Soil Organic Carbon Density Spatial Distribution and Influencing Factors in a Karst Mountainous Basin

Zhang, Zhenming; Wang, Shijie; Huang, Xianfei

doi:10.15244/pjoes/69283

Cited by 14 publications

(8 citation statements)

References 28 publications

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“…The SOC and SOCS decreased with soil depth in the soil profile, and the reduction range was different due to different types of vegetation. The proportion of SOC and SOCS in 0-5 cm soil under different restoration measures was 38.96%~47.23% and 35.67%~45.28% respectively, which were consistent with previous research results and showed visible surface aggregation [32][33]48]. The main reason was that plant litter and roots were mostly distributed in the surface soil, and humus formed after decomposition was accumulated in the surface soil.…”

Section: Impact Of Different Vegetation Restorationsupporting

confidence: 90%

“…Karst refers to the geological process that is mostly carried out by the chemical dissolution action of water on water-soluble rocks (usually limestone, dolomite, or marble), and supplemented by the mechanical actions of erosion or latent erosion of flowing water and rock avalanche which is from above ground and underground landscape [31][32]. Karst landforms are distributed in soluble rock regions around the world, with a total area of approximately 510 million km 2 , accounting for 10% of the total area of the earth [31,33]. The karst area in southwest China centered on Guizhou, with an area of about 540,000 square kilometers, is one of the three largest karst areas in the world [31,[34][35].…”

Section: Introductionmentioning

confidence: 99%

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Response of Soil Organic Carbon and Its Active Fractions to Restoration Measures in the Karst Rocky Desertification Ecosystem, SW China

Bai¹,

Sheng²,

Hu³

et al. 2021

Pol. J. Environ. Stud.

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Soil organic carbon (SOC) is the dynamic medium of carbon transfer and the main way of carbon circulation in karst ecosystem, SOC and soil labile organic carbon (LOC) is essential for karst soil C cycling. There has been very little research about the differentiation of SOC and LOC in karst ecosystem. In this study, six typical restoration measures were investigated in the karst rocky desertification ecosystem, southwest China, including: restoration with Zanthoxylum bungeanums (HJ), restoration with Hylocereus undulates (HL), restoration with Pennisetum sinese (HZ), restoration with Medicago sativa (MX), restoration with Sabina chinensis (YB), and abandoned and natural recovery (LH). The SOC contents, SOC stocks, LOC contents (water soluble organic carbon (WSOC), easily oxidizable organic carbon (EOC), particulate organic carbon (POC), light fraction organic carbon (LFOC)), and the carbon pool management index (CPMI) were investigated. The results indicated that the SOC contents, SOCS and LOC contents of the six measures were the highest in YB, followed by the LH, and the two were significantly higher than the other four measures. The soil CPMI contents of 0-20 cm layer under the different restoration measures decreased in the following order: YB > HJ > MX > HL > HZ. Correlation analysis showed that SOC was positively correlated with soil LOC (P<0.01), and LOC was positively correlated with each other (P<0.01). These findings suggest that restoration with Sabina chinensis, abandoned and natural recovery are more conducive to the management and protection of karst ecological environment. Restoration with Zanthoxylum bungeanums can be used as a priority economic species for karst rocky desertification and mountain agricultural development in southwest China. Soil WSOC, EOC, POC, and LFOC can be used as effective indicators to reflect SOC pools, and soil CPMI can also be used as a sensitive indicator to reflect soil management.

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Section: Impact Of Different Vegetation Restorationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Response of Soil Organic Carbon and Its Active Fractions to Restoration Measures in the Karst Rocky Desertification Ecosystem, SW China

Bai¹,

Sheng²,

Hu³

et al. 2021

Pol. J. Environ. Stud.

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“…The Houzhai River Basin, is located in an area with typical karst landforms lateau landform, and the Basin is located in Puding County in the central part of Guizhou Province in Southwestern China. The Basin covers a total area of 75 km 2 in the watershed of the Yangtze River Basin and the Pearl River Basin (Wang et al, 2004; Zhang, Zhou, Wang, & Huang, 2017). The altitude of the study area is high in the southeast and low in the northwest, with a general altitude of 1,100–1,400 m. Thus, it exhibits relative height differences of 250–300 m and a maximum difference of 311 m. Triassic carbonate rocks are widely distributed in the Houzhai River area.…”

Section: Methodsmentioning

confidence: 99%

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

2020

Self Cite

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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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“…Sampling sites were designed using ArcGIS 10.3 on a relief map based on the grid method, and the designed scale was 150 m. Total of 1, 3180 grids were delineated, and 442 of those grids were non-tillage land. Sampling sites were located at the centre of each non-tillage grid [25]. Soil thickness, altitude, slope gradient, slope position, slope aspect, soil types, parent rock, vegetation and microhabitat of each non-tillage grid were investigated.…”

Section: Soil Samplingmentioning

confidence: 99%

Driving Factors and Prediction of Rock Desertification of Non-Tillage Lands in a Karst Basin, Southwest China

Huang¹,

Zhang²,

Zhou³

et al. 2021

Pol. J. Environ. Stud.

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Rocky desertification is seriously restricting the sustainable development of agricultural production and tourism industry in karst regions. This study focus on the characteristics of rocky desertification and its main driving factors on non-tillage lands in Houzhai River Basin of southwestern China. Artificial neural networks (ANNs) were employed in this study to identify the importance of different environmental factors on rocky desertification. The results showed that the rock outcrops in non-tillage lands ranged from 0.00 to 91.12% with a mean value of 19.10% in the Houzhai River Basin, and the rates of rock outcrops among different types of vegetation were ordered as: shrub grasslands (35.30%)>arbor forestlands (30.07%)>shrublands (23.13%)>arbour-shrub mixed forestlands (27.54%). With increases in slope gradient and altitude, the cover rate of rock outcrops became higher and rocky desertification became more serious. Based on ANNs analysis, the correlation coefficients between observed and predicted values of remaining data sets ranged from 0.828 to 0.998, which indicated that the importance of altitude, slope gradient, gravel content and soil bulk density are the dominant factors affecting soil erosion and thereby leading to the occurrence of rocky desertification in the Houzhai River Basin. In addition, ANNs combine with environmental factors can be a feasible way to predict tendency of rocky desertification in a karst regions.

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Soil Organic Carbon Density Spatial Distribution and Influencing Factors in a Karst Mountainous Basin

Cited by 14 publications

References 28 publications

Response of Soil Organic Carbon and Its Active Fractions to Restoration Measures in the Karst Rocky Desertification Ecosystem, SW China

Response of Soil Organic Carbon and Its Active Fractions to Restoration Measures in the Karst Rocky Desertification Ecosystem, SW China

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

Driving Factors and Prediction of Rock Desertification of Non-Tillage Lands in a Karst Basin, Southwest China

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