| Autor: |
D.W. Hilbert, J.K. Detling, Dominique Bachelet, H.W. Hunt |
| Rok vydání: |
1983 |
| Předmět: |
|
| DOI: |
10.1016/b978-0-444-42179-1.50055-9 |
| Popis: |
A simple model was created to evaluate and simulate the growth of blue grama plants in hydroponic culture. Two submodels represent the dynamics of carbon (C) and nitrogen (N) taken up from unlimited supply sources and distributed between shoot and root plus crown. Each is divided into structural material characterized by a fixed C:N ratio and metabolic and storage material. It is assumed that root and shoot growth, in a constant environment, are directly related to the C:N ratios of plant tissue, light intensity reduced by self shading being the only external factor limiting plant growth. The structure of the model agrees with the “source-sink” hypothesis in which root growth depends on available assimilates and shoot growth on N supply. The analysis of the system response to stresses such as defoliation and presence of rhizosphere bacteria leads to consideration of controversial subjects such as the relative importance of shoot control versus root control over N uptake, Humphries' (1963) “size of sink” hypothesis versus the competitive theory, and quantitative evaluation of root exudation rate in water culture. The limitations of the present formulation are considered and possible modifications to include morphological and phenological properties and environmental variables are discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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