The Journal "Agriculture and Forestry"
Časopis "Poljoprivreda i šumarstvo"
- Since 1955 -
Year 2019, Volume 65 Issue 2 (30.06.2019)
| Year : | 2019 |
| Volume : | 65 |
| Issue : | 2 (30.06.2019) |
| Authors : | Ramyar ALIRAMAYEE, Abdulvahed KHALEDI DARVISHAN, Mahmood ARABKHEDRI |
| Title : | INVESTIGATING THE HYDROLOGICAL RESPONSE AND NUTRIENT LOSS IN RAINFED LANDS IN NORTHEAST OF IRAN USING RAINFALL SIMULATOR |
| Abstract : | Topsoil is the richest part in terms of the amount of organic matter and nutrients. Therefore, its lost is more harmful compared to the subsoil. During the erosion process, soil nutrients are either lost as dissolved or absorbed to the soil particles. The present study was aimed to investigate the effects of rainfall intensity and slope gradient on infiltration, runoff, soil and nutrients (N, P, K) loss in rainfed lands of Pishkamar region, NE of Iran. To achieve the study purposes, four rainfall intensities of 33, 64, 80 and 110 mm h-1 were simulated using Kamphorst rainfall simulator in three slope gradients of 6, 12 and 25%. Two slope aspects of north and south were also considered for the slope gradient of 25%. The results showed that the effects of rainfall intensity and slope gradient on infiltration and runoff were significant, while the effect of slope aspect (north and south) was not. Taking into account the linear trend, the plot hydrological response threshold of sediment concentration was about 50 mm h-1 of rainfall intensity and 9% of slope. In the case of total soil loss, however, higher thresholds were obtained for rainfall intensities (about 72 mm h-1) and slope gradients (about 18%). The effect of rainfall intensity and slope gradient on soil loss were significant individually, but no interaction was observed among study factors. The results of nutrient losses showed considerable loss for Potassium in the runoff and Phosphorus and Potassium in the sediment. |
| For citation : | Aliramayee, R., Khaledi Darvishan, A., Arabkhedri, M. (2019): Investigating the hydrological response and nutrient loss in rainfed lands in northeast of iran using rainfall simulator. Agriculture and Forestry, 65 (2): 99-112. DOI: 10.17707/AgricultForest.65.2.08 |
| Keywords : | Average infiltration rate, Average runoff coefficient, Soil and sediment granulometry, Soil erosion, Soil fertility |
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