Assessment of the S-index using three models of the soil water retention curve in five different Land uses in south of Kerman

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Amiri Mijan F.; SHIRANI H.; ESFANDIARPOUR I.; BESALATPOUR A.A.; SHEKOFTEH H.

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Journal: Journal of Water and Soil Conservation Year:2019 | Volume:25 | Issue:6 Page(s): 87-103

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Title

Assessment of the S-index using three models of the soil water retention curve in five different Land uses in south of Kerman

Author(s)

Keywords

Brooks-Corey modelQ1

Grant-Groenevelt modelQ1

Land useQ2

S-indexQ3

Soil physical qualityQ1

Van Genuchten modelQ1

Abstract

Background and Objectives: One of the ways to express physical behavior of soil is to describe of the soil structure. Since Soil physical quality could not be measured directly, therefore, the special properties defined as indicators, are used to express the Soil physical quality. Of different indicators, including S-index is used to express the physical quality of the soil which is the slope of the soil water retention curve at inflection point. It seems that little research has been done on the effect of landuse on the S-index, therefore, the purpose of this study was to compare the results of S-index in three different soil water characteristic curve models (Van Genuchten, Brooks-Corey and Grant-Groenevelt models) in 5 different Land uses in Jiroft city. Materials and Methods: For this reason, 350 disturbed and 350 undisturbed soil samples from different landuse (citrus, palm, arable, forest and combinatory) were collected. Some of the physical and chemical features of the soil, including sand, silt and clay percentage, the electronic conductivity at saturation, Bulk Density, the percentage of the total porosity and the percentage of the Organic Matter were measured. Also, the amount of the soil moisture in suctions 0, 10, 30, 50, 100, 300, 500, 1000 and 1500 KPa was determined using pressure plates device. Results: The results showed that in the study region the best physical quality of the soil was seen in palm Land use. All landuses, except forest, had proper physical quality. High value of S index in citrus, palm and arable Land uses can indicate better soil management at the start of farming. In combinatory Land use, due to Simultaneous cropping of alfalfa and palm, alfalfa causes more organic matter to be returned to the soil and as a result, the soil structure improves, which is displayed at high value of S index. In general, The S index was higher in landuses where the soil had better structure or management operations were improved. Conclusion: In general, despite the slight differences in citrus, palm and cultivate landuses, palm landuse had a higher mean of S index. So that their values in Van Genuchten, Brooks-Corey and Grant-Groenevelt models were 0. 06, 0. 06 and 0. 04 respectively. The results of this study showed that the Van Genuchten model accuracy was better in estimating and evaluating the soil quality due to the greater distinction between the soils with close physical quality. Because the fitting of Soil water characteristic curve had a higher R2 (R2=0. 92). However, due to low differences with two other models, in particular the Brooks and Corey model (R2=0. 87), It seems that, a suitable model for assessing soil quality in different landuses varies. Therefore, it is imperative that this index and other indicators of Soil physical quality assessment in different climates are more explored.

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APA: Copy

Amiri Mijan, F., SHIRANI, H., ESFANDIARPOUR, I., BESALATPOUR, A.A., & SHEKOFTEH, H.. (2019). Assessment of the S-index using three models of the soil water retention curve in five different Land uses in south of Kerman. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(6 ), 87-103. SID. https://sid.ir/paper/156420/en

Vancouver: Copy

Amiri Mijan F., SHIRANI H., ESFANDIARPOUR I., BESALATPOUR A.A., SHEKOFTEH H.. Assessment of the S-index using three models of the soil water retention curve in five different Land uses in south of Kerman. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2019;25(6 ):87-103. Available from: https://sid.ir/paper/156420/en

IEEE: Copy

F. Amiri Mijan, H. SHIRANI, I. ESFANDIARPOUR, A.A. BESALATPOUR, and H. SHEKOFTEH, “Assessment of the S-index using three models of the soil water retention curve in five different Land uses in south of Kerman,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 6 , pp. 87–103, 2019, [Online]. Available: https://sid.ir/paper/156420/en

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