Nutrients export by rivers to the coastal waters of Africa: Past and future trends

被引：48

作者：

Yasin, Jemal Adem ^{[1
]}

Kroeze, Carolien ^{[1
,2
]}

Mayorga, Emilio ^{[3
]}

机构：

[1] Wageningen Univ, Environm Syst Anal Grp, NL-6700 AA Wageningen, Netherlands

[2] Open Univ, Sch Sci, Heerlen, Netherlands

[3] Univ Washington, Appl Phys Lab, Seattle, WA 98105 USA

来源：

GLOBAL BIOGEOCHEMICAL CYCLES | 2010年 / 24卷

关键词：

CABORA BASSA; NITROGEN; MARINE; POLLUTION; WORLD; EUTROPHICATION; MANAGEMENT; PHOSPHORUS; TRANSPORT; CARBON;

D O I：

10.1029/2009GB003568

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We analyze past and future trends in nitrogen (N), phosphorus (P), and carbon (C) export by rivers to the coastal waters of Africa as calculated by the Global Nutrient Export to WaterShed (NEWS) models for the period 1970-2050. Between 1970 and 2000 the total nutrient export by African rivers increased by 10-80%. For future years (2000-2050) we calculate an increase in the total loads of dissolved forms of N and P, but decreasing trends for dissolved organic C and particulate forms of N and P. There are large regions that deviate from these pan-African trends. We explore the regional patterns and the underlying processes, in particular for the Nile, Zaire, Niger, and Zambezi. In the future, anthropogenic sources may, in large parts of Africa, become larger contributors to riverine nutrient loads than natural sources.

引用

页数：14

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