کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6338855 1620369 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nonlinear response of nitric oxide emissions to a nitrogen application gradient: A case study during the wheat season in a Chinese rice-wheat rotation system
ترجمه فارسی عنوان
پاسخ غیرخطی انتشار اکسید نیتریک به شیوه کاربرد نیتروژن: مطالعه موردی در طول فصل گندم در یک سیستم چرخش برنج گندم چینی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی
The response of nitric oxide (NO) emissions to nitrogen (N) input in agricultural ecosystems is generally assumed to be linear, but the availability of inorganic soil N exceeding crop N demands may cause a threshold response of NO. We conducted a four-rotation field measurement with discrepant N fertilizer rates during the wheat season of the rice-wheat rotation in the Taihu Lake region in China to test the hypothesis. Across all years, a nonlinear model well characterized the response of cumulative NO emissions to N fertilizer rates. The direct emission factors of NO induced by fertilizer also increased nonlinearly with increasing N doses, with a mean of 1.06% (ranging from 0.54% to 1.49%). NO emissions were low (<1.81 kg N ha−1 yr−1) over the 0-180 kg N ha−1 fertilizer additions; above these additions, the increasing N rates resulted in substantial NO increases ranging from 73% to 245% but only elevated crop yields by 6%. The results suggested defining the N rate of 180 kg N ha−1 as a promising level for achieving decreased NO emissions without greatly affecting the economic return from grain yield.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 102, February 2015, Pages 200-208
نویسندگان
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