Scientific and policy interest in the biological diversity of agriculture (agrobiodiversity) is expanding amid global socioeconomic and environmental changes and sustainability interests. The majority of global agrobiodiversity is produced in smallholder food-growing. We use meta-analyses in an integrated framework to examine the interactions of smallholder agrobiodiversity with: (1) livelihood processes, especially migration, including impacts on agrobiodiversity as well as the interconnected resource systems of soil, water, and uncultivated habitats; and (2) plant-soil ecological systems. We hypothesize these interactions depend on: (1) scope of livelihood diversification and type resource system; and (2) plant residues and above-/belowground component ecological specificity. Findings show: (1) livelihood diversification is linked to varied environmental factors that range from rampant degradation to enhancing sustainability; and (2) significant ecological coupling of aboveground and soil agrobiodiversity (AGSOBIO assemblages). The environmental impacts of livelihood interactions correspond to variation of diversification (migration, on-farm diversification) and resource system (i.e., agrobiodiversity per se, soil, water). Our findings also reveal mutually dependent interactions of aboveground and soil agrobiodiversity. Results identify livelihood diversification-induced reduction of environmental resource quality with lagged agrobiodiversity declines as a potentially major avenue of global change. Our contribution re-frames livelihood interactions to include both agrobiodiversity and ecological systems. We discuss this integrated social-environmental re-framing through the proposed spatial geographic schema of regional agri-food spaces with distinctive matrices of livelihood strategies and relations to biodiversity and resources. This re-framing can be used to integrate livelihood, agrobiodiversity, and ecological analysis and to guide policy and scientific approaches for sustainability in agriculture and food-growing.

We use an original geographic framework and insights from science, technology, and society studies and the geohumanities to investigate the development of global environmental knowledge in tropical mountains. Our analysis demonstrates the significant relationship between current agrobiodiversity and the elevation of mountain agroecosystems across multiple countries. We use the results of this general statistical model to support our focus on mountain agrobiodiversity. Regimes of the agrobiodiversity knowledge of scientists, government officials, travelers, and indigenous peoples, among others, interacting in mountain landscapes have varied significantly in denoting geographic remoteness. Knowledge representing pre-European mountain geography and diverse food plants in the tropical Andes highlighted their centrality to the Inca Empire (circa 1400–1532). The notion of semiremoteness, geographic valley–upland differentiation, and the similitude-and-difference knowledge mode characterized early Spanish imperial rule (1532–1770). Early modern accounts (1770–1900) amplified the remoteness of the Andes as they advanced global ecological sciences, knowledge standardization, and racial representations of indigenous people as degraded, with scant attention to Andean agriculture and food. Global agrobiodiversity knowledge increasingly drew on corresponding representations of mountain remoteness. Our integration of the biogeophysical–social sciences with the geohumanities reveals distinctive geographies of agrobiodiversity knowledge. Assumed remoteness of mountain agrobiodiversity is not inherent but rather is actively formed in relation to global societies and knowledge systems and is thus relational. Connectivity and claims to territorial and indigenous autonomy distinguish newly emergent characteristics of agrobiodiversity. The multifunctionality and political geography of agrobiodiversity are integral to current mountain environments, societies, and sustainability.

SUMMARY This research sought to link Andean soil knowledge and farmer categorization of soil fertility to soil science characterization of soils, and use these to understand the impacts of phosphorus (P) fertilization of legumes using rock phosphate and soluble P fertilizer in 17 smallholder-managed sites with varying soil properties. We found that farmer high/low categorization of soils corresponded to soil P fertility and distance from farmer dwellings. Measures of soil P fertility also were inversely related to mycorrhizal colonization of vetch roots and directly related to the potential for P release by legume residues (C:P ratio). However, particular soil properties (texture and calcium phosphate pools) were better in explaining the response of legume biological nitrogen fixation to P addition, with maximal impacts in low-clay soils and soils with low calcium phosphates, as assessed with a dilute HCl extraction. In these conducive contexts, legume BNF increased 67 and 150% for RP and TSP, respectively (p < 0.05), with similar increases in biomass P stocks that showed promise for soil regeneration. In low-P fields, added P increased potential P release from legume residues via lower C:P ratios (p < 0.05). Percent cover of soil increased from 35% in the control to 45 and 55% with RP and TSP (p < 0.05), which shows potential for reduced erosion risk under P fertilization of legumes. We discuss results with respect to the integration of local farmer knowledge systems with exogenous scientific knowledge.