecting the dynamics of soil C emission as greenhouse gases (i.e., CO2, CH4, N2O), or its deposition and burial, vary among different stages of soil erosion: detachment, transport, redistribution, deposition or burial, and aquatic ecosystems. Specific biogeochemical and biogeophysical transformative processes which make erosion-transported carbon a source of C emission are determined by the type of erosion (rill vs. inter-rill in hydric and saltation erosion vs. air-borne dust in aeolian erosion), soil temperature and moisture regimes, initial SOC content, texture, raindrop-stable aggregates and water repellency, crusting, slope gradient, physiography and the slope-based flow patterns, landscape position, and the attendant aerobic vs. anaerobic conditions within the landscape where the sediment-laden C is being carried by alluvial and aeolian processes. As much as 20–40% of eroded SOC may be oxidized after erosion, and erosion-induced redistribution may be a large source of C. In addition, human activities (e.g., land use and management) have altered—and are altering—the redistribution pattern of sediments and C being transported. In addition to O2 availability, other factors affecting emissions from aquatic ecosystems include sub-surface currents and high winds, which may also affect CH4 efflux. The transport by aeolian processes is affected by wind speed, soil texture and structure, vegetation cover, etc. Lighter fractions (SOC, clay, and fine silt) are also selectively removed in the wind-blown dust. The SOC-ER of dust originating from sand-rich soil may range from 2 to 41. A majority of the C (and nutrients) lost by aeolian erosion may be removed by saltation. Even over a short period of three seasons, wind erosion can remove up to 25% of total organic C (TOC) and total N (TN) from the top 5 cm of soil. A large proportion of C being transported by hydric and aeolian erosional processes is emitted into the atmosphere as CO2 and CH4, along with N2O. While some of the C buried at the depositional site or transported deep into the aquatic ecosystems may be encapsulated within reformed soil aggregates or protected against microbial processes, even the buried SOC may be vulnerable to future loss by land use, management, alkalinity or pH, the time lag between burial and subsequent loss, mineralogical properties, and global warming.

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“…Karst areas are likely to suffer from water and groundwater pollution, soil erosion, rocky desertification, and landform changes due to their intrinsic characteristics and human activities (Lan et al, 2021). Compounded by impermeable limestone, the hydrological features in karst areas mostly comprise cracks and fissures, making surface water scarce and irrigation hardly to be made.…”

Section: Introductionmentioning

confidence: 99%

Karst of Gunung Sewu Land Use and Land Covers Dynamics: Spatio-Temporal Analysis

Reinhart

Putra²,

Rafida

et al. 2023

For. Geo.

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A study of karst land use and land cover dynamics is critical for managing karst areas, which provide many pivotal services for people. This study aims to study such dynamics, especially in relation to the karst of Gunung Sewu, due to its development as a new emerging sector. Using a mixed methods approach, the study combines spatial data analysis with qualitative analysis. Spatial analysis was performed to examine the dynamic of the land cover derived from 2013 and 2021 Landsat 8 imagery, analyzed with the Google Earth Engine tool, together with analysis of spatial patterns using Global Moran’s I and LISA. The spatial analysis results were complemented by a qualitative analysis of the environmental history and development trends, as an explanatory method. The land cover analysis reveals a conversion from vegetation to agriculture, while the spatial pattern analysis shows that such conversion has mostly taken place in the northern part of the study area of Wonosari Basin. The environmental history of teak forest exploitation and agriculture is key to understanding current land use related to the emerging tourism sector, which is fundamental to the region. To manage the negative impacts, sustainable land use with a firm policy framework urgently needs to be implemented.

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The effect of land use change and soil redistribution on soil organic carbon dynamics in karst graben basin of China

Cited by 13 publications

References 61 publications

Understanding the influencing factors and mechanisms (land use changes and check dams) controlling changes in the soil organic carbon of typical loess watersheds in China

Understanding the influencing factors and mechanisms (land use changes and check dams) controlling changes in the soil organic carbon of typical loess watersheds in China

Biophysical Controls That Make Erosion-Transported Soil Carbon a Source of Greenhouse Gases

Karst of Gunung Sewu Land Use and Land Covers Dynamics: Spatio-Temporal Analysis

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