Agroecology Knowledge Hub

Diversity: diversification is key to agroecological transitions to ensure food security and nutrition while conserving, protecting and enhancing natural resources

Agroecological systems are highly diverse. From a biological perspective, agroecological systems optimize the diversity of species and genetic resources in different ways. For example, agroforestry systems organize crops, shrubs, livestock and trees of different heights and shapes at different levels or strata, increasing vertical diversity. Intercropping combines complementary species to increase spatial diversity. Crop rotations, often including legumes, increase temporal diversity. Crop–livestock systems rely on the diversity of local breeds adapted to specific environments. In the aquatic world, traditional fish polyculture farming, Integrated Multi-Trophic Aquaculture (IMTA) or rotational crop-fish systems follow the same principles to maximising diversity.

Increasing biodiversity contributes to a range of production, socio-economic, nutrition and environmental benefits. By planning and managing diversity, agroecological approaches enhance the provisioning of ecosystem services, including pollination and soil health, upon which agricultural production depends. Diversification can increase productivity and resource-use efficiency by optimizing biomass and water harvesting.

Agroecological diversification also strengthens ecological and socio-economic resilience, including by creating new market opportunities. For example, crop and animal diversity reduces the risk of failure in the face of climate change. Mixed grazing by different species of ruminants reduces health risks from parasitism, while diverse local species or breeds have greater abilities to survive, produce and maintain reproduction levels in harsh environments. In turn, having a variety of income sources from differentiated and new markets, including diverse products, local food processing and agritourism, helps to stabilize household incomes.

Consuming a diverse range of cereals, pulses, fruits, vegetables and animal-source products contributes to improved nutritional outcomes. Moreover, the genetic diversity of different varieties, breeds and species is important in contributing macronutrients, micronutrients and other bioactive compounds to human diets. For example, in Micronesia, reintroducing an underutilized traditional variety of orange-fleshed banana with 50 times more beta-carotene than the widely available commercial white-fleshed banana proved instrumental in improving health and nutrition.

At the global level, three cereal crops provide close to 50 percent of all calories consumed, while the genetic diversity of crops, livestock, aquatic animals and trees continues to be rapidly lost. Agroecology can help reverse these trends by managing and conserving agro-biodiversity, and responding to the increasing demand for a diversity of products that are eco-friendly. One such example is ‘fish-friendly’ rice produced from irrigated, rainfed and deepwater rice ecosystems, which values the diversity of aquatic species and their importance for rural livelihoods.

Database

Rice-duck and rice-fish co-culture systems are a major production systems in rice paddy fields in Southern China. Studying methane and nitrous oxide emissions and their economic value from those ecosystems can provide a theoretical and practical basis for further development and utilization of such traditional techniques. Methane and nitrous oxide emissions...
China
Journal article
2009
Este documento, desde análisis históricos enmarcados en algunas teorías y desde el reconocimiento de la Agroecología como ciencia que debe asumir un rol mucho más protagónico en la definición de las futuras políticas de producción, pretende aportar elementos útiles para dicho debate. El mismo se estructura de la siguiente manera....
Paraguay
Working paper
2009
Since 2015, the Earth to Tables Legacies project has brought together a small group of food activists across big differences - youth/elders, rural/urban, Indigenous/settler, Canadian/Mexican for exchange around food justice, and food sovereignty. Conversations and food initiatives are filmed and culminated in a multimedia educational package that includes facilitator’s guides, resources,...
Project
2020
Agroecology Newsletter of July 2022
Newsletter
2022
In the next section, we analyze some ontological mismatches of the main sustainable transition frameworks and identify debates and gaps in current research. Instead of reinforcing the understanding of sustainability issues, we conclude that a hasty combination of frameworks without critical reflection on their ontologies generates theoretical inconsistencies and the...
Journal article
2018