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    Towards ecosystem accounts for Rwanda: tracking 25 years of change in flows and potential supply of ecosystem services

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    Journal Article (5.987Mb)
    Date
    2019-12-09
    Author
    Bagstad, K.J.
    Ingram, J.C.
    Lange, G.
    Masozera, M.
    Ancona, Z.H.
    Bana, M.
    Kagabo, D.
    Musana, B.
    Nabahungu, N.L.
    Rukundo, E.
    Rutebuka, E.
    Polasky, S.
    Rugege, D.
    Uwera, C.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Rwanda, a small but rapidly developing central African nation, has undertaken development of natural capital accounts to better inform its economic development through the World Bank's Wealth Accounting and Valuation of Ecosystem Services (WAVES) Partnership. In this paper, we develop ecosystem service (ES) models to quantify ecosystem condition and physical supply components of ecosystem accounts in Rwanda from 1990 to 2015. We applied the InVEST carbon storage, sediment delivery ratio, nutrient delivery ratio, and annual and seasonal water yield models to map changes in potential ES supply nationwide. We also quantified flows of sediment, water and nutrients to 96 hydroelectric dam, irrigation dam and water treatment plant sites. Over a 25‐year period, we found declines in all ES, which were most strongly driven by conversion of forests to cropland. Declines were most pronounced from 1990 to 2000 and 2010 to 2015; ES were relatively stable from 2000 to 2010 (with the exception of nutrient exports to water bodies, which jumped most sharply from 2000 to 2010). From 2010 to 2015, over 42% of Rwanda's water‐use sites (representing 9% of the nation's hydroelectric generation capacity and 59% of its water treatment capacity) had upstream increases in sediment export and quick flow greater than the national average. Half of Rwanda's water treatment plants had upstream phosphorus exports greater than the national average. Our results quantify nation‐wide ES trends, their implications for key water‐dependent industries, and the importance of protected areas in safeguarding ES flows and potential supply in Rwanda. They also provide data that can be integrated with existing land, water and economic accounts for Rwanda, as well as a baseline to inform development strategies that better link economic and environmental goals.
    https://dx.doi.org/10.1002/pan3.10062
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6931
    IITA Authors ORCID
    Nsharwasi Nabahunguhttps://orcid.org/0000-0002-2104-3777
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1002/pan3.10062
    Research Themes
    Natural Resource Management
    IITA Subjects
    Aflatoxin; Agronomy; Natural Resource Management; Socioeconomy
    Agrovoc Terms
    Ecosystems; Accounting; Services; Agricultural Production; Rwanda; Ecosystem Services
    Regions
    Africa; East Africa
    Countries
    Rwanda
    Hubs
    Central Africa Hub
    Journals
    People and Nature
    Collections
    • Journal and Journal Articles4835
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