کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2413772 1552050 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon and nitrogen leaching under high and low phosphate fertility pasture with increasing nitrogen inputs
ترجمه فارسی عنوان
اشباع کربن و نیتروژن با توجه به افزایش میزان نیتروژن موجود در مرتع پرورش فسفات بالا و پایین
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
چکیده انگلیسی


• Soil with high phosphorus inputs had greater leaching of dissolved organic carbon.
• Dissolved organic carbon leaching also increased with increasing nitrogen inputs.
• Soil carbon stocks decreased with phosphorus inputs.

Intensive pastoral land use is associated with increased use of phosphate (P) and nitrogen (N) to enhance food and fibre production, but the interaction of N and P, particularly on carbon (C) storage, is not well understood. Our objectives were to determine the quantity and forms of C and N leached and also the changes in soil stocks in association with progressively increasing urea additions in two similar soils with high and low phosphate (P) fertility. A pasture cut-and-carry lysimeter experiment was established in the Waikato region of New Zealand, using soils from sheep grazed farmlets with a P management history of either no P or high P additions. Treatments imposed were a continuation of no P and high P (31.5 kg ha−1 y−1) inputs in combination with 0, 100, 200, 400 kg urea–N ha−1 y−1 in 50 kg split dressings or a single spring application of 400 kg N ha−1 y−1 of bovine urine. The high P soil had greater dissolved organic carbon (DOC) leaching, and DOC leaching in both soils increased with increasing urea inputs. Soil C decreased in the high P soil with N inputs, although there was no correlation between the rate of N addition and C loss. Urea addition led to increased N leaching in both soils, but was reduced in the high P soil compared with the no P soil. Greater herbage production may have utilised more dissolved N in the high P than in the no P soils, which led to less N available for leaching in the high P soil. Urine additions also led to greater C and N leaching in both the no P and high P soils.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Agriculture, Ecosystems & Environment - Volume 202, 1 April 2015, Pages 139–147
نویسندگان
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