Concepts of Modelling Carbon Allocation among Plant Organs
نویسنده
چکیده
The simulation of carbon allocation among plant organs is one of the weakest features of crop growth models. This paper briefly discusses five concepts of modelling carbon partitioning: 1. Descriptive allometry, proposing a predetermined ratio between the (relative) growth rates of plant organs; 2. Functional equilibrium, proposing an equilibrium between root and shoot activity; 3. Canonical modelling, a mathematical approach based on only a qualitative understanding of the allocation process; 4. Sink regulation, proposing allocation to be determined by sink strengths of the different organs; and 5. Transport resistance, calculating carbon transport from source to sink through a resistance and its utilization in the sink organs. These five concepts are ordered in increasing complexity. Pros and cons of the different concepts are discussed. The most appropriate concept will depend on the species studied and the aim of the research.
منابع مشابه
Plant sink-source relationships and carbon isotopic labeling techniques . Taher Barzegar* and Fatemhe Nekounam
The concept of source and sink strength is presently well-recognized and accepted by the scientific community as a pertinent approach describing the mechanisms of carbohydrate partitioning into the different and competing organs at a whole plant or canopy scales. Sink–source relationships have a clear role in the size of sink organs. Besides the effect on organ size, sink/source ratio might also...
متن کاملCarbon Allocation to Root and Shoot Systems of Woody Plants
Carbon allocation to roots is of widespread and increasing interest due to a growing appreciation of the importance of root processes to whole-plant physiology and plant productivity. Carbon (C) allocation commonly refers to the distribution of C among plant organs (e.g., leaves, stems, roots); however, the term also applies to functional categories within organs such as defense, injury, repair...
متن کاملMechanistic modelling of carbon allocation among sinks A generalised Münch model for branched architectures
Partitioning of carbohydrate between competing sites is fundamental to all plant development, growth, and eventually yield. Carbohydrate is synthesised in the mature leaves and distributed by the phloem vasculature to sites of utilisation. The mechanism currently believed to drive phloem transport was proposed by Münch in 1928 and only recently generally accepted. However, the processes determi...
متن کاملAn approach for intermediate-level simulation of carbon allocation in functional-structural plant models
Functional-structural models that include detailed mechanistic representation of underlying physiological processes can be difficult and expensive to build, and the resulting models are often very complicated. This is particularly true when representing carbon allocation, as the various processes involved are relatively poorly understood. Purely empirical models, on the other hand, are simpler ...
متن کاملN uptake and distribution in crops: an agronomical and ecophysiological perspective.
The rate of N uptake of crops is highly variable during crop