Alley Farming (The Tropical Agriculturalist) by B.T. Kang, A.N. Atta-Krah, L. Reynolds

By B.T. Kang, A.N. Atta-Krah, L. Reynolds

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1997. Freshwater ecosystem services. C. Daily, pp. 195–214. Washington, DC, Island Press. A. Mooney, editors. 1994. Biodiversity and Ecosystem Function (Ecological Studies, Vol. 99). Berlin, Springer-Verlag. Secretariat of the Convention on Biological Diversity. 2001. Handbook on the Convention on Biological Diversity. London and Sterling, VA, Earthscan Publications, Ltd. C. Austen, G. Boucher, C. A. M. King, I. D. Lambshead, and P. Snelgrove. 2000. Global change and biodiversity linkages across the sediment-water interface.

It also can result in fluxes of CO2 from fossil fuel combustion and N2O (Hall et al. 4). Biodiversity, or the variety of life forms, does not necessarily increase the sustainable delivery of ecosystem goods and services in agriculture. Nitrifiers and denitrifiers are responsible for huge losses of nitrogen from the soil system while leading to pollution of the groundwater with NO3 and the atmosphere with N2O (van Breemen et al. 2002). Many closely coupled natural systems operate essentially without these organisms in that they have an NH4-N nutritional system (Coleman & Crossley 1996).

Qxd 10/6/04 11:35 AM Page 33 2. Sustainable Delivery of Goods and Services Provided by Soil Biota | 33 exceptions require careful management. Non-tillage agriculture, when used with certain soils, increases the incidence of plant diseases. It can also lead to wet cold soils that delay planting. Increased cropping complexity and cover crops can have significant advantages in many agroecosystems, especially where the degree of mechanization is relatively low. On some soils, however, the moisture used by the cover crop results in lower crop yields and if not properly managed some cover crops can compete with the primary crop and act as weeds (Locke et al.

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