title: Seasonal dynamics and age of stemwood nonstructural carbohydrates in temperate forest trees.
abstract: Nonstructural carbohydrate reserves support tree metabolism and growth when current photosynthates are insufficient, offering resilience in times of stress. We monitored stemwood nonstructural carbohydrate (starch and sugars) concentrations of the dominant tree species at three sites in the northeastern United States. We estimated the mean age of the starch and sugars in a subset of trees using the radiocarbon ((14) C) bomb spike. With these data, we then tested different carbon (C) allocation schemes in a process-based model of forest C cycling. We found that the nonstructural carbohydrates are both highly dynamic and about a decade old. Seasonal dynamics in starch (two to four times higher in the growing season, lower in the dormant season) mirrored those of sugars. Radiocarbon-based estimates indicated that the mean age of the starch and sugars in red maple (Acer rubrum) was 7-14 yr. A two-pool (fast and slow cycling reserves) model structure gave reasonable estimates of the size and mean residence time of the total NSC pool, and greatly improved model predictions of interannual variability in woody biomass increment, compared with zero- or one-pool structures used in the majority of existing models. This highlights the importance of nonstructural carbohydrates in the context of forest ecosystem carbon cycling.
authors.affiliation: Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA.
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Richardson
authors.affiliation: National Center for Ecological Analysis and Synthesis, Santa Barbara, CA, 93101, USA.
authors.forename: Mariah S
authors.initials: MS
authors.lastname: Carbone
authors.affiliation: Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, 02138, USA.
authors.forename: Trevor F
authors.initials: TF
authors.lastname: Keenan
authors.affiliation: Department of Earth System Science, University of California, Irvine, CA, 92697, USA.
authors.forename: Claudia I
authors.initials: CI
authors.lastname: Czimczik
authors.affiliation: USDA Forest Service, Northern Research Station, Durham, NH, 03824, USA.
authors.forename: David Y
authors.initials: DY
authors.lastname: Hollinger
authors.affiliation: USDA Forest Service, Northern Research Station, Burlington, VT, 05403, USA.
authors.forename: Paula
authors.initials: P
authors.lastname: Murakami
authors.affiliation: USDA Forest Service, Northern Research Station, Burlington, VT, 05403, USA.
authors.forename: Paul G
authors.initials: PG
authors.lastname: Schaberg
authors.affiliation: Department of Earth System Science, University of California, Irvine, CA, 92697, USA.
authors.forename: Xiaomei
authors.initials: X
authors.lastname: Xu
mesh_terms: D050260:Carbohydrate Metabolism; D002241:Carbohydrates / Q000032:analysis; D008954:Models, Biological; D018547:Plant Stems / Q000254:growth & development / Q000502:physiology*; D012621:Seasons; D013045:Species Specificity; D013213:Starch / Q000378:metabolism; D013997:Time Factors; D014197:Trees / Q000254:growth & development / Q000378:metabolism / Q000502:physiology*; D014934:Wood / Q000254:growth & development / Q000378:metabolism
chemical_list: D002241:Carbohydrates; D013213:Starch