NDLI: Effects of land use on $^{15}$N natural abundance of soils in Ethiopian highlands

Content Provider	Springer Nature Link
Author	Eshetu, Zewdu Högberg, Peter
Copyright Year	2000
Abstract	We used the natural abundance of $^{15}$N in soils in forests, pastures and cultivated lands in the Menagesha and Wendo-Genet areas of Ethiopia to make inferences about the N cycles in these ecosystems. Since we have described the history of these sites based on variations in $^{13}$C natural abundance, patterns of δ$^{15}$N and δ$^{13}$C values were compared to determine if shifts of $^{15}$N correlate with shifts of vegetation. At Menagesha, a > 500-yr-old planted forest, we found δ$^{15}$N values from −8.8 to +3.5‰ in litter, from −3.5 to +4.5‰ in 0–10 cm soil layer, and from −1.5 to +6.8‰ at >20 cm soil depth. The low δ$^{15}$N in litter and surface mineral soils suggests that a closed N cycle has operated for a long time. At this site, the low δ$^{13}$C of the surface horizon and the high δ$^{13}$C of the lower soil horizons is clear evidence of a long phase of C$_{4}$ grass dominance or cultivation of C$_{4}$ crops before the establishment of the forest >500 years ago. In contrast, at Wendo-Genet, high δ$^{13}$C of soils reveals that most of the land has been uncovered by forests until recently. Soil δ$^{15}$N was high throughout (3.4–9.8‰), and there were no major differences between forested, cultivated and pasture soils in δ$^{15}$N values of surface mineral soils. The high δ$^{15}$N values suggest that open N cycles operate in the Wendo-Genet area. From the points of view of soil fertility management, it is interesting that tall forest ecosystems with relatively closed N cycling could be established on the fairly steep slopes at Menagesha after a long period of grass vegetation cover or cultivation.
Starting Page	109
Ending Page	117
Page Count	9
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	222
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ecology Plant Sciences Plant Physiology Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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