ASSESSING THE EFFECTS OF EROSION ON LONG-TERM SOIL PRODUCTIVITY POTENTIAL IN KOHIN WATERSHED, GHAZVIN PROVINCE (SHORT TECHNICAL REPORT)

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GHAFARI GOOSHEH H.; GORJI M.

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Journal: Journal of Soil Management and Sustainable Production Year:2015 | Volume:5 | Issue:3 Page(s): 261-266

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Title

ASSESSING THE EFFECTS OF EROSION ON LONG-TERM SOIL PRODUCTIVITY POTENTIAL IN KOHIN WATERSHED, GHAZVIN PROVINCE (SHORT TECHNICAL REPORT)

Author(s)

GHAFARI GOOSHEH H. | GORJI M. | Issue Writer Certificate

Keywords

PRODUCTIVITY INDEXQ2

SUSTAINABLE AGRICULTUREQ1

SOIL VULNERABILITYQ2

Abstract

Background and Objectives: Maintaining soil productivity is one of the key factors in SUSTAINABLE AGRICULTURE. Erosion often causes changes in soil physical, chemical and biological properties as well as reducing soil productivity over a long-term period of time. Therefore, determining soil erosion tolerance is necessary for SUSTAINABLE AGRICULTURE production. There are several methods to evaluate the effects of erosion on crop yield and soil productivity such as PRODUCTIVITY INDEX, which is one of the most common methods. PI model is a relatively simple model that needs limited variables. That is why it is widely used in areas where there are limited data.Materials and Methods: In this study, the long-term effects of erosion on soil productivity in the typical Kohin watershed were evaluated. For this purpose, four profiles were drilled and described in the area. Modified productivity model was used to evaluate soil productivity changes, resulting in long term effects of erosion. Productivity reduction rate of 5% over 100 years was considered as the threshold to determine soil loss tolerance, based on soil and climate conditions of the area. The average annual erosion rate was estimated using the cesium-137 method.Results: The results showed that the average annual erosion rate of Kohin watershed was 44 tons per hectare per year based on cesium-137 activity method in the last 50 years, equivalent to a loss of 7.3 mm of topsoil every year. Therefore, soil productivity reduces about 0.58 percent annually due to current erosion. Considering productivity reduction rate of 5% over 100 year as an acceptable threshold, soil loss tolerance of Kohin soil series was calculated about 4.7 tons per hectare per year.Conclusion: In order to sustain soil productivity and agricultural production up to 100 years, it is necessary to reduce the amount of erosion around 90 percent. Considering the sediment delivery ratio of 0.25, the average annual sediment load was obtained about 1.1 tons per hectare per year, which is acceptable in terms of environment. Both organic matter content and available water content had the highest impact on soil PRODUCTIVITY INDEX. Therefore, it is recommended to take appropriate management measures toward increasing soil organic matter in order to enhance soil productivity of Kohin series.

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APA: Copy

GHAFARI GOOSHEH, H., & GORJI, M.. (2015). ASSESSING THE EFFECTS OF EROSION ON LONG-TERM SOIL PRODUCTIVITY POTENTIAL IN KOHIN WATERSHED, GHAZVIN PROVINCE (SHORT TECHNICAL REPORT). ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, 5(3), 261-266. SID. https://sid.ir/paper/209808/en

Vancouver: Copy

GHAFARI GOOSHEH H., GORJI M.. ASSESSING THE EFFECTS OF EROSION ON LONG-TERM SOIL PRODUCTIVITY POTENTIAL IN KOHIN WATERSHED, GHAZVIN PROVINCE (SHORT TECHNICAL REPORT). ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION[Internet]. 2015;5(3):261-266. Available from: https://sid.ir/paper/209808/en

IEEE: Copy

H. GHAFARI GOOSHEH, and M. GORJI, “ASSESSING THE EFFECTS OF EROSION ON LONG-TERM SOIL PRODUCTIVITY POTENTIAL IN KOHIN WATERSHED, GHAZVIN PROVINCE (SHORT TECHNICAL REPORT),” ELECTRONIC JOURNAL OF SOIL MANAGEMENT AND SUSTAINABLE PRODUCTION, vol. 5, no. 3, pp. 261–266, 2015, [Online]. Available: https://sid.ir/paper/209808/en

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