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Published online 6 July 2006
Published in J Environ Qual 35:1396-1404 (2006)
DOI: 10.2134/jeq2005.0155
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Land Use on Soil Respiration

Conversion of Oak Woodlands to Vineyards

Eli A. Carlislea,*, Kerri L. Steenwertha,b and David R. Smarta

a Department of Viticulture & Enology, University of California, Davis, One Shields Avenue, Davis, CA 95616-8749
b present address: USDA/ARS, Crops Pathology and Genetics Unit, University of California, Davis, One Shields Avenue, Davis, CA 95616-8749


Figure 1
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  		Fig. 1. Bimonthly measurements of (a) soil gravimetric water content, (b) soil temperature, and (c) soil CO2 efflux. Points represent means (n = 6), and error bars indicate standard error. Soil moisture and temperature measurements were taken to a 20-cm depth.

 

Figure 2
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  		Fig. 2. Seasonal means and standard errors of the means of soil profile CO2 concentrations in oak woodland and vineyard soils. During the winter and spring some sites were so waterlogged as to prevent sample gas extraction. As a result winter and spring points are composed of n = 3–6 data points while summer and fall points are composed of n = 12 data points.

 

Figure 3
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  		Fig. 3. Seasonal means and standard errors of the means of soil profile CO2 {delta}13C values in oak woodland and vineyard soils. During the winter and spring some sites were so waterlogged as to prevent sample gas extraction. As a result, winter and spring points are composed of n = 3–6 data points while summer and fall points are composed of n = 12 data points.

 

Figure 4
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  		Fig. 4. Modeled diffusion coefficients for vineyard and oak woodland soils for two depths (0–6 and 6–12 cm) as calculated for different soil water contents.

 




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