Land cover changes along tropical highland agroforestry systems: call for an improved climate adaptation. [P8]

Matokeo Arbogast, Lyimo James, Lelong Camille, Majule Amos, Masao Catherine, Mathé Pierre-Etienne, Vaast Philippe, Williamson David. 2015. Land cover changes along tropical highland agroforestry systems: call for an improved climate adaptation. [P8]. In : Building tomorrow’s research agenda and bridging the science-policy gap. CIRAD, INRA, IRD, Agropolis International, Wageningen UR, CGIAR, UCDAVIS, FAO, Agreenium, GFAR. Montpellier : CIRAD, Résumé, 89. Climate-Smart Agriculture 2015 : Global Science Conference. 3, Montpellier, France, 16 Mars 2015/18 Mars 2015.

Résumé : Tropical highland ecosystem resources strongly depend on climate variability and associated water availability. This work aimed at better understanding the interactions between agro-forestry systems (cocoa and coffee) and livelihoods resulting in Land Use/Cover Changes (LUCCs) along the Rungwe tropical highlands in southern Tanzania. GIS- based analysis and remote sensing methods (World view II, Landsat Thematic Mapper and Enhanced Thematic Mapper+) were undertaken to detect and map changes among four main agro-ecosystems, namely food, cash crops, forest and irrigated agro-ecosystems. Image analysis validated with geo-coding surveys evidenced significant LUCCs since 1993 along with a ca. 3% area-per-decade increase in cocoa, a ca. 6% area-per-decade decrease in coffee, and a ca. 4 % area-per-decade decrease in natural forest cover. The latter was associated with a loss of natural species such as the fire and drought-resistant miombo trees, a critical issue under currently drier conditions. In addition, primary data collection, household questionnaire surveys and key informant interviews showed that market-driven factors of LUCCs were straightforward, as illustrated by the replacement of major agro-forestry systems and/or the emergence of valuable cash crops (e.g. potato) through time. LUCCs mainly impacted crops and vegetation diversity, also resulting in increased land fragmentation. In the absence of climate-smart resource management, the land cover competition between food and cash crops was stressed as a critical threat over livelihood security. Trends in cocoa, tea and new avocado agro-forestry systems developed at the expense of coffee must be further understood as a balance between climate trends, population growth, political influences and infrastructure development.

Classification Agris : K10 - Production forestière
F08 - Systèmes et modes de culture
U30 - Méthodes de recherche
P40 - Météorologie et climatologie

Auteurs et affiliations

• Matokeo Arbogast, Université de Dar es Salaam (TZA)
• Lyimo James, Université de Dar es Salaam (TZA)
• Lelong Camille, CIRAD-ES-UMR TETIS (FRA) ORCID: 0000-0002-4850-1010
• Majule Amos, Université de Dar es Salaam (TZA)
• Masao Catherine, Université de Dar es Salaam (TZA)
• Mathé Pierre-Etienne, CEREGE (FRA)
• Vaast Philippe, CIRAD-PERSYST-UMR Eco&Sols (KEN)
• Williamson David, ICRAF (KEN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/576400/)

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