Example studies of determinants of land base changes involving forestland.

Table 1 lists examples of studies that have examined land base dynamics in the United States, where millions of acres of land shift uses each year (USDA NRCS 2001), reflecting billions of choices made by individuals, corporations, nongovernmental organizations, and governments.

Land Base Change	Approach	Studies	Data Bases
Deforestation	Econometric	Alig and Healy 1987, Alig and others 2004, Kline and Alig 2001, Hardie and others 2000	USDA NRCS 2001; FIA surveys
Afforestation	Econometric	Lee and others 1992, Kline and others 2002	USDA Forest Service tree planting reports
Forest fragmentation	Econometric and statistical	Butler and others 2004, Wear and others 2004, Alig and others 2005	National land cover data base
Forest parcelization	Statistical	Butler and Leatherberry 2004	National forest landowner survey
Structure additions toforests	Statistical	Hammer and others 2004, Radeloff and others 2005, Stewart and others 2003	USDC Census Bureau
Urban forest changes	Statistical	Nowak and Walton 2005	USDC Census Bureau

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