scholarly journals Effects of Land Use and Slope Gradient on Soil Erosion in a Red Soil Hilly Watershed of Southern China

2015 ◽  
Vol 7 (10) ◽  
pp. 14309-14325 ◽  
Author(s):  
Zhanyu Zhang ◽  
Liting Sheng ◽  
Jie Yang ◽  
Xiao-An Chen ◽  
Lili Kong ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Southern China ◽  
Red Soil ◽  
Slope Gradient ◽  
Hilly Watershed ◽  
Effects Of Land Use

Estimating Medium-Term Soil Erosion Rates under Different Types of Land Use in Red Soil Region of Jiangxi, Southern China Using 137Cs Technique

2012 ◽  
Vol 518-523 ◽  
pp. 4716-4720 ◽  
Author(s):  
Ming Li Zhang ◽  
Ming Gao ◽  
Biao Xie ◽  
Hao Yang
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Southern China ◽  
Red Soil ◽  
Medium Term ◽  
Erosion Rates ◽  
Soil Erosion Rate ◽  
Bare Land ◽  
Type Of Land Use ◽  
Upper Slope

Soil erosion has been recognized as one of the major environmental problem in red soil region of southern China. The spatial variation of soil erosion was studied using 137Cs technique at three sites (site A, site B, site C) under different type of land use in Jiangxi province. To understand the spatial distribution of soil erosion is important for taking proper soil and water conservation measures. 280 samples were collected at three sites. Medium-term average soil erosion rates estimated for dry farmland is 83.1 kg ha-1 a-1 at site A, and that for paddy fields with terraces on the middle-lower slope is 79.2 kg ha-1 a-1 at site B. Among the uncultivated lands, the average soil erosion rate of bare land is 3700 kg ha-1 a-1 on the upper slope at site A, that of woodland covered with masson pines on the upper slope is 1106 kg ha-1 a-1 at site B and that of economic forest that covered with orchard is 1380.5 kg ha-1 a-1 at site C. On the whole, the soil erosion rate of cultivated land is lower than that of uncultivated land. Bare land, woodland and orchard are the three main sources of soil erosion in red soil region of southern China. Protective measures of cultivated land, such as terraces, field ridge and ditch beside the land, had been demonstrated effectively in controlling soil erosion. The findings provide more information on agricultural land under different type of land use and managed measures which play an important role in controlling the soil loss in Southern China to a certain degree.

Interactive effects of land use and soil erosion on soil organic carbon in the dry-hot valley region of southern China

2021 ◽  
Author(s):  
Yawen Li ◽  
Xingwu Duan ◽  
Ya Li ◽  
Yuxiang Li ◽  
Lanlan Zhang
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Southern China ◽  
Soil Depth ◽  
Erosion Rates ◽  
Land Use Types ◽  
Study Results ◽  
Effects Of Land Use

<p>Changes in land use can result in soil erosion and the loss of soil organic carbon (SOC). However, the individual contribution of different land use types on SOC variability as well as the combined impacts of land use and soil erosion are still unclear. The aims of the present study were to: (1) evaluate soil erosion and SOC contents under different land use types, (2) identify the influences of soil depth and land use on SOC content, and (3) determine the contribution of land use and soil erosion on SOC variability. We assessed the SOC and total soil nitrogen (TSN) contents under three types of land use in the dry-hot valley in southern China. Caesium-137 (<sup>137</sup>Cs) and excess lead-210 (<sup>210</sup>Pb<sub>ex</sub>) contents were also measured to determine soil-erosion rates. Land use was found to significantly affect soil erosion, and erosion rates were higher in orchard land (OL) relative to farmland (FL), which is in contrast with previous study results. SOC and TSN contents varied significantly between the three land use types, with highest values in forest land (FRL) and lowest values in OL. SOC was found to decrease with decreasing soil depth; the highest rate of reduction occurred in the reference site (RS), followed by FRL and FL. The interaction between soil erosion and land use significantly impacted SOC in the soil surface layer (0–12 cm); the direct impact of soil erosion accounted for 1.5% of the SOC variability, and the direct or indirect effects of land use accounted for the remainder of the variability. SOC content in deep soil was mainly affected by factors related to land uses (89.0%). This quantitative study furthers our understanding on the interactive mechanisms of land use and soil erosion on changes in soil organic carbon.</p>

scholarly journals Identifying Human-Induced Spatial Differences of Soil Erosion Change in a Hilly Red Soil Region of Southern China

