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Evapotranspiration in a Prairie Ecosystem

Effects of Grazing by Cattle

Dep. of Agron., 2004 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506

View larger version (30K): [in a new window]   Fig. 1. Conceptual model illustrating the effect of grazing on evapotranspiration (ET)

View larger version (28K): [in a new window]   Fig. 2. Seasonal patterns in (a) green leaf area index (LAI), (b) aboveground biomass production, (c) intercepted photosynthetically active radiation (PAR), and (d) and albedo on grazed (GR) and ungrazed (UGR) prairie sites. Vertical bars indicate ±1 SE (LAI and biomass: n = 4; intercepted PAR and albedo: n = 6). In some cases, error bars are smaller than symbols. Measurements of intercepted PAR and albedo were taken near midday. Data points are connected with lines to aid in interpreting the graphs and are not meant to represent values between observations

View larger version (25K): [in a new window]   Fig. 3. Seasonal patterns of daytime soil temperature (avg. between 0800 and 1730 CST) at 0.05 m on grazed (GR) and ungrazed (UGR) prairie sites. Data are presented in 5-d averages to show seasonal trends

View larger version (31K): [in a new window]   Fig. 4. Seasonal patterns in (a) net radiation (Rn), (b) heat flux into the soil (G), (c) latent heat flux into the atmosphere (LE), and (d) sensible heat flux into the atmosphere (H) from grazed (GR) and ungrazed (UGR) sites. Data are presented in 5-d averages to show seasonal trends. The scale of the y-axis is different for each figure

View larger version (27K): [in a new window]   Fig. 5. Seasonal patterns in available energy at the surfaces (Rn - G) of grazed (GR) and ungrazed (UGR) prairie sites. Data are presented in 5-d averages to show seasonal trends

View larger version (24K): [in a new window]   Fig. 6. Seasonal patterns in the Bowen ratio on grazed (GR) and ungrazed (UGR) prairie sites. Data are presented in 5-d averages to show seasonal trends

View larger version (34K): [in a new window]   Fig. 7. Seasonal patterns in volumetric soil water content (v) at 0.05-, 0.10-, and 0.30-m depths for grazed (GR) and ungrazed (UGR) prairie sites. Data are presented in 5-d averages

View larger version (39K): [in a new window]   Fig. 8. Seasonal patterns in (a) daytime evapotranspiration (ET) when net radiation was positive and (b) in volumetric soil water content (v) for the 0- to 0.30-m profile and precipitation from grazed (GR) and ungrazed (UGR) prairie sites. Data are presented in 5-d averages to show seasonal trends