Examining Dissipation of element (P,N) and organic matters duo to water erosion in theDarbe-Khazine watershed at Shoushtar city in Khuzestan province

Since, the human being put his foot on the soily earth, by consuming limited resources, begandestroying them. This destruction was negligible until the human population began to increaseexponentially due to technological advances and health and nature cannot to restore it. This researchcarried out with the aim of studying loss of most-consumed macronutrients (N, P) and organic carboncaused by badland erosion occurred in the Darb-e-Khazine basin from Shoushtar City. This basin islocated in the southwestern of Iran in province of Khuzestan, the most parts of the basin is situated inShoushtar city and its terminal part is located a geographic span to city of MasjedSoleiman andRamhormoz. Sampling was done randomly from 0-10 cm depth of soil in that basin. Some physicaland chemical soil parameters such as pH, electrical conductivity, bulk density, organic matter and theamount of three most-consumed macro-nutrients elements (N, P), organic carbon and soil texture onthe samples tested. The results were analyzed using statistical software (spss) and at 5% significancelevel, comparison was done. The result showed that there were statistically significant differences inthe amounts of sand, clay, silt, organic matter, nitrogen, potassium, phosphorus, bulk density andacidity, and no significant differences in soil texture and soil type that it is due to the inherentproperties of the bedrock in the area can be attributed. Based on these results, it was found that theerosion, specially, badland erosion that can be seen more widely than other forms of erosion has greatimpact in reducing the percentage of organic matter, nitrogen, phosphorus, potassium, and increasedthe percentage of clay and silt particles, sand, soil acidity than the loss in protected areas. Level oflosses in eroded macro in the Hektar equal to 490% of total nitrogen, phosphorus 106000 ppm,potassium 6340000 ppm, respectively. Thus, the steady decrease in vegetation, soil organic matter,soil structure degradation and loss of stability of soil aggregates, soil erosion index has increased.

کلیدواژه ها:

macro-nutrients ، loss ، erosion ، watershed