A better appreciation of the ecosystem and environmental services provided through agroforestry would lead to the development of rigorous environmental and economic assessments and eventually to modification of community tax structures and environmental legislation.
The ecology of highly managed agroforestry systems is becoming better understood although much remains to be done. Two recent texts on the ecology of agroforestry systems (Batish, Kohli, Jose, & Singh, 2008; Jose & Gordon, 2008) present up‐to‐date research results on ecological interactions, belowground ecological processes, resource allocation and partitioning, and the modeling of these in both tropical and temperate agroforestry systems.
Acknowledgments
We wish to sincerely thank and acknowledge and are indebted to R.K. Olson, M.M. Schoeneberger, and S.G. Aschmann for their contributions to parts of this chapter. We have reproduced verbatim or with slight modifications of their writings in the first edition of this chapter. Similarly, we are also indebted to Caron et al. (2008), as some portions in this chapter have been adapted from their publication.
References
1 Anderson, G. W., Moore, R. W. & Jenkins, P. J. (1988). The integration of pasture, livestock and widely‐spaced pine in south west Western Australia. Agroforestry Systems, 6, 195–211. https://doi.org/10.1007/BF02344759
2 Atzet, R., & Waring, R. H. (1970). Selective filtering of light by coniferous forests and minimum light energy requirements for regeneration. Canadian Journal of Botany, 48, 2163–2167. https://doi.org/10.1139/b70‐312
3 Axelrod, D. I. (1985). Rise of the grassland biome, central North America. The Botanical Review, 51, 163–201. https://doi.org/10.1007/BF02861083
4 Batish, D. R., Kohli, R. K., Jose, S., & Singh, H. P. (Eds.). 2008. Ecological basis of agroforestry. Boca Raton, FL: CRC Press.
5 Bell, S., & Morse, S. (2000). Sustainability indicators: Measuring the immeasurable. London: Earthscan.
6 Belsky, A. J. (1994). Influences of trees on savanna productivity: Tests of shade, nutrients, and tree–grass competition. Ecology, 75, 922–932. https://doi.org/10.2307/1939416
7 Bender, J. (1994). Future harvest. Lincoln, NE: University of Nebraska Press.
8 Bernhardt, K. J. (1994). Sustainable agriculture impact study. 1994 ACE Project annual report. Lincoln, NE: Department of Agricultural Economics, University of Nebraska.
9 Billings, W. D. (1969). Vegetational pattern near alpine timberline as affected by fire–snowdrift interactions. Vegetatio, 19, 192–207. https://doi.org/10.1007/BF00259010
10 Blank, J. L., Olson, R. K., & Vitousek, P. M. (1980). Nutrient uptake by a diverse spring ephemeral community. Oecologia, 47, 96–98. https://doi.org/10.1007/BF00541781
11 Bragg, W. K., Knapp, A. K., & Briggs, J. M. (1993). Comparative water relations of seedling and adult Quercus species during gallery forest expansion in tallgrass prairie. Forest Ecology and Management, 56, 29–41. https://doi.org/10.1016/0378‐1127(93)90101‐R
12 Brandle, J. R., & Finch, S. (1991). How windbreaks work (EC 91‐1763‐B). Lincoln, NE: University of Nebraska Extension.
13 Braun, E. L. (1967). Deciduous forests of eastern North America. New York: Hafner Publishing Co.
14 Brenner, A. J. (1996). Microclimatic modifications in agroforestry. In C. K. Ong & P. Huxley (Eds.), Tree–crop interactions: A physiological approach (pp. 159–187). Wallingford, U.K.: CAB International.
15 Campbell, C., Heck, W., Neher, D., Munster, M., & Hoag, D. (1995). Biophysical measurement of the sustainability of temperate agriculture. In M. Munasinghe and W. Shearer (Eds.), Defining and measuring sustainability: The biophysical foundations (pp. 251–276). New York: United Nations University.
