An ecophysiological approach to modelling resource fluxes in competing plants |
| |
Authors: | Lemaire G; Millard P |
| |
Institution: | INRA Station d'Ecophysiologie, F-86600 Lusignan, France; The Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH, UK; Corresponding author; Fax: +33 5 49 55 60 68 |
| |
Abstract: | A conceptual model of resource acquisition and allocation within a
generalized, individual plant growing vegetatively in competition with
others is presented. The model considers C and N acquisition, synthesis of
assimilates and their transport and partitioning, growth of new tissues,
reserve formation and recycling, and losses due to root exudation and
respiration. These processes are regulated by the relative size of the C
and N substrate pools in shoot and roots, in relation to meristematic sink
strength. Translocation and allocation patterns are represented according
to the Minchin phloem transport model. The current model is used to
consider the impact of competition on resource acquisition and allocation,
first by considering a plant growing in isolation and its response to
manipulation of light, CO2 and N supplies. Secondly, competitive plants are
introduced and the direct effects on plant responses in terms of resource
depletion are considered separately from indirect effects such as potential
changes in the quality of resources available (e.g. light quality or soil N
sources). In the past, many studies of plant competition have not
established the importance of these indirect effects because they have not
established all the processes involved in competition. This model can be
used to interpret responses of whole plants to their neighbours in terms of
the relative importance of both the direct and indirect effects of
competition. |
| |
Keywords: | |
本文献已被 Oxford 等数据库收录! |
|