A new way to account for the effect of source- sink spatial relationships in whole plant carbon allocation models

To improve source–sink relationship based carbon-allocation models, the basic proportional model was extended to account for a well-known effect of individual source to sink distances: among different sinks of similar characteristics, the more distant from the source, the lower the allocation coefficient. This was achieved through multiplication of the sink strength value by a coefficient that is proportional to a decreasing, simple function of distance, f; the power form was chosen for both simplicity and theoretical reasons. The resulting model was parameterized and evaluated on the empirical allocation matrix of the ECOPHYS model, after grouping together several individual, small sinks of similar nature and close location to remove any phyllotaxy-related bias. Both goodness of fit and predictive value were significantly improved compared with the basic proportional model (f = constant). The f-extended model yielded even better results if segments of different nature or age on the source to sink pathway...

[1]  J. Farrar.  Sink strength: What is it and how do we measure it? A summary , 1993 .

[2]  Ruth D. Yanai,et al.  Modeling changes in red spruce carbon balance and allocation in response to interacting ozone and nutrient stresses. , 1991, Tree physiology.

[3]  Y. L. Grossman,et al.  Maximum Vegetative Growth Potential and Seasonal Patterns of Resource Dynamics during Peach Growth , 1995 .

[4]  M. R. Thorpe,et al.  A Simple Mechanistic Model of Phloem Transport which Explains Sink Priority , 1993 .

[5]  Philippe de Reffye,et al.  A functional model of tree growth and tree architecture , 1997 .

[6]  B. Efron.  Estimating the Error Rate of a Prediction Rule: Improvement on Cross-Validation , 1983 .

[7]  Y. L. Grossman,et al.  PEACH: A simulation model of reproductive and vegetative growth in peach trees. , 1994, Tree physiology.

[8]  J. R. Donnelly.  Seasonal changes in photosynthate transport within elongating shoots of Populus grandidentata , 1974 .

[9]  Jari Perttunen,et al.  LIGNUM: A Tree Model Based on Simple Structural Units , 1996 .

[10]  N. Nelson,et al.  Distribution of [14C]‐labeled photosynthates within intensively cultured Populus clones during the establishment year , 1983 .

[11]  P. W. West.  Model of Above-ground Assimilate Partitioning and Growth of Individual Trees in Even-aged Forest Monoculture , 1993 .

[12]  J. Thornley,et al.  A Transport-resistance Model of Forest Growth and Partitioning , 1991 .

[13]  A Lacointe,et al.  Generalized Münch coupling between sugar and water fluxes for modelling carbon allocation as affected by water status. , 2002, Journal of Theoretical Biology.

[14]  Roderick C. Dewar,et al.  A Root-Shoot Partitioning Model Based on Carbon-Nitrogen-Water Interactions and Munch Phloem Flow , 1993 .

[15]  Roderick C. Dewar,et al.  Carbon Allocation in Trees: a Review of Concepts for Modelling , 1994 .

[16]  Andrew Paul Gutierrez,et al.  A demographic model of assimilation and allocation of carbon and nitrogen in grapevines , 1991 .

[17]  P. Hansen.  14C‐Studies on Apple Trees. II. Distribution of Photosynthates from Top and Base Leaves from Extension Shoots , 1967 .

[18]  A. Lacointe,et al.  Seasonal Variation of Photosynthetic Carbon Flow Rate into Young Walnut and its Partitioning among the Plant Organs and Functions , 1995 .

[19]  Hal O. Liechty,et al.  A process-based growth model for young red pine , 1994 .

[20]  G. Host,et al.  Simulating the growth response of aspen to elevated ozone: a mechanistic approach to scaling a leaf-level model of ozone effects on photosynthesis to a complex canopy architecture. , 2001, Environmental pollution.

[21]  André Lacointe,et al.  Carbon allocation among tree organs: A review of basic processes and representation in functional-structural tree models , 2000 .

[22]  F. I. Woodward,et al.  Calculation of Translocation Coefficients from Phloem Anatomy for use in Crop Models , 1995 .

[23]  P. Rangnekar,et al.  Foliar nutrition and growth in red pine: distribution of photoassimilated carbon in seedlings during bud expansion , 1972 .

[24]  E. Münch,et al.  Die stoffbewegungen in der Pflanze , 1931, Nature.

[25]  H. M. Rauscher,et al.  ECOPHYS: An ecophysiological growth process model for juvenile poplar. , 1990, Tree physiology.

[26]  C. Priestley,et al.  The Distribution of 14C-Labelled Assimilates in Young Apple Trees as Influenced by Doses of Supplementary Nitrogen I. Total 14C Radioactivity in Extracts , 1976 .

[27]  Loïc Pagès,et al.  A carbon balance model of peach tree growth and development for studying the pruning response. , 1998, Tree physiology.

[28]  R. Dickson,et al.  Carbon and nitrogen allocation in trees , 1989 .