NDLI: Symbiotic nitrogen fixation in eight Acacia senegal provenances in dryland clays of the Blue Nile Sudan estimated by the $^{15}$N natural abundance method

Content Provider	Springer Nature Link
Author	Raddad, El Amin Yousif Salih, Ahmed Ali Fadl, Mohamed Ahmed El Kaarakka, Vesa Luukkanen, Olavi
Copyright Year	2005
Abstract	The symbiotic biological N$_{2}$fixation by Acacia senegal was estimated using the $^{15}$N natural abundance (δ $^{15}$N) procedure on eight provenances collected from different environments and soil types grown in a clay soil in the Blue Nile region, Sudan. Balanites aegyptiaca (a non-legume) was used as a non-N$_{2}$-fixing reference plant to allow $^{15}$N-based estimates of the proportion of the Acacia N derived from atmospheric N$_{2}$ (N$_{dfa}$) to be calculated. Results show variation in leaf δ $^{15}$N between A. senegal and the reference plant and among years. The relative δ $^{15}$N values (‰) were higher in B. aegyptiaca than in the N$_{2}$-fixing acacia provenances. Provenances originally collected from clay soils fixed little N in the first year, but the amount fixed increased as the trees aged. All provenances showed a decrease in δ $^{15}$N with age. The N$_{dfa}$ varied between 24% (Mazmoom provenance) and 61% (Rahad provenance) 4 years after planting. There was no significant difference in δ $^{15}$N between provenance groups based on soil type or rainfall at original growing site. The amount of N$_{dfa}$ increased significantly with age in all provenances. The above-ground contribution of fixed N to foliage growth in a 4-year-old A. senegal was highest in the Rahad sand–soil provenance (46.7 kg N ha$^{−1}$) and lowest in the Mazmoom clay-soil provenance (28.7 kg N ha$^{−1}$). Our study represents the first use of the δ $^{15}$N method for estimating the N input by A. senegal to the clay plain soils of the gum belt in the Sudan.
Starting Page	261
Ending Page	269
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	275
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acacia senegal agroforestry Balanites aegyptiaca gum belt N$_{dfa}$ N$_{2}$-fixing species reforestation Plant Sciences Ecology Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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