1. General Model Information

Name: Rubber model for potential and water limited conditions


Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem, organism
Type of model: compartment model
Main application:
Keywords: crop science, forestry, rubber, farming systems, agricultural economics, biomass, leaf area index, rubber yield, carbon balance, water balance


Mr. M.S.B. Bernardes
Wageningen Agricultural University
Dept. Theoretical Production Ecology
P.O.Box 430
6700 AK Wageningen
THE NETHERLANDSPhone: +31.8370.75766
Fax :+31.8370.84892


M.S.B. Bernardes
email: doct30@rcl.wau.nl


Rubber model for potential and water limited conditions. It consists of a carbon and water balance and simulates the dry matter accumulation, the girth of the trees and the rubber yield, among other variables. The photosynthesis process is calculated based on the light response curve of the leaves, the light distribution within the canopy and the amount of radiation intercepted by the canopy. Maintenance respiration is simulated according to the amount of dry matter and to the protein and mineral content of each plant organ. Partition of assimilates is distributed to the plant parts in function of their growth rate and energy content. Growth rate of rubber pool is preferential over other plant parts and is calculated in a specific section of the model. Simulation of rubber biosynthesis and accumulation in the bark is sink and source limited. The maximum size of the sink (rubber pool) is set as a fraction of the weight of stems. The tapping frequency is depicted by an impulse function. The daily rubber yield is a function of the girth size and the latex flow parameters. EMB-RUBBER can be used for experimental studies and for extrapolation purposes.

Author of the abstract:
CAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible PC/AT >= 640 Kb RAMExecutables are available from the Author (freeware)

II.2 Source-code:

Programming Language(s): PCMP/CSMP (IBM) Source-code is available from the Author (freeware)

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables:
Phenological development, leaf and canopy photosynthesis, maintenance andgrowth respiration, crop growth, growth of plant organs, growth rate of rubber pool, transpiration(and others).
Number of rate variables: > 60.
State variables:
Biomass (total and per crop organ e.g. leaf, stem, trunk, roots), leaf area index,rubber yield (and others).
Number of state variables: > 30.

III.2.1 Input

Geographical latitude and longitude, weather data (daily rainfall, monthly sunshinehours, relative humidity, minimum and maximum temperature, wind speed), crop physiologicaland morphological properties, physical soil properties, crop management information.
Number of input data: 45.

III.2.2 Output

Crop rate and state variables (e.g. biomass, leaf area index, number of trees, rubberyield).
Number of output data: 10.
Time interval of simulation: 1 day.
Basic spatial unit: m2 and ha.

IV. References

Bernardes et al., 1994.
Evaluation of the 'EMB-RUBBER' model for estimating growth and yield.
Proc. 3rd ESA Congress, Abano-Padova, 1994. 314-315

Castro, A.M.G, 1988.
Evaluation of the 'EMB-RUBBER' model for estimating growth and yield.
PhD thesis. Reading, Univ. of Reading. 294 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: T. Gabele: 07.07. 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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