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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

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2018 Impact Factor: 1.205

Front Earth Sci    0, Vol. Issue () : 150-161    https://doi.org/10.1007/s11707-011-0158-1
RESEARCH ARTICLE
Assessment of soil erosion under woodlands using USLE in China
Changshun ZHANG1(), Gaodi XIE1, Chunlan LIU2, Chunxia LU2
1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; 2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China
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Abstract

Universal Soil Loss Equation (USLE), originally developed by the USDA for agricultural lands and then used throughout the world, was applied in mountainous forest terrain in China. The woodland area was divide into 100 m × 100 m grid cells. The ArcInfo 9.2 GIS software provided spatial input data was used to predict the spatial distribution of the average annual soil loss on grid basis. The average rainfall erositivity factor (R) for national woodlands was found to be 21–1798 MJ·mm·ha-1·h-1·a-1. The soil erodibility factor (K) with a magnitude of 0.043 t·ha·h· ha-1·MJ-1·mm-1 is the highest for Chinese woodland. Most of the slope length factors (LS) were less than 5 for the national woodland. The highest and lowest values of cover and management factor (C) were found out to be 0.0068 and 0.2550 respectively for coniferous woodland and orchard woodland. The value of conservation factor (P) was assigned to be 1 for Chinese woodlands because of scarcity of conversation practice data at the national scale. The average annual soil loss of the national woodland areas was 3.82 t·km-2·a-1. About 99.89% of Chinese woodland area was found out to be under slight erosion class, whereas it only resulted in about 41.97% of soil loss under woodland area, and 58.03% of soil loss occurred under high erosion potential zone, namely more than 5 t·ha-1·a-1. Therefore, those zones need immediate attention from soil conservation point of view. The results here are consistent with many domestic and oversea previous researches under mountainous forests or hilly catchments, thus we showed that the USLE can be applied to estimations of soil erosion for Chinese woodlands at the national scale.

Keywords conservation factor      cover and management factors      slope length factor      soil erodibility factor      Universal Soil Loss Equation (USLE)      woodland      soil erosion     
Corresponding Author(s): ZHANG Changshun,Email:zhcs2001@163.com   
Issue Date: 05 June 2011
 Cite this article:   
Changshun ZHANG,Gaodi XIE,Chunlan LIU, et al. Assessment of soil erosion under woodlands using USLE in China[J]. Front Earth Sci, 0, (): 150-161.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-011-0158-1
https://academic.hep.com.cn/fesci/EN/Y0/V/I/150
ClassificationGIS data typeScale
Plant distributionPolygon coverage1∶1000000
PrecipitationPolygon coverage1∶1000000
Soil dataPolygon coverage1∶1000000
The digital elevation modelGird90 m × 90 m
Tab.1  Data layer of study area
Fig.1  Spatial distribution of forest types
Fig.2  Spatial distribution of Chinese DEM
Fig.3  Spatial distribution of rainfall factor ()
Fig.4  Spatial distribution of soil erodibility factor ()
Fig.5  Spatial distribution of topographic factor ()
Fig.6  Spatial distribution of cover and management factor ()
Forest typesC valueLiteratureRemark
Coniferous forest0.0068(Kitahara et al., 2000)1)
Conifer-broadleaved mixed forest0.00732)
Broadleaved forest0.00773)
Bamboo forest0.04004)
Shrub forest0.0200(Roose, 1977)5)
Orchard forest0.2550(Dabral et al., 2008)6)
Tab.2  Cover and management factors for different forests
Factors and soil lossRangeArea/km2Area/%
R/(MJ· mm·ha-1·h-1·a-1)21-33784692.383.47
237-636561733.1622.99
637-829553138.3222.64
830-1031589944.1124.14
1032-1240487673.2219.96
1241-1798166414.366.80
Totala)2443595.55100.00
K/(t·ha·h·ha-1·MJ-1·mm-1)0.008-0.01233337.661.36
0.013-0.023296393.4812.09
0.024-0.0281182452.0248.22
0.029-0.033701119.5128.59
0.034-0.043238871.219.74
Totala)2452173.88100.00
LS (unitless)0-52444793.1499.68
6-103892.100.16
11-402954.110.12
41-80532.610.02
81-120196.570.01
>120346.990.01
Totala)2452715.52100.00
C (unitless)0.0068804545.232.54
0.007321959.960.89
0.0077683614.9927.65
0.0200923647.6637.36
0.040032939.261.33
0.2555435.610.22
Totala)2472142.68100.00
Tab.3  Distribution percentage of factors
Fig.7  Spatial distribution of annual soil loss in Chinese woodland
Fig.8  Soil loss (%) of different soil erosion classes to slope degree
Soil loss rate/(t·ha-1·a-1)Area/km2Area/%Soil erosion classSoil loss/(t·a-1)Soil loss/%
0-22433470.0799.81Very slight2624088.7328.15
2-52289.080.09Slight1289029.1813.83
5-101040.860.04Moderate944721.7310.13
10-20593.670.02High947255.3610.16
20-40333.580.01Very high992086.7210.64
40-80181.340.01Severe1040582.7411.16
>80114.630.00Very severe1485367.3215.93
Total2438023.23100.009323131.78100
Tab.4  Distribution percentage of soil loss
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