Modelling of respiration: effect of variation in respiration on plant growth in two Carex species

T. Hirose, H. Lambers, H. Konings, A. Van Der Werf

Research output: Contribution to journalArticle

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Abstract

A growth model of Carex diandra and Carex acutiformis was constructed assuming 1) that the gross photosynthesis and dark respiration of the shoot are proportional to the amount of leaf and shoot nitrogen, 2) that root respiration is a sum of respiration for maintenance of biomass, for growth and for ion uptake, and 3) that the partitioning of dry matter and N to component organs are constant fractions of the total plant dry matter and N, respectively. The model gave the relative growth rate (RGR), photosynthesis and respiration under steady-state exponential growth for a given nitrogen availability. C. diandra consistently had a higher RGR than C. acutiformis, while the difference in N productivity (growth rate per unit of plant N) was small between the species. Higher photosynthetic rates in C. diandra were caused by a higher N use efficiency in the leaves and by higher N uptake activities in the roots. C. diandra had higher respiration rates in both shoot and roots, but they were more than compensated for by the higher photosynthetic activity. The model predicts that the RGR is more sensitive to proportional changes in photosynthetic nitrogen use efficiency than to changes in respiration coefficients. -from Authors

Original languageEnglish
Pages (from-to)655-665
Number of pages11
JournalFunctional Ecology
Volume3
Issue number6
DOIs
Publication statusPublished - 1 Jan 1989
Externally publishedYes

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