16 Caron, L., Duchesne, L., Gordon, A. M., Khasa, D., Kort, J., Olivier, A., … Vezina, A. (2008). Agroforestry. In R. Doucet (Ed.), Manual of forestry for Quebec. Quebec City, QC, Canada: University of Laval.
17 Chirko, C. P., Gold, M. A., Nguyen, P. V., & Jiang, J. P. (1996). Influence of direction and distance from trees on wheat yield and photosynthetic photon flux density (Qp) in a Paulownia and wheat intercropping system. Forest Ecology and Management, 83, 171–180. https://doi.org/10.1016/0378‐1127(96)03721‐8
18 Church, D. C. (1984). Livestock feeds and feeding. Corvallis, OR: O&B Books.
19 Cionco, R. M. (1985). Modeling windfields and surface layer wind profiles over complex terrain and within vegetative canopies. In B. A. Hutchinson & B. B. Hicks (Eds.), The forest–atmosphere interaction (pp. 501–520. Boston: D. Reidel. https://doi.org/10.1007/978‐94‐009‐5305‐5_30
20 Coleman, B., Bruce, K., Chang, Q., Frey, L., Guo, S., Tarannum, M.S., … Thevathasan, N. (2018). Quantifying C stocks in high‐yield, short‐rotation woody crop production systems for forest and bioenergy values and CO2 emission reduction. The Forestry Chronicle, 94, 260–268. https://doi.org/10.5558/tfc2018‐039
21 Coleman, B., Martin, A., Thevathasan, N., Gordon, A., and Isaac, M. (2020). Leaf trait variation and decomposition in short‐rotation woody biomass crops under agroforestry management. Agriculture, Ecosystems & Environment, 298, 106971. https://doi.org/10.1016/j.agee.2020.106971.
22 Daubenmire, R. (1978). Plant geography. New York: Academic Press.
23 Davies, K. M., Jr. (1994). Some ecological aspects of northeastern American Indian agroforestry practices. Northern Nut Growers Association Annual Report, 85, 25–37.
24 Diaz‐Forestier, J., Gomez, M., & Montenegro, G. (2009). Nectar volume and floral entomofauna as a tool for the implementation of sustainable apicultural management plans in Quillaja saponaria Mol. Agroforestry Systems, 76, 149–162.
25 Dix, M. E., Johnson, R. J., Harrell, M. O., Case, R. M., Wright, R. J., Hodges, L., … Hubbard, K. G. (1995). Influences of trees on abundance of natural enemies of insect pests: A review. Agroforestry Systems, 29, 303–311. https://doi.org/10.1007/BF00704876
26 Dougherty, M. C. (2007). Nitrate, ammonium and Escherichia coli NAR levels in mixed tree intercrop and monocrop systems (Doctoral dissertation). Retrieved from the Atrium repository (http://atrium.lib.uoguelph.ca/xmlui/handle/10214/19663).
27 Duke, J. A. (1989). Ginseng: A concise handbook. Algonac, MI: Reference Publications.
28 Dupraz, C., Lawson, G. J., Lamersdorf, N., Papanastasis, V. P., Rosati, A., & Ruiz‐Mirazo, J. (2018). Temperate agroforestry: The European way. In A. M. Gordon, S. M. Newman, & B. R. W. Coleman (Ed.), Temperate agroforestry systems (2nd ed., pp. 98–152). Wallingford, U.K.: CAB International.
29 Eichenberger, M. D., & Parker, G. R. (1976). Goldenseal (Hydrastis canadensis L.) distribution, phenology and biomass in an oak–hickory forest. Ohio Journal of Science, 76, 204–210.
30 Evers, A. K., Bambrick, A., Lacombe, S., Dougherty, M. C., Peichl, M., Gordon, A. M., … Bradley, R. L. (2010). Potential greenhouse gas mitigation through temperate tree‐based intercropping systems. The Open Agriculture Journal, 4, 49–57.