A methodology based on territorial metabolism analysis to assess the multi-criteria sustainability of African village terroirs with contrasted crop-livestock systems

CONTEXT: Agricultural intensification to ensure food security and limit rural exodus is a major issue in subSaharan Africa. The potential of livestock farming to improve the sustainability of farming systems has been studied but rarely at the landscape level. However, because the herds move about in the landscape, thereby creating horizontal biomass and nutrient flows between plots and households, the landscape is the only level where all the interactions between the different components of the agroecosystem (animals, crops and trees) can be considered. OBJECTIVE: Our objective was to develop a methodology that uses territorial metabolism for multicriteria assessment of sustainability to compare contrasted livestock systems.METHODS: We compare two neighboring village terroirs in the former groundnut basin of Senegal. One village (Diohine), has kept a traditional extensive system based on fallow, free grazing and night corralling, while the other (Barry) uses a modern semi-intensive system based on livestock fattening in which the livestock is stall -fed with feed concentrate and crop residues. During the survey, village households were asked to describe their practices and to quantify biomass and nitrogen (N) flows to enable us to calculate sustainability indicators (productivity, balance, efficiency, dependency, profitability) at plot, household and village terroir levels.RESULTS AND CONCLUSIONS: At village terroir level, introducing livestock fattening increased the livestock stocking rate (0.96 TLU ha-1 in Diohine and 2.31 TLU ha-1 in Barry) and spreading of solid manure on crop fields (respectively 337 and 482 kgDM ha-1). Fattening livestock requires large imports of feed concentrate, 23.67 kgN ha-1 in Barry versus 3.39 kgN ha-1 in Diohine. The improved livestock productivity of fattening (+217 kgLW ha-1) produces higher financial returns (+432euro household-1 year-1) that enable the use of more mineral fertilizers (6.28 kgN ha-1 in Barry versus 1.09 kgN ha-1 in Diohine). The additional N inputs in Barry enable increased yields of the main staple crop (millet) (+101 kgDM ha-1). The population density of Barry village is +78% higher (320 capita km-2 in Barry versus 180 capita km-2 in Diohine). The village nitrogen balance (24.88 kgN ha-1 in Barry versus 8.51 kgN ha-1 in Diohine) and N use efficiencies (respectively 0.64 and 0.15) demonstrate that nutrient cycling and soil fertility management are more sustainable in Barry. SIGNIFICANCE: We propose a methodology to rebuild territorial metabolism from surveys. Territorial metabolism is used to calculate a set of multi-criteria sustainability indicators. This methodology will be particularly useful in sub-Saharan Africa where data on agricultural systems are lacking.

Automated summary

Agricultural intensification is important for food security and limiting rural exodus in sub-Saharan Africa. Livestock farming has the potential to improve the sustainability of farming systems, but landscape-level studies are rare. By considering the interactions between animals, crops, and trees, the landscape level is the only level where the impacts of livestock farming can be fully understood. This study developed a methodology to compare different livestock systems based on territorial metabolism and sustainability indicators.