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The role of Exclosure in the change of aggregate stability and soil structure of rangelands in Golestan province

Document Type : Research Paper

Authors

1 Assistant professor, Department of Range and Watershed Management, Faculty of Natural Resources, Urmia University, Urmia, Iran

2 Assistant Professor, Department of Soil Science and Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran

3 Assistant Professor, Department of Rangeland Management, Gorgan University of Agricultural Sciences and Natural Resources. Gorgan, Iran

4 Ph.D student in Rangeland Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

Abstract

Soil aggregate stability and soil structure considered as the key indicators of range soil health and counted as effective factors in soil erosion control. The present study was carried out to investigate the effect of exclosure on the stability of aggregates and soil structure in four areas of Golestan province including Chaharbagh, Incheboron, Gomishan and Maravetapeh. Soil sampling was carried out from two depths of 0-20 and 20-40 cm by digging profile in random-systematic method along transects in each of exclosure and adjacent sites of quadruple areas. Aggregates stability was measured by the method of wet sieving in the laboratory. The results were analyzed statistically using independent and paired samples t-test for exclosure sites and adjacent exclosure sites as well as two corresponding depths, respectively. In the most of studied sites, the aggregate stability values were higher in the surface soil than the deep soil.The results indicated that the effect of rangeland exclosure on morphological changes and soil status indicating positive role in development of soil structure in all studied areas, however, these results were statistically significant only in the Incheboron and Gommishan area in view point of soil aggregate stability. The highest value of soil stability was in the first depth (4.52 mm) of Gomishan exclosure site and the lowest one was in the second depth (1.15 mm) in Gomishan grazing site. The final result showed that regardless of positive role of exclosure in promoting the stability of aggregate, factors such as geographic position of rangeland, climate, vegetation type and grazing conditions as the associated factors affecting the stability of aggregate and soil structure should be considered.

Keywords

References
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Iranian Journal of Range and Desert Research
Volume 26, Issue 4
December 2019
Pages 904-917
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