Universität zu Köln

Khalifa, Muhammad ORCID: 0000-0002-3100-9353, Elagib, Nadir Ahmed, Ribbe, Lars and Schneider, Karl ORCID: 0000-0002-4381-2151 (2018). Spatio-temporal variations in climate, primary productivity and efficiency of water and carbon use of the land cover types in Sudan and Ethiopia. Sci. Total Environ., 624. S. 790 - 807. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1879-1026

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Abstract

The impact of climate variability on the Net Primary Productivity (NPP) of different land cover types and the reaction of NPP to drought conditions are still unclear, especially in Sub-Saharan Africa. This research utilizes public-domain data for the period 2000 through 2013 to analyze these aspects for several land cover types in Sudan and Ethiopia, as examples of data-scarce countries. Spatio-temporal variation in NPP, water use efficiency (WUE) and carbon use efficiency (CUE) for several land covers were correlated with variations in precipitation, temperature and drought at different time scales, i.e. 1, 3, 6 and 12 months using Standardized Precipitation Evapotranspiration Index (SPEI) datasets. WUE and CUE were estimated as the ratios of NPP to actual evapotranspiration and NPP to Gross Primary Productivity (GPP), respectively. Results of this study revealed that NPP, WUE and CUE of the different land cover types in Ethiopia have higher magnitudes than their counterparts in Sudan. Moreover, they exhibit higher sensitivity to drought and variation in precipitation. Whereas savannah represents the most sensitive land cover to drought, croplands and permanent wetlands are the least sensitive ones. The inter-annual variation in NPP, WUE and CUE in Ethiopia is likely to be driven by a drought of time scale of three months. No statistically significant correlation was found for Sudan between the inter-annual variations in these indicators with drought at any of the time scales considered in the study. Our findings are useful from the view point of both food security for a growing population and mitigation to climate change as discussed in the present study. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Khalifa, Muhammad UNSPECIFIED orcid.org/0000-0002-3100-9353 UNSPECIFIED Elagib, Nadir Ahmed UNSPECIFIED UNSPECIFIED UNSPECIFIED Ribbe, Lars UNSPECIFIED UNSPECIFIED UNSPECIFIED Schneider, Karl UNSPECIFIED orcid.org/0000-0002-4381-2151 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-186449
DOI:	10.1016/j.scitotenv.2017.12.090
Journal or Publication Title:	Sci. Total Environ.
Volume:	624
Page Range:	S. 790 - 807
Date:	2018
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1879-1026
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NET PRIMARY PRODUCTION; TERRESTRIAL ECOSYSTEMS; DROUGHT RISK; EVAPOTRANSPIRATION ALGORITHM; SEMIARID ECOSYSTEMS; AFRICA SYNTHESIS; MODIS DATA; CHINA; MODEL; RESPIRATION Multiple languages Environmental Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18644