عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TL48098
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
Nitrogen and carbon in alfalfa grass/hay production in the Central High Plains: Coupling of soil-plant-atmosphere exchange
نام عام مواد
[Thesis]
نام نخستين پديدآور
Brekke Lane Peterson
نام ساير پديدآوران
Norton, Urszule; Krall, James M.
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
University of Wyoming
تاریخ نشرو بخش و غیره
2014
مشخصات ظاهری
نام خاص و کميت اثر
131
يادداشت کلی
متن يادداشت
Committee members: Islam, M. Anowarul; Legg, David; Stahl, Peter D.
یادداشتهای مربوط به نشر، بخش و غیره
متن يادداشت
Place of publication: United States, Ann Arbor; ISBN=978-1-321-51573-2
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
نظم درجات
Plant Sciences
کسي که مدرک را اعطا کرده
University of Wyoming
امتياز متن
2014
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
Alfalfa (Medicago sativa L.)/perennial bunchgrass hay is grown on marginal soils in the Central High Plains. This region has recently been experiencing frequent droughts. Information on the effects of variation in precipitation on soil nitrogen (N) cycling, greenhouse gas (GHG) fluxes and hay productivity is limited and much needed to better understand the overall impact of the regional climate on dryland agroecosystem N and carbon (C) cycling. A 26-month experiment was conducted at the James C. Hageman Sustainable Agriculture Research and Extension Center. The site received 21% above normal (2011), 64% below normal (2012) and 30% below normal (2013) annual precipitation. Bi-weekly monitoring of GHG fluxes, soil inorganic N, dissolved organic N (DON) and soil moisture was performed in irrigated hay, dryland hay and native prairie. Results suggested that reduced precipitation increased water delivery to irrigated crops by 80%, which resulted in a decrease in cumulative nitrous oxide (N2O) fluxes from 58.2 mg season-1 in 2011 to 38.1 mg season-1 in 2012, CO2 flux remained at 94.7 kg season-1 in both years. In dryland hay, cumulative N2O declined from 88.3 mg season-1 in 2011 to 34.4 mg season-1 in 2012 while CO2 flux remained at 48.2 kg season-1 in both years. Soil labile N accumulated each year in all soils at the end of the growing season, except in dryland hay in fall 2012. Simulated precipitation experiment showed an increase in CO2 from 32.5mg m-2hr-1 to 42.9 mg m-2hr -1 and N2O from 29.0 µg m-2hr -1 to 74.3 µg m-2hr-1 in dryland hay. In comparison, native prairie had an increase in CO2 from 4.8 mg m-2hr-1 to 36.9 mg m-2hr -1 and in N2O from 6.7 µg m-2hr -1 to 23.1 µg m-2hr-1 in. Shoot N decreased to 3.1 g m-2 in dryland hay and to 8.5 g m-2in 2012. In conclusion, drought affects more availability of soil N, soil-atmosphere N exchanges and plant biomass N than agroecosystem C. With the current predictions of increasing weather variability in this region, more effort should be placed in increasing agroecosystem efficiency to withstand increasing variability in precipitation.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Agronomy; Soil sciences
اصطلاحهای موضوعی کنترل نشده
اصطلاح موضوعی
Biological sciences;Alfalfa;Carbon dioxide;Methane;Nitrous oxide;Plant biomass carbon;Plant biomass nitrogen
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
Cotnoir, Amy E.
نام شخص - ( مسئولیت معنوی درجه دوم )
مستند نام اشخاص تاييد نشده
Norton, Urszule; Krall, James M.
شناسه افزوده (تنالگان)
تقسيم فرعي
Plant Sciences
مستند نام تنالگان تاييد نشده
University of Wyoming
شماره دستیابی
شماره بازیابی
1652533543; 3673931
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
