[1]GAO Jiayong,LI Rui,YANG Pingping,et al.Spatial Distribution Characteristics and Main Influencing Factors of Soil Erodibility K Values in Guizhou Province[J].Research of Soil and Water Conservation,2022,29(05):77-84.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 05
Page number:
77-84
Column:
Public date:
2022-08-20
- Title:
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Spatial Distribution Characteristics and Main Influencing Factors of Soil Erodibility K Values in Guizhou Province
- Author(s):
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GAO Jiayong1,2, LI Rui1,2, YANG Pingping1,2, PAN Lidong1,2, HUANG Kai1,2
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(1.School of Karst Science, Guizhou Normal University, Guiyang 550001, China; 2.State Engineering Technology Institute for Karst Desertification Control, Guiyang 550001, China)
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- Keywords:
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soil erodibility; parent material; land use; altitude; spatial distribution; Guizhou Province
- CLC:
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S157.1
- DOI:
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- Abstract:
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In order to reveal the sensitivity of soil to erosion and clarify the spatial distribution characteristics of soil erodibility in Guizhou Province, based on the data of the Second National Soil Survey and soil type records of Guizhou, the soil erodibility K values of Guizhou Province were calculated by EPIC(erosion productivity impact calculator)model, and the soil erodibility K values of Guizhou Province were spatially interpolated by Kriging interpolation method in ArcGIS, so as to explore the change pattern and spatial distribution characteristics of soil erodibility, the influences of soil parent material, altitude and land use mode on K values were analyzed. The results show that:(1)the average K values of topsoils of various soil types in Guizhou Province ranged from 0.023 0 to 0.047 7 t·hm2·h/(MJ·mm·hm2), among which the K value of red clay was the largest, was 0.047 7 t·hm2·h/(MJ·mm·hm2), followed by tidal soil, which was 0.046 0 t·hm2·h/(MJ·mm·hm2), and the K value of newly deposited soil was the smallest, which was 0.023 0 t·hm2·h/(MJ·mm·hm2);(2)low and medium erodible soils were main soil types in Guizhou Province, and the whole province was with high soil erodibility K values and high potential soil erosion risks;(3)the spatial difference of K value distribution in the whole province was large, which gradually increases from west to east, showing a change trend: east Guizhou>Central Guizhou>west Guizhou, and a change trend: south of northern Guizhou>central Guizhou>north of northern Guizhou>south Guizhou in the north-south direction;(4)the erodibility K values of soils formed by various soil forming parent materials were between 0.028 4~0.046 8 t·hm2·h/(MJ·mm·hm2); the K value of soil formed by shale development is large(except for yellow brown soil), and the K value of soil formed by sandstone development was small;(5)with the increase of altitude, the soil erodibility value generally showed a downward trend;(6)land use mode had a significant impact on K value, and the soil erodibility K value deceased in the order: paddy field>dry land>grassland>shrub>forestland. The results show the spatial distribution characteristics and main influencing factors of soil erodibility K values in Guizhou Province, which can provide reference for soil loss prediction and soil and water conservation survey in Guizhou Province.