Changes in Soil Organic Carbon, Nitrogen and Phosphorus in Modified and Native Rangeland Communities (Case study: Sisab Rangelands, Bojnord)
الموضوعات :Ali Asghar Naghipour Borj 1 , Maryam Haidarian Aghakhani 2 , Masoud Nasri 3 , Hadi Radnezhad 4
1 - Young Researchers Club, Ardestan Branch, Islamic Azad University, Ardestan
2 - Range Management. Faculty of Natural Resource & Marine Sciences, Tarbiat Modares University,
3 - CScientific Member of Islamic Azad University, Ardestan Branch,
4 - Department of Environmental Science, Faculty of Agriculture and Resource, Khorasgan (Esfahan) Branch,
Islamic Azad University, Esahan
الکلمات المفتاحية: Modified Rangeland, Native Rangeland, Kochia prostrata, Perennial grasses, and Soil properties,
ملخص المقالة :
Converting the native rangelands to simplified agronomic communities causessome changes in soil carbon, nitrogen and phosphorus. Establishing of perennial plantcommunities on formerly cultivated rangelands is expected to stabilize soil properties andincrease the amount of C, N, P stored in rangeland soils, but there is little information on whatplant communities are the most effective for improvement of soil C, N, P reserves. Thepurpose of this study was to compare soil C, N, and P pools in ungrazed native rangelandswith plant community of Festuca-Centurea with those ungrazed pastures established bysowing non-native perennial grasses (Agropyron elongatum and Agropyron desertorum),shrubs (Kochia prostrata), and wheat cultivation in continuous dry land farming system.Study site was located in Sisab Research Station in North Khorasan Province, Iran. Theresults showed that the total C, N and P contents in the soils under modified plantcommunities were less than that for native rangeland. Soils under A. elongatum, A.desertorum and K. prostrata tended to have higher values for total C, N and P than soilscultivated annually in wheat-fallow systems. The total C and N content of soils under K.prostrata were near as native rangeland which suggests that K. prostrata can increase the soilC and N contents much more rapidly than the other perennial communities.
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