Table 1.
Precipitation and carbon fluxes over the study period.
Figure 1.
Environmental variables over the study period.
Environmental variables measured at xeric (closed triangles, dashed lines), intermediate (open circles, dotted lines) and mesic (closed circles, solid lines) sites at the Jones Center from October 2008 to October 2011. Monthly means were calculated for: (a) photosynthetically active radiation (PAR), (b) air temperature (Tair), (c) volumetric water content of the soil (VWC), (d) vapor pressure deficit (VPD), and (e) windspeed. Monthly sums were calculated for (f) precipitation.
Figure 2.
Monthly NEE, GEE and Reco over the study period.
Table 2.
NEE, fuel consumption and net biome exchange (NBE) (tonnes ha−1) over the study period.
Figure 3.
Interactive effect of Windspeed*Site and PAR*Site on NEE.
Least square mean values of NEE at the xeric, intermediate and mesic sites over (a) a range of wind speeds, and (b) a range of PAR values. FCT 1 is the first 28 days following fire, FCT 2 and 3 are the next two 28 day periods, FCT 4 represents the next 140 days, and FCT 5 represents the next 224 days. To mitigate for autocorrelation PAR and NEE are 28 day means.
Table 3.
Type III tests of fixed effects for the models of NEE, Reco and GEE.
Figure 4.
Interactive effect of PAR*FCT on NEE and VPD*FCT on GEE.
Least square mean values by fire cycle time (FCT) (a) over a range of PAR for NEE, and (b) over a range of VPD for GEE. FCT 1 is the first 28 days following fire, FCT 2 and 3 are the next two 28 day periods, FCT 4 represents the next 140 days, and FCT 5 represents the next 224 days. To mitigate for autocorrelation PAR and NEE are 28 day means.
Figure 5.
Representative pre- and post-fire light response curves.
Representative light response curves pre- (left) and post-fire (right) in January 2009 (top) and March 2011 (bottom) at the xeric, intermediate and mesic sites (green, red and blue, respectively).
Figure 6.
Representative pre- and post-fire temperature response curves.
Representative nighttime temperature response curves pre- (left) and post-fire (right) in January 2009 (top) and March 2011 (bottom) at the xeric, intermediate and mesic sites (green, red and blue, respectively).
Figure 7.
WUE over a range of VPD values at the xeric, intermediate and mesic sites. WUE values were from the hours between 11∶00 and 15∶00 with PAR greater than 500 µmol m−2 s−1.
Table 4.
Type III tests of fixed effects for the models of WUE and ET.