Fig. 2–2. Principles and benefits derived from the windbreak agroforestry practice.

      Through the introduction of trees and the interactions they generate, agroforestry can significantly contribute to desirable ecosystem level services. Overall this can result in more structurally diverse (both above and below ground) agroecosystems that are richer in plant and animal biodiversity and have improved system self‐maintenance and resistance to environmental stresses (Jose and Holzmueller, 2022; Udawatta et al., 2017; USDA, 2017). Based on these ecological principles, agroforestry practices can be an important tool to restore land use sustainability, overall ecosystem health, and be used to reclaim degraded lands. Thus, agroforestry is more than a set of practices; it is the incremental addition of trees to farming systems and farming landscapes, resulting in the generation and enhancement of desired ecological services considered vital for sustainable land use (Jordan et al., 2007; Geertsema et al., 2016; USDA, 2017).

      To be effective, agroforestry must follow a grassroots approach tailored to: i) the individual landowner’s special interests, problems, and needs (Rule et al., 2000); ii) the available productive niches; and iii) the local soil and climate conditions and existing and potential markets (Gold et al., 2004, 2013, 2018). This same approach also applies to community‐based land stewardship (Curtis et al., 1995; Garrity 2005; Schoeneberger et al., 2006). Thus, although we now recognize six categories of agroforestry practices for nomenclature purposes, these practices are not rigid. Rather, the application of agroforestry should be seen as a common‐sense approach tailored to local needs and conditions (Sobels et al., 2001; Rule et al., 2000; Rios‐Diaz et al., 2018). The result is an approach that is similar to whole farm planning in that the emphasis is on the design of a system for a given field, farm, or watershed rather than the promotion of a particular land use option (Gold et al., 2013, 2018).

      As found in the chapters within this volume, over the past decade, there has been rapid development of agroforestry science in support of agroforestry practices. Appropriate technologies, information, and tools have been developed to design agroforestry practices to achieve specific production and conservation objectives at the local level (Bentrup and Kellerman, 2004; Shelton et al., 2005; Gold et al., 2013, 2018; Wilson et al., 2018). Based on strong supporting data obtained from multiple studies accumulated at numerous sites over many years, agroforestry science is well on the way toward developing the principles (i.e., component interactions and ecosystem functions) that underlie these practices (Nair, 2007; Lovell et al., 2017; USDA, 2017; Munsell and Chamberlain, 2019).

      As a science‐based on interacting components within practices (i.e., combinations of trees, crops and livestock), agroforestry draws upon knowledge from many different disciplines. Beginning in 1990 and evolving rapidly in the past decade, a critical process‐level, science‐based approach to agroforestry research has gradually emerged. An understanding of component interactions is being assembled which will enable applications to be designed in a predictable manner. The bottom line for agroforestry is to be able to locally apply technologies that generate predictable and positive interactions, and optimize them for the benefit of the farmer and associated land resources, and for society as a whole. To achieve the bottom line, a fusion of top‐down and bottom‐up approaches are needed that are market‐focused and result in the development of robust social networks (Rule et al., 2000; Valdivia et al., 2022) at multiple social and spatial scales (i.e., landowner, community, state, region, and nation).

References