کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4571227 1629225 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitrogen Dynamics in Hydrological Flow Paths of a Small Tropical Pasture Catchment
ترجمه فارسی عنوان
دینامیک نیتروژن در مسیرهای جریان هیدرولوژیکی یک حوضچه کوچک حوضه ای
کلمات کلیدی
آمونیوم، مواد مغذی سطوح سطحی، نیترات، مسیرهای هیدرولوژیکی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


• Organic nitrogen dominated all hydrological flow paths.
• Surface runoff is not an important flow path for N movement.
• Pastures in the Atlantic Forest region are net sinks for N.

In this paper we report nitrogen (N) dynamics within hydrological flow paths of a small tropical pasture catchment within the Atlantic Rainforest region in Natividade da Serra, São Paulo State, Brazil. By collecting soil solution through 27 tension lysimeters, surface runoff through 9 plots, groundwater through one well and one stream over the course of a year, N species concentration and fluxes could be clarified. All hydrological flow paths were dominated by organic N (~ 60–85%). This finding is explained as a consequence of a drop of soil N cycling rates and N gaseous fluxes previously reported in the literature. Nitrogen input via bulk precipitation (~ 3.5 kg N ha− 1 year− 1) exceeded N hydrological output through stream water (~ 2 kg N ha− 1 year− 1). Similar findings have been described for pastures of the Brazilian Amazon Basin. If pastures like these are maintained without fertilization, catchments whose land use is old pastures may not be an important direct source of inorganic N for downstream regions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CATENA - Volume 127, April 2015, Pages 250–257
نویسندگان
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