INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS

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VAEZI ALIREZA; BAYAT ZAHRA; FOROUMADI MAJID

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Journal: JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION Year:2018 | Volume:7 | Issue:4 Page(s): 25-38

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Title

INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS

Author(s)

VAEZI ALIREZA | BAYAT ZAHRA | FOROUMADI MAJID | Issue Writer Certificate

Keywords

HILLSLOPE EROSIONQ2

SLOPE GRADIENTQ2

SOIL DEGRADATIONQ2

VEGETATION COVERQ1

Abstract

Surface erosion is a one of the major factors of SOIL DEGRADATION and gradual decline in soil productivity. Little studies have been done on the surface erosion indices in the semi-arid rangelands. Therefore, this study was conducted to quantify surface soil erosion indices using the land characteristics in a semi-arid region. Five southern hillslopes with different SLOPE GRADIENTs (9, 13, 17, 31 and 33%) which subjected to surface erosion were selected in Zanjan province. Soil samples were collected from two depths (0-5 and 5-15 cm) in four locations at a 2-m distance along the slope at two replications. A total of 80 soil samples were collected for analyzing particle size distribution. Soil surface erosion indices were determined using the proportion of particle diameter for given frequency in surface and sub-surface soils. Toward this, the proportion of particle diameter in the frequency of 40 (d401/d402), 50 (d501/d502), 60 (d601/d602) and 70 % (d701/d702) was computed. Additionally, proportions of mean weight diameter (MWDp1/MWDp2), geometric mean diameter (dg1/dg2) and geometric standard deviation (dg1/dg2) of surface and subsurface soils particles were determined. Based on the results, significant differences were found among the hillslopes in all soil surface erosion indices, whereas the differences for the locations along the hillslopes were not statistically significant. In the steep slopes, the frequency of fine particles (silt and clay) and organic matter content was very low in surface soil. Multiple linear regression analysis appeared a strong relationship between the MWDp1/MWDp2 and SLOPE GRADIENT (R2= 0.51, p< 0.001). This study revealed that the MWDp1/MWDp2 is the proper index to evaluate soil surface erosion in the semi-arid hillslopes.

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APA: Copy

VAEZI, ALIREZA, BAYAT, ZAHRA, & FOROUMADI, MAJID. (2018). INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, 7(4 ), 25-38. SID. https://sid.ir/paper/232102/en

Vancouver: Copy

VAEZI ALIREZA, BAYAT ZAHRA, FOROUMADI MAJID. INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS. JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION[Internet]. 2018;7(4 ):25-38. Available from: https://sid.ir/paper/232102/en

IEEE: Copy

ALIREZA VAEZI, ZAHRA BAYAT, and MAJID FOROUMADI, “INVESTIGATING INDICES OF SOIL SURFACE EROSION AND THEIR RELATIONS TO SLOPE CHARACTERISTICS IN SEMI-ARID RANGELANDS,” JOURNAL OF WATER AND SOIL RESOURCES CONSERVATION, vol. 7, no. 4 , pp. 25–38, 2018, [Online]. Available: https://sid.ir/paper/232102/en

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