scholarly journals Assessment of Soil loss Tolerance limit to Latosol, Argisol and Cambisolin the southern Minas Gerais state

2019 ◽  
Vol 11 ◽  
pp. 1-6
Author(s):  
Guilherme Henrique Expedito Lense ◽  
Rodrigo Santos Moreira ◽  
Taya Cristo Parreiras ◽  
Luis Felipe Pigatto Miranda Silva ◽  
Alexandre Elias de Miranda Teodoro ◽  
...  
Keyword(s):  
Land Use Planning ◽  
Soil Loss ◽  
Crop Production ◽  
Minas Gerais ◽  
Tolerance Limit ◽  
Mitigation Measures ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
Erosion Mitigation ◽  
T Values

Soil Loss Tolerance (T) reflects the maximum erosion rate that still allows a sustainable level of crop production. The T limit can be used to support the conservationist land-use planning and to propose erosion mitigation measures. In this context, we aim to determine the Soil Loss Tolerance limit to different soil classes located at the Coroado Stream Subbasin, southern Minas Gerais, Brazil. The soil classes of the subbasin area was classified as Dystrophic Red Latosols - LVd (90.0%), Eutrophic Red-Yellow Argisols - PVAe (5.4%), and Dystrophic Tb Haplic Cambisols - CXbd (1.9%). The following attributes were used to determine the T limits: texture, depth, density, permeability, and organic matter. To analyzing these parameters, we collect soil samples at 18 points distributed along the subbasin area. T values ranged from 4.75 to 7.40 Mg ha-1 year-1, with the lowest limit observed for CXbd (4.75 Mg ha-1 year-1). These results indicate that the Cambisol should be prioritized in the adoption of conservation practices to reduce water erosion and to maintain soil loss levels at acceptable rates. Latosols, Argisols, and Cambisols are the most common soils in the Brazilian territory. Thus, the results provided by the work can be used as a reference to monitoring the erosion process and evaluate the sustainability of agricultural activities in Brazil.

Assessment of the spatial distribution of global soil loss tolerance by using the productivity index method

2020 ◽  
Author(s):  
Lizhi Jia ◽  
Wenwu Zhao
Keyword(s):  
Land Use ◽  
Soil Loss ◽  
Global Scale ◽  
Productivity Index ◽  
Soil Productivity ◽  
Index Method ◽  
Land Use Types ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
T Values

<p>The soil loss tolerance (T value) is the ultimate criterion for determining whether a soil has potential erosion risks. While the existing T value criteria are mainly on national scale, and lack of consideration of the differences in soil erosion, soil properties and soil productivity between different types of land use. We calculated the global T value by using the productivity index method. The global T values ranged from 0.84 to 4.99 Mg ha<sup>-1</sup> yr<sup>-1</sup>, with an average of 1.49 Mg ha<sup>-1</sup> yr<sup>-1</sup>. The distribution of T values in global scale demonstrated significant spatial differences, and the range of T values in most regions of the land (98.23%) was between 1.0 and 2.0 Mg ha<sup>-1</sup> yr<sup>-1</sup>. The mean T values varied from c ontinent to continent, with Africa and Oceania having higher mean T values than other continents. The T values between different land use types varied widely, and the T values of five land use types were as follows: cropland (1.67 Mg ha<sup>-1</sup> yr<sup>-1</sup>) > shrubland (1.61 Mg ha<sup>-1</sup> yr<sup>-1</sup>) > grassland (1.59 Mg ha<sup>-1</sup> yr<sup>-1</sup>) > forestland (1.38 Mg ha<sup>-1</sup> yr<sup>-1</sup>) > wetland (1.28 Mg ha<sup>-1</sup> yr<sup>-1</sup>).</p>

scholarly journals Evaluating of the spatial heterogeneity of soil loss tolerance and its effects on erosion risk in the carbonate areas of southern China

