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Regional nitrogen budget of the Lake Victoria Basin, East Africa: syntheses, uncertainties and perspectives

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  • Minghua Zhou
  • Patric Brandt
  • David Pelster
  • Mariana C Rufino
  • Timothy Robinson
  • Klaus Butterbach-Bahl
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Article number105009
<mark>Journal publication date</mark>13/10/2014
<mark>Journal</mark>Environmental Research Letters
Issue number10
Volume9
Number of pages10
Publication statusPublished
Original languageEnglish

Abstract

Using the net anthropogenic nitrogen input (NANI) approach we estimated the N budget for the Lake Victoria Basin in East Africa. The NANI of the basin ranged from 887 to 3008 kg N km−2 yr−1 (mean: 1827 kg N km−2 yr−1) for the period 1995–2000. The net nitrogen release at basin level is due primarily to livestock and human consumption of feed and foods, contributing between 69% and 85%. Atmospheric oxidized N deposition contributed approximately 14% to the NANI of the Lake Victoria Basin, while either synthetic N fertilizer imports or biological N fixations only contributed less than 6% to the regional NANI. Due to the low N imports of feed and food products (