2019 ◽  
Vol 11 (11) ◽  
pp. 3103
Author(s):  
Dong Huang ◽  
Xiaohuan Yang ◽  
Hongyan Cai ◽  
Zuolin Xiao ◽  
Dongrui Han
Keyword(s):  
Soil Erosion ◽  
Human Impact ◽  
Human Impacts ◽  
Southern China ◽  
Red Soil ◽  
Jiangxi Province ◽  
Negative Effects ◽  
Gravity Center ◽  
Local Conditions ◽  
Spatial Differences

Soil erosion (SE) processes are closely related to natural conditions and human activities, posing a threat to environment and society. Identifying the human impact on regional SE changes is increasingly essential for pertinent SE management. Jiangxi province is studied here as a representative area of hilly-red-soil regions within southern China. The main objectives of this study were to investigate the changing trend of SE within Jiangxi and identify human impacts on regional SE change from the perspective of spatial differences, through a new approach based on a gravity-center model. Our results showed that SE status presented an overall amelioration from 1990 to 2015, while the average soil erosion modulus (SEM) declined from 864 to 281 Mg/(km2·a). Compared to the situation under human and natural impacts, human-induced spatial differences of SE change demonstrated that the western and northwest regions showed stronger negative effects; the southern region shifted towards negative effects; the northeast region presented a much weaker negative effect. Our results indicated that 4 cities with strong negative effects need more attention in further SE management suited to their local conditions and development, and also suggested that the approach based on a gravity-center has potential for identifying the human impact on regional SE change from the perspective of spatial patterns.

scholarly journals Effects of land use, slope gradient, and soil and water conservation structures on runoff and soil loss in semi-arid Northern Ethiopia

2013 ◽  
Vol 34 (3) ◽  
pp. 236-259 ◽  
Author(s):  
Gebeyehu Taye ◽  
Jean Poesen ◽  
Bas Van Wesemael ◽  
Matthias Vanmaercke ◽  
Daniel Teka ◽  
...  
Keyword(s):  
Land Use ◽  
Water Conservation ◽  
Soil Loss ◽  
Soil And Water Conservation ◽  
Northern Ethiopia ◽  
Slope Gradient ◽  
Runoff And Soil Loss ◽  
Effects Of Land Use ◽  
Semi Arid ◽  
Soil And Water

scholarly journals Effects of Urbanization on Watershed Evapotranspiration and Its Components in Southern China

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 645 ◽  
Author(s):  
Qingzhou Zheng ◽  
Lu Hao ◽  
Xiaolin Huang ◽  
Lei Sun ◽  
Ge Sun
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Land Surface ◽  
Southern China ◽  
Hydrologic Model ◽  
Water Evaporation ◽  
Water Yield ◽  
Positive Trend ◽  
Significant Downward Trend ◽  
Effects Of Land Use

Understanding the effects of land use change on evapotranspiration (ET) and its partitioning to transpiration and evaporation is important for accurately evaluating the likely environmental impacts on watershed water supply, climate moderation, and other ecosystem services (e.g., carbon sequestration and biodiversity). This study used a distributed hydrologic model, MIKE SHE, to partition evapotranspiration into soil evaporation, transpiration, ponded water evaporation, and interception, and examined how the ET partitions affected the water balance in the Qinhuai River Basin from 2000 to 2013. Simulated daily ET was compared to measurements at an eddy flux research site during 2016–2017 (R2 = 0.72). Degradation in rice-wheat rotation fields and expansion of impervious surfaces impacted not only total watershed evapotranspiration, which showed a significant downward trend (p < 0.05), but also its partitioning. A significant (p < 0.01) decrease in transpiration was detected. Ponded water evaporation was the only ET partition that exhibited a significant positive trend (p < 0.05). We concluded that the reduced transpiration as a result of land use and land cover change was the primary factor driving the variation of watershed scale evapotranspiration. In addition, there was an increase in annual water yield (23%) as a response to significant reduction in ET (7%) due to a 175% expansion of urban area in the study watershed. Our study provided insights to the mechanisms of land surface–water cycle interaction and better understanding of the effects of land use change on urban micro-climate such as “urban dry island” and “urban heat island” effects.

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