Fig. 2.

Mexican ethnoagroforestry systems, integrating elements from forests (wild) and agricultural or domesticated components of biodiversity in the Tehuacan Valley. The image illustrate several agroforestry practices such as friges of vegetation, isolated trees, terraces, and barriers against strong wind. AFS of the Tehuacán Valley showed in this image represent different environments discussed in the text but cultivation of maize and beans are the main annual crops in all cases, changing the composition of the wild vegetation composing the system. a AFS with Polakia chichipe and Myrtllocactus schenckii in the arid zone studied, b Fringes of vegetation mainly composed with Agave salmiana in the arid zone studied, c AFS with patches of vegetation composed by Escontria chitilla, Myrtillocactus schenckii, Polaskia chchipe and P. chende in the arid zone studied; d Fringes of terraces in the sub-humid region studied; e combination of native and domesticated trees, crops and herbaceous species; f Example of the aspect of an Island of vegetation in a cleared cropland; g Terraces constructed with ground and plants, h Terraces with stones, i General aspect of the landscape of AFS associated to the river