1. General Model Information
Name: Rubber model for potential and water limited conditions
Acronym: EMB_RUBBER
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
Contact:
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
email:
doct30@rcl.wau.nl
Author(s):
M.S.B. Bernardes
email: doct30@rcl.wau.nl
Abstract:
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