Full TGIF Record # 27787
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Publication Type:
Author(s):Grant, R. F.
Author Affiliation:Department of Soil Science, University of Alberta, Edmonton, Alberta, Canada
Title:Simulation model of soil compaction and root growth: II. Model performance and validation
Source:Plant and Soil. Vol. 150, No. 1, March 1993, p. 15-24.
# of Pages:10
Publishing Information:Dordrecht, Netherland: Martinus Nijhoff Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF00779171
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Bulk density; Resistance; Root growth; Nutrient uptake; Models; Compaction
Abstract/Contents:"Soil compaction is a widespread cause of reduced plant productivity. If the effects of soil compaction on plant growth are to be reproduced in simulation models, then the processes through which compaction reduces root elongation must be expressed mathematically and then tested against experimental data. The mathematical theory by which these processes may be represented is given in the accompanying article. In this article, the behavior of a simulation model based on this theory is tested against data for root growth and soil gas concentration recorded from soil columns of which the middle layers were compacted to different bulk densities. The model was able to reproduce the failure of the root system to penetrate the compacted middle layer within the period of the experiment when bulk density exceeded 1.55 Mg m-3. The model also reproduced decreases in O2 concentrations, and increases in CO2 concentrations, in the atmospheres of the compacted layer and of the uncompacted layer below it as bulk density of the compacted layer increased. The simulated time course of O2 and nutrient uptake and of O2 concentrations in the compacted layer at different depths is presented and its consistency with experimental findings is examined. As part of a larger ecosystem model, this model will be useful in estimating site-specific effects of soil compaction on carbon cycling in agroecosystems."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Grant, R. F. 1993. Simulation model of soil compaction and root growth: II. Model performance and validation. Plant Soil. 150(1):p. 15-24.
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