Solid Earth ◽  
2017 ◽  
Vol 8 (3) ◽  
pp. 661-669 ◽  
Author(s):  
Yue Li ◽  
Xiao Yong Bai ◽  
Shi Jie Wang ◽  
Luo Yi Qin ◽  
Yi Chao Tian ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Spatial Heterogeneity ◽  
Soil Loss ◽  
Carbonate Rock ◽  
Southern China ◽  
Clastic Rock ◽  
Erosion Risk ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
The Relationship

Abstract. Soil loss tolerance (T value) is one of the criteria in determining the necessity of erosion control measures and ecological restoration strategy. However, the validity of this criterion in subtropical karst regions is strongly disputed. In this study, T value is calculated based on soil formation rate by using a digital distribution map of carbonate rock assemblage types. Results indicated a spatial heterogeneity and diversity in soil loss tolerance. Instead of only one criterion, a minimum of three criteria should be considered when investigating the carbonate areas of southern China because the one region, one T value concept may not be applicable to this region. T value is proportionate to the amount of argillaceous material, which determines the surface soil thickness of the formations in homogenous carbonate rock areas. Homogenous carbonate rock, carbonate rock intercalated with clastic rock areas and carbonate/clastic rock alternation areas have T values of 20, 50 and 100 t/(km2 a), and they are extremely, severely and moderately sensitive to soil erosion. Karst rocky desertification (KRD) is defined as extreme soil erosion and reflects the risks of erosion. Thus, the relationship between T value and erosion risk is determined using KRD as a parameter. The existence of KRD land is unrelated to the T value, although this parameter indicates erosion sensitivity. Erosion risk is strongly dependent on the relationship between real soil loss (RL) and T value rather than on either erosion intensity or the T value itself. If RL > > T, then the erosion risk is high despite of a low RL. Conversely, if T > > RL, then the soil is safe although RL is high. Overall, these findings may clarify the heterogeneity of T value and its effect on erosion risk in a karst environment.

scholarly journals Evaluating the spatial heterogeneity of soil loss tolerance and its effects on erosion risk in the carbonate areas of South China

2016 ◽  
Author(s):  
Yue Li ◽  
Xiaoyong Bai ◽  
Shijie Wang ◽  
Luoyi Qin ◽  
Yichao Tian ◽  
...  
Keyword(s):  
Spatial Heterogeneity ◽  
South China ◽  
Soil Loss ◽  
Carbonate Rock ◽  
Soil Thickness ◽  
Clastic Rock ◽  
Erosion Risk ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
The Relationship

Abstract. Soil loss tolerance (T value) is the ultimate criterion to determine the necessity of erosion control measures and ecological restoration strategy. However, the validity of this criterion in subtropical karst regions is strongly disputed. In this study, T value is computed based on soil formation rate by using a digital distribution map of carbonate rock assemblage types. Results indicated spatial heterogeneity and diversity in such values; moreover, a minimum of three criteria should be considered instead of only one criterion when investigating the carbonate areas of South China given that the “one region, one T value” concept may not apply to this region. T value is proportionate to the amount of argillaceous material in formations that determine surface soil thickness in homogenous carbonate rock areas; such values are 20 and 50 t/(km2 · a) in carbonate rock intercalated with clastic rock areas and 100 t/(km2 · a) in carbonate/clastic rock alternation areas. These three areas are each extremely, severely, and moderately sensitive to soil erosion. This erosion is extreme in karst rocky desertification (KRD) land and reflects the degree of erosion risk. Thus, the relationship between T value and erosion risk is determined with KRD as a parameter. The existence of KRD land is unrelated to T value, although this parameter indicates erosion sensitivity. In fact, erosion risk is strongly dependent on the relationship between real soil loss (RL) and T value rather than on either erosion intensity or the T value itself. If RL >> T, then erosion risk is high despite a low RL. Conversely, if T >> RL, the soil is safe although RL is high. Overall, these findings may clarify T value heterogeneity and its effect on erosion risk in a karst eco-environment; hence, innovative technological assessment solutions need not be invented.

