Exclosure effect on the resources allocation in Trifolium repens and Trifolium pratense in the rangelands of Shoghal Dare, Namin, Ardabil province

Shafaey, Shahin and Ghorbani, Ardavan and Moameri, Mehdi and Ghavidel, Akbar and Zandi Esfahani, Ehsan (2019) Exclosure effect on the resources allocation in Trifolium repens and Trifolium pratense in the rangelands of Shoghal Dare, Namin, Ardabil province. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim:The aim of this research is investigate changes of resources allocation in aerial parts and roots of Trifolium repens and Trifolium pratense and their production contribution of total production in the inside and outside of exclosure in Shoghal Dare rangelands of Namin. Research method:This study was conducted frome may-july 2017. To do this study, in 6 site and in each site, 3 transect100 m with 50 m distance and perpendicular to slope was established. Along each transect, 10 plat (1×1 m2) were established with a distance of ten meters from each other. Then, density, production, stone and gravel,bare soil and ...is recorded. To measure the resources allocation in different organs of T. repens and T. pratense in addition before transects, in each site 3 transect 50m (randomly) was deployed. Then, along each transect, was selected 10 random points and in each point the nearest plant was selected. (in general 180 individuals of each species). In the next step, in each point all the aerial parts and roots of the selectedplants (inflorescence, stem, root) were clipped and length of root, stem and inflorescence, plant height and basal diameter were measured by ruler. After air drying in the lab root weight, stem weight, inflorescence weight, and total weight by digital scale were weighed. With possession the weighet of the aerial parts and roots of T. repens and T. pratense was determined the resource allocation in all their organs in outside and inside of exclosure. Findings: Results of the exclosure effect on functional factors showed the canopy of the herbs and total vegetation cover there was no significant difference in outside and inside of exclosure. But total production, herbs production and T. repens and T. pratense production has significant difference in outside and inside of exclosure. The results of the exclosure effect on functional factors T. repens showed root weight, inflorescence weight, total weight and reproductive effortthere were significant difference but other factors (root length, stem weight, inflorescence weight, plant height, number of inflorescence, basal diameter and canopy cover) of T. repens had no significant difference in outside and inside of exclosure. In addition, results showed exclosure effects on the all functional factors T. pratense had significant difference in outside and inside of exclosure. The results showed that soil lime percentage, saturation percentage, sand and sodium had no significant difference in outside and inside of exclosure. But other factors (Ec, pH, OC, nitrogen, phosphorus, potassium, clay, silt, calcium, magnesium and bicarbonate) has significant difference in outside and inside of exclosure Conclusion:The results of this study showed that the exclosure increased the vegetation cover and the total production of plants inside of the enclosure. Also, the resources allocation inside of the enclosure was more than outside of exclosure. Therefore, the rangeland exclosure, with regard to social conditions of the region, can be an appropriate management method to increase the quantity and quality of vegetation cover.

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