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First-Rotation Changes in Soil Carbon and Nitrogen in a Eucalyptus Plantation in Hawaii

^a Dep. of Forest, Rangeland, and Watershed Stewardship and Graduate Degree Program in Ecology, Colorado State Univ., Ft. Collins, CO 80523
^b Dep. of Biology and Center for Environmental Studies, Arizona State Univ., Tempe, AZ 85287
^c Rocky Mountain Res. Stn., 240 West Prospect, Fort Collins, CO 80526

View larger version (25K): [in a new window]   Fig. 1. Soil content of C (upper left), C derived from C4 plants (upper right), C derived from C3 plants (lower right), and N (lower left). Points are averages of 18 plots, with each plot as the average of three cores. The 30- to 45-cm depth was not sampled in Year 0. Soil C did not change across time, as the increase in C3–derived C was matched by the loss of C4–derived C. Soil N did not change.

View larger version (19K): [in a new window]   Fig. 2. The CO2 released in laboratory incubations showed declining rates across time (top graph; bars are standard errors), as well as declining 13C (the per mil difference between the carbon-13 content of the sample and the Pee Dee belemnite standard; middle graph), and proportion of CO2 derived from C4 sugarcane (bottom graph). The rate of CO2 release was not affected by N addition (either in the field or laboratory), but the rates were higher at 25°C (high temperature) than at 21.5°C (all others). The middle graph also shows the 13C for a nearby Eucalyptus plantation that was never cropped with sugarcane (providing a pure C3 signal), and a site that was currently in sugarcane land use (providing a C4 endpoint).

View larger version (18K): [in a new window]   Fig. 3. Cumulative loss of soil C during 3-mo incubations showed no effect of added N on the release of C from either C3– or C4–derived pools, and the release from both pools was increased at the higher temperature (25°C) relative to the other treatments (21.5°C). Bars with the same letter do not differ at P = 0.05 (error bars are standard errors).