David Tenenbaum
Professor
Dissolved organic carbon leaching flux in a mixed agriculture and forest watershed in Rwanda
Författare
Summary, in English
Study region: Rukarara River Watershed (RRW), Rwanda. Study focus: DOC leaching has important environmental consequences for both terrestrial and aquatic ecosystems. This paper measures leached dissolved organic carbon (LDOC) and the factors controlling its variation in the RRW, a mixed agriculture and forest watershed in Rwanda. The study describes the relationship of LDOC with land use/land cover (LULC), soil properties, rainfall characteristics, and stream DOC using linear regression and linear mixed effects models. New hydrological insights: The annual LDOC flux from topsoil to deeper soil horizons was 13.62 tonnes of carbon for the study area. This annual LDOC flux represents approximately 2% of the net primary productivity and 0.02% of the soil carbon stock. The plantation forest and natural forest sites showed higher LDOC fluxes than other LULC classes. Soil TOC, TN, rainfall intensity and amount positively affected LDOC flux (7 ≤ R2 ≤ 30%) in the RRW. Cation exchange capacity, runoff, and rainfall storage negatively affected the RRW (7 ≤ R2 ≤ 23%). LDOC flux explained 14% of the variation of stream DOC in the RRW. Our results imply that, under ongoing climate and LULC changes, an increase of the proportion of plantation forest and rainfall intensity throughout the watershed will increase LDOC flux, and will have a weak positive effect on stream DOC.
Avdelning/ar
- Institutionen för naturgeografi och ekosystemvetenskap
- Centrum för Mellanösternstudier (CMES)
- BECC: Biodiversity and Ecosystem services in a Changing Climate
Publiceringsår
2019
Språk
Engelska
Publikation/Tidskrift/Serie
Journal of Hydrology: Regional Studies
Volym
26
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Oceanography, Hydrology, Water Resources
Nyckelord
- Dissolved organic carbon
- Land cover
- Leaching
- Linear models
- Rainfall characteristics
- Soil properties
- Watershed
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 2214-5818