GEOPHYSICAL FACTORS AFFECTING PLANT PRODUCTIVITY

reportActive / Technical Report | Accession Number: AD0705517 | Open PDF

Abstract:

A model for productivity is presented. It combines a model for photosynthesis with an energy budget approach to leaf energy balance. The photosynthesis model describes the rate of photosynthesis of a leaf as a function of leaf temperature, diffusive resistance to CO2 and biochemical reaction rate using the Michaelis-Menton equation. The energy budget approach describes the temperature of a leaf as determined by air temperature incident radiation, wind speed, relative humidity, diffusive resistance to water vapor, leaf size, leaf orientation, and leaf spectral characteristics. When the photosynthesis and energy budget approaches are combined, photosynthetic rate and rate of water loss, transpiration, can be calculated as functions of any combination of the above variables wind speed, air temperature, etc. A number of graphs of this ratio as it varies with several important geophysical factors are given along with comments as to the significance of the relationships.

Author(s):
Gates, David M. ; Johnson, Hyrum B. ; Yocum, Conrad S. ; Lommen, Paul W.
Author Organization(s):
MISSOURI BOTANICAL GARDEN ST LOUIS
Supplementary Note:
See also AD705516. Pub. in Proceedings, International Symposium 'Productivity of Photosynthetic Systems'. Part 2: Theoretical foundations of optimization of the photosynthetic productivity. Moscow (U.S.S.R.) Sep 1969. DOI: 10.21236/AD0705517
Pagination:
0038

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MBG-ONR-002
Contract/Grant Number(s):
N00014-69-C-0048
Task Number(s):
1
Project Number(s):
NR-105-411
Monitor Series:
ONR
 Subject Terms
Joint Capability Areas:
JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*PHOTOSYNTHESIS, TEMPERATURE, WIND, METABOLISM, CLIMATE, CARBON DIOXIDE, HUMIDITY
Field(s)/Group(s):
Biochemistry
Keyword(s):
*MICROCLIMATOLOGY
Report Date:
1969 Sep 01