18 مرداد 1399
شهريار مهدوي

شهریار مهدوی

مرتبه علمی: دانشیار
نشانی: ملایر- دانشگاه ملایر- دانشکده کشاورزی- گروه علوم ومهندسی خاک
تحصیلات: دکترای تخصصی / خاکشناسی
تلفن: 0812355338
دانشکده: کشاورزی

مشخصات پژوهش

عنوان
Nitrogen, phosphorus and sulfur mineralization as affected by soil depth in rangeland ecosystems
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Kinetic  Mineralization  Nitrification  Ammonification  Rangeland
سال
2014
مجله Environmental Earth Sciences
پژوهشگران شهریار مهدوی

چکیده

The potential mineralization and immobilization of soil nitrogen (N), phosphorus (P) and sulfur (S) are relatively high in natural ecosystems. This study was conducted to investigate the changes in essential plant macronutrients; N, P, and S status in response to different soil depth in rangeland ecosystems in vitro. The net nutrient mineralization was measured during 90 days at different depths (0–15, 15–30, 30–45 and 45–60 cm), using kinetic models to estimate the release rate. The net ammonification and mineralization of P and S were described using parabolic diffusion equation, while the power function equation was used to describe the net nitrification. The results indicated that the amount of released ammonium (NH4 ?) decreased with time and depth and the rates of net ammonification were negative in all samples. Conversely, nitrification increased with time and depth and the rates were all positive. The net mineralization for both P and S reduced with time. The concentration of mineralized SO4 2- increased with depth like nitrate (NO3 -). Accumulation of SO4 2- and NO3 - in subsurface soils and NH4 ? and P at surface horizons can increase the potential of their loss by leaching or volatilization.