Arid
DOI10.1007/s10021-007-9092-1
Nutrient vectors and riparian processing: A review with special reference to African semiarid Savanna ecosystems
Jacobs, S. M.1,9; Bechtold, J. S.1; Biggs, H. C.2; Grimm, N. B.3; Lorentz, S.4; McClain, M. E.5; Naiman, R. J.1; Perakis, S. S.6; Pinay, G.7,10; Scholes, M. C.8
通讯作者Jacobs, S. M.
来源期刊ECOSYSTEMS
ISSN1432-9840
出版年2007
卷号10期号:8页码:1231-1249
英文摘要

This review article describes vectors for nitrogen and phosphorus delivery to riparian zones in semiarid African savannas, the processing of nutrients in the riparian zone and the effect of disturbance on these processes. Semiarid savannas exhibit sharp seasonality, complex hillslope hydrology and high spatial heterogeneity, all of which ultimately impact nutrient fluxes between riparian, upland and aquatic environments. Our review shows that strong environmental drivers such as fire and herbivory enhance nitrogen, phosphorus and sediment transport to lower slope positions by shaping vegetative patterns. These vectors differ significantly from other and and semiarid ecosystems, and from mesic ecosystems where the impact of fire and herbivory are less pronounced and less predictable. Also unique is the presence of sodic soils in certain hillslopes, which substantially alters hydrological flowpaths and may act as a trap where nitrogen is immobilized while sediment and phosphorus transport is enhanced. Nutrients and sediments are also deposited in the riparian zone during seasonal, intermittent floods while, during the dry season, subsurface movement of water from the stream into riparian soils and vegetation further enrich riparian zones with nutrients. As is found in mesic ecosystems, nutrients are immobilized in semiarid riparian corridors through microbial and plant uptake, whereas dissimilatory processes such as denitrification may be important where labile nitrogen and carbon are in adequate supply and physical conditions are suitable-such as in seeps, wallows created by animals, ephemeral wetlands and stream edges. Interaction between temporal hydrologic connectivity and spatial heterogeneity are disrupted by disturbances such as large floods and extended droughts, which may convert certain riparian patches from sinks to sources for nitrogen and phosphorus. In the face of increasing anthropogenic pressure, the scientific challenges are to provide a basic understanding of riparian biogeochemistry in semiarid African savannas to adequately address the temporal and spatial impact of disturbances, and to apply this knowledge to better regional land and water management. An integrated, multidisciplinary approach applied in protected as well as human-disturbed ecosystems in southern Africa is essential for underpinning a strong environmental basis for sustainable human-related expansion.


英文关键词riparian biogeochemistry nitrogen phosphorus semiarid landscapes fluvial disturbance South Africa
类型Review
语种英语
国家USA ; South Africa ; France ; England
收录类别SCI-E
WOS记录号WOS:000252089200001
WOS关键词YELLOWSTONE-NATIONAL-PARK ; DESERT STREAM ECOSYSTEM ; WESTERN UNITED-STATES ; SOIL ORGANIC-MATTER ; SOUTHERN NEW-MEXICO ; SONORAN DESERT ; TERRESTRIAL ECOSYSTEMS ; NITROGEN MINERALIZATION ; ECOLOGICAL CONSEQUENCES ; BIOGEOCHEMICAL CONTROLS
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构United States Geological Survey ; Arizona State University ; French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/154034
作者单位1.Univ Washington, Sch Aquat & Fishery Sci, Seattle, WA 98195 USA;
2.Kruger Natl Pk, Sci Serv, ZA-1350 Skukuza, South Africa;
3.Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA;
4.Univ KwaZulu Natal, Sch Bioresources Engn & Environm Hydrol, ZA-3209 Scottsville, South Africa;
5.Florida Int Univ, Dept Environm Studies, Miami, FL 33199 USA;
6.USGS Forest & Rangeland Ecosyst Sci Ctr, Corvallis, OR 97331 USA;
7.CNRS, Ctr Ecol Fonct & Evolut, F-34293 Montpellier 5, France;
8.Univ Witwatersrand, Sch Anim Plant & Environm Sci, ZA-2050 Wits, South Africa;
9.Univ Stellenbosch, Dept Conservat Ecol & Entomol, ZA-7602 Matieland, South Africa;
10.Univ Birmingham, GEES, Birmingham B15 2TT, W Midlands, England
推荐引用方式
GB/T 7714
Jacobs, S. M.,Bechtold, J. S.,Biggs, H. C.,et al. Nutrient vectors and riparian processing: A review with special reference to African semiarid Savanna ecosystems[J]. United States Geological Survey, Arizona State University, French National Research Institute for Sustainable Development,2007,10(8):1231-1249.
APA Jacobs, S. M..,Bechtold, J. S..,Biggs, H. C..,Grimm, N. B..,Lorentz, S..,...&Scholes, M. C..(2007).Nutrient vectors and riparian processing: A review with special reference to African semiarid Savanna ecosystems.ECOSYSTEMS,10(8),1231-1249.
MLA Jacobs, S. M.,et al."Nutrient vectors and riparian processing: A review with special reference to African semiarid Savanna ecosystems".ECOSYSTEMS 10.8(2007):1231-1249.
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