Modelling the Components of Plant Respiration: Representation and Realism

作者：J. H. M. Thornley · 发表于：Annals of Botany · 年份：2000 · DOI：10.1006/anbo.1999.0997 · 被引用次数：272 · 研究领域：Plant Water Relations and Carbon Dynamics、Soil Carbon and Nitrogen Dynamics、Plant nutrient uptake and metabolism

This paper outlines the different ways in which plant respiration is modelled, with reference to the principles set out in Cannell and Thornley ( Annals of Botany85 : 55–67, 2000), first in whole-plant ‘toy’ models, then within ecosystem or crop models using the growth-maintenance paradigm, and finally representing many component processes within the Hurley Pasture (HPM) and Edinburgh Forest Models (EFM), both of which separate C and N substrates from structure. Whole-plant models can be formulated so that either maintenance or growth respiration take priority for assimilates, or so that growth respiration is the difference between total respiration and maintenance associated with the resynthesis of degraded tissues. All three schemes can be converted to dynamic models which give similar, reasonable predictions of plant growth and respiration, but all have limiting assumptions and scope. Ecosystem and crop models which use the growth-maintenance respiration paradigm without separating substrates from structure, implicitly assume that maintenance respiration is a fixed cost, uncoupled to assimilate supply, and use fixed rate coefficients chosen from a range of measured values. Separation of substrates in the HPM and EFM enables estimates to be made of respiration associated with local growth, phloem loading, ammonium and nitrate N uptake, nitrate reduction, N 2 fixation and other mineral ion uptake, leaving a ‘residual maintenance’ term. The latter can be explicitly related to...