Microstructure changes of red clay during its loss and leakage in the karst rocky desertification area

Tang, Yiqun; Sun, Kai; Zhang, Xiaohui; Zhou, Jie; Qi, Yang; Liu, Qi

doi:10.1007/s12665-016-5419-6

Cited by 38 publications

(15 citation statements)

References 24 publications

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“…The karst mountain environment is fragile, with large variations in topography and surfaces (Xiao et al, 2017; Zhang et al, 2015). The total area of rocky desertification in Guizhou has increased from 8,806.4 km 2 in 1978 to 24,700 km 2 in 2010 owing to the population surge in Guizhou and combined effects of the land use, soil aggregate characteristics, pore surface, and soil leakage (Tang et al, 2016). Extensive data related to rocky desertification formation factors, distribution characteristics, and its risk evaluation have been reported (Bai, Zhang, Chen, & He, 2010; Dai, Peng, Zhao, Shao, & Yang, 2017).…”

Section: Introductionmentioning

confidence: 99%

Factors influencing the evolution of human‐driven rocky desertification in karst areas

2020

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Karst rocky desertification has become one of the most important e‐environmental problems in China. The mechanisms of rocky desertification caused by land resources use, settlement expansion, population growth, and corresponding ecological responses are unclear. High‐resolution images of a typical karst plateau (Houzhai River Basin) acquired in 1978, 2005, and 2010 and data samples collected in the field in 2015 were used to quantitatively study the factors governing the evolution of rocky desertification driven by human activities. They comprehensively reveal its causes and influencing factors. Results suggest that the rocky desertification in the eastern and southern parts was, generally, more severe than in the western and northern parts of the study region. In the period from 1978 to 2015, no significant changes in the degree of (moderate) rocky desertification were observed. However, decreasing trends were observed for the no‐rocky areas, and slight decrease in rocky areas. The comprehensive indices of rocky desertification in 1978, 2005, 2010, and 2015 were 1.33, 1.24, 1.22, and 1.24, respectively. The rock outcrops in the no‐rocky desertification and potential rocky desertification areas were closely associated with the gravel content, slope gradient, and soil thickness, whereas those in the slight, moderate, and severe rocky desertification areas were primarily associated with the land use, gravel content, and slope gradient. The results suggest that the land use and human settlement were important factors determining the rocky desertification. The rocky desertification in the study area has improved during the period from 1978 to 2015. The main contribution to this improvement originated from the change in land use patterns. Therefore, reasonable management of land use and human settlement distribution can effectively reduce the rocky desertification in a karst area.

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Section: Introductionmentioning

confidence: 99%

Factors influencing the evolution of human‐driven rocky desertification in karst areas

2020

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“…Puding County is a typical plateau karst area with complex and diverse topography spatial distribution [ 28 ]. A shallow layer of soil, high rock coverage, and discontinuous soil mantle in this area lead to a great negative correlation between rock coverage, gravel content, and SOC content in karst areas [ 29 ]. SOC content in the cultivated land is in the fragmented spatial distribution in general.…”

Section: Discussionmentioning

confidence: 99%

Soil Organic Carbon Dynamics and Driving Factors in Typical Cultivated Land on the Karst Plateau

Zhang

et al. 2020

IJERPH

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Due to the impacts of unwise industrial agriculture, extreme precipitation events are increasing in frequency and are accelerating the process of global warming in the karst area. The dynamic change in soil organic carbon (SOC) and its driving factors in cultivated land in the last 35 years were studied by using data from the second national soil survey of China and measurements made in 2015. The results indicated that the SOC per unit area of cultivated land increased by 32.45 × 103 t in the last 35 years in the study area, exhibiting basically the same levels and a slight increasing trend, and the annual average change rate was 0.02 kg C·hm−2·a−1. In terms of spatial distribution, carbon loss areas were mainly concentrated in the middle northern region, western region, and scattered eastern regions of the county. The main factors affecting the change in SOC in the cultivated land in the study area in the last 35 years include nitrogen fertilizer application, stubble, soil thickness, soil total nitrogen, C/N, rock coverage, gravel content, soil organic carbon density (SOCD1980), etc. This study will provide a database for the management of SOC in cultivated land in the future.

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“…Indeed, some studies have proven that soil particles are carried by rainfall runoff leakage into well‐developed karst cracks. These particles interact with each other: They are sifted, rearranged, and eventually piled up (Tang et al, ). The different effects of fissures filled with soils and open fissures and the mechanisms of water and soil transport in underground pore fissures require further study.…”

Section: Discussionmentioning

confidence: 99%

Surface erosion and underground leakage of yellow soil on slopes in karst regions of southwest China

et al. 2018

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Surface erosion and underground leakage loss simultaneously exist on slopes with a double‐layered structure (surface and underground) and have caused rocky desertification in karst regions. Because of the great difficulty of directly determining the underground leakage loss of soil and water, soil erosion processes in this region remain unclear, especially underground leakage loss. The aim of this study was to reveal the plot‐scale characteristics of surface soil erosion and underground leakage loss of yellow soils on karst slopes. Simulated rainfall tests and field runoff plot monitoring were conducted to achieve this aim. We found that surface erosion formed on steep slopes (30°) or at greater rainfall intensities (over 50 mm hr−1) and that surface runoff and surface soil loss dominated the total runoff and soil loss on karst slopes at greater rainfall intensities. However, underground leakage loss always occurred at different slopes and rainfall intensities. For small rainfall intensity cases (lower than 80 mm hr−1), underground runoff and underground soil leakage loss dominated the total runoff and soil loss and showed an underground runoff ratio of over 90% and an underground soil leakage ratio of over 44%. Rainfall intensity had significant effects on surface runoff depth and surface soil loss rates but an insignificant influence on underground leakage loss. Slope gradient and slope length influenced the runoff yield, and slope degree had a greater effect on the surface soil loss than had slope length. This study improves our understanding of surface erosion and underground leakage loss in karst rocky desertification regions.

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Microstructure changes of red clay during its loss and leakage in the karst rocky desertification area

Cited by 38 publications

References 24 publications

Factors influencing the evolution of human‐driven rocky desertification in karst areas

Factors influencing the evolution of human‐driven rocky desertification in karst areas

Soil Organic Carbon Dynamics and Driving Factors in Typical Cultivated Land on the Karst Plateau

Surface erosion and underground leakage of yellow soil on slopes in karst regions of southwest China

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