scholarly journals Estimates of soil losses by the erosion potential method in tropical latosols

2019 ◽  
Vol 43 ◽  
Author(s):  
Guilherme Henrique Expedito Lense ◽  
Taya Cristo Parreiras ◽  
Rodrigo Santos Moreira ◽  
Junior Cesar Avanzi ◽  
Ronaldo Luiz Mincato
Keyword(s):  
Soil Loss ◽  
Management Practices ◽  
Conservation Management ◽  
Potential Method ◽  
Water Erosion ◽  
Tolerance Limits ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
Coffee Cultivation ◽  
Soil Losses

ABSTRACT Water erosion is one of the main problems faced in coffee cultivation, as it promotes environmental degradation and crop yield decrease. Erosion estimates support the planning of conservation management practices and allowing determining the rates of soil losses. Thus, the objective of this paper was to estimate the soil loss by water erosion using the Erosion Potential Method in a sub-basin predominantly covered by coffee cultivation and then to compare the results with the Soil Loss Tolerance limits. The study area is the Coroado Stream Sub-basin, located at Alfenas Municipality, south of Minas Gerais, Brazil. The sub-basin presented an Erosion Coefficient of 0.272, indicating a predominance of low-intensity erosion. The total soil loss estimate was 1,772.01 Mg year-1 with an estimated average of 1.74 Mg ha-1 year-1. Soil Loss Tolerance limits range from 4.75 to 7.26 Mg ha-1 year-1 and, according to the Erosion Potential Method, only 1.0% of the sub-basin presented losses above the limits. The areas with the highest slopes and bare soil concentrated the highest losses rates and should be prioritized in the adoption of mitigation measures. The Erosion Potential Method estimated soil losses in tropical edaphoclimatic conditions in a fast, efficiently and at low cost, supporting the adoption of conservation management practices.

scholarly journals INTER-RELATIONSHIP BETWEEN ERODIBILITY, SOIL TOLERANCE AND PYSICAL-CHEMICAL ATTRIBUTES ON NORTHWEST OF SÃO PAULO STATE

2019 ◽  
pp. 102-114
Author(s):  
César Gustavo Rocha Lima ◽  
Sâmia Momesso Marques ◽  
José Augusto de Lollo ◽  
Nídia Raquel Costa ◽  
Morel de Passos e Carvalho
Keyword(s):  
Soil Loss ◽  
Sao Paulo ◽  
Soil Erodibility ◽  
Spatial Correlations ◽  
Paulo State ◽  
São Paulo State ◽  
Soil Loss Tolerance ◽  
Loss Tolerance ◽  
Chemical Attributes ◽  
Physical And Chemical

Erosive processes are major environmental problems in soils and constitute a great conservation planning challenge. The knowledge of erodibility and soil loss tolerance, as well as their interactions with physical and chemical attributes of the soil may allow an important diagnostic for sustainable management. The aim of this study was to determine soil erodibility (K) and soil loss tolerance (T) for 32 kinds of soil in the Northwest Region of São Paulo State and assess the linear and spatial correlations between these factors and physical-chemical attributes. The evaluated attributes were: textural relationship (TR), particle density (PD), bulk density (BD), total porosity (TP), macro porosity (MA), micro porosity (MI), water capacity storage (WCS), organic matter (OM) and soil pH (pH). The results showed that K factor ranged from 0.0094 to 0.0758 Mg/ ha MJ mm, while T values ranged from 3.09 to 14.79 Mg /ha year. The erodibility and loss tolerance present significant interaction with the soil physical and chemical attributes, especially with the WCS and the TR that showed the best regression adjustments. In geostatistical point of view, the erodibility and soil loss tolerance also showed considerable spatial correlations with most soil physical properties, especially interactions with the TP and the TR, allowing the best mappings using cokriging technique. Thus, simple and relatively low cost approach preliminary soil erodibility can be adopted for large areas without complexes surveys and in situ tests. As well as long term climate data series, a common situation in large areas in less developed countries.

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