NDLI: Carbon and nutrient fluxes and balances in Nuba Mountains homegardens, Sudan

Content Provider	Springer Nature Link
Author	Goenster, Sven Wiehle, Martin Gebauer, Jens Ali, Abdalla Mohamed Buerkert, Andreas
Copyright Year	2014
Abstract	Management intensification has raised concerns about the sustainability of homegardens in the Nuba Mountains, Sudan. This study aimed at assessing the sustainability of these agroecosystems following the approach of carbon (C) and nutrient balances. Three traditional (low input) and three intensified (high input) homegardens were selected for monitoring of relevant input and output fluxes of C, nitrogen (N), phosphorus (P) and potassium (K). The fluxes comprised those related to management activities (soil amendments, irrigation, and biomass removal) as well as estimates of biological N2 fixation, C fixation by photosynthesis, wet and dry deposition, gaseous emission, and leaching. Annual balances for C and nutrients amounted to −21 kg C ha−1, −70 kg N ha−1, 9 kg P ha−1 and −117 kg K ha−1 in high input homegardens and to −1,722 kg C ha−1, −167 kg N ha−1, −9 kg P ha−1 and −74 kg K ha−1 in low input homegardens. Photosynthesis C was the main C input flux with averaged of 7,047 and 5,610 kg C ha−1 a−1 in high and low input systems, respectively. Biological N2 fixation (17 kg N ha−1 a−1) was relevant only in low input systems. In both systems, the annual input of 77 kg K ha−1 through dust was highly significant and annual gaseous C losses of about 5,900 kg C ha−1 were the main C loss. In both garden types, the removal of biomass accounted for more than half of total nutrient exports of which one-third resulted from weeding and removal of plant residues and two-third from harvest. The observed negative nutrient balances may lead to a long-term decline of crop yields. Among other measures the reuse of C and nutrients in biomass removals during the cleaning of homegardens may allow to partially close C and nutrient cycles.
Starting Page	35
Ending Page	51
Page Count	17
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	100
Issue Number	1
e-ISSN	15730867
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-06-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gaseous emissions Horizontal fluxes Jubraka Leaching Soil pool Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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