Stand-Scale Correspondence in Empirical and Simulated Labile Carbohydrates in Loblolly Pine
Of particular interest, the simulated daily gross C balance indicated periods of carbon deficit during the growing season that lasted from 1 to 40 days. Simulated daily net C balance was met from labile C storage during these periods. Fertilized plots had similar time-period trends as the control plots, but exhibited a twofold increase in C assimilation and use. Simulated and empirical estimates of the labile carbohydrate pools displayed similar seasonal trends, although their correspondence depended on the time of year. Simulations indicated a winter/early spring “recharge” period; concentrations peaked at ∼50 and ∼60 mg C g biomass-1 in control and fertilized plots, respectively, in 1995. The overall correlation between predicted and empirical estimates was low to moderate (r = 0.51). The best agreement was with the empirical data from April through June as concentrations declined; however, predicted minimum concentrations (15 and 5 mg C g biomass-1 in control and fertilized plots, respectively) were lower, and obtained earlier in the year than the empirical data (∼20 mg C mg biomass-1). These analyses quantify the strong extent that loblolly pine exhibits a buffered capacity to balance the C budget when current photosynthesis occasionally cannot meet daily C requirements. Further development of our approach may lead to a tool for analyzing potential risks associated with intensive forest management. FOR. Sci. 47(1):60–68.
Keywords: Fertilization; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; labile carbohydrate; loblolly pine; natural resource management; natural resources; process modeling
Document Type: Miscellaneous
Affiliations: 1: Owner Terra Guild International, 602 West Emerald Ave, Mesa, AZ, 85210, Phone: (480) 964-8932 [email protected] 2: Project Leader USDA Forest Service, Southeastern Forest Experiment Station, RTP, NC, 27709, Phone: (919) 549-4000 [email protected] 3: Research Scientist USDA Forest Service, Southeastern Forest Experiment Station, RTP, NC, 27709, Phone: (919) 549-4044 [email protected] 4: Research Associate Department of Forestry, North Carolina State University, Box 8008 Raleigh, NC, 27695-8008, Phone: (919) 515-3500 [email protected] 5: Research Scientist USDA Forest Service, Southeastern Forest Experiment Station, RTP, NC, 27709, Phone: (919) 549-4000 [email protected]
Publication date: 2001-02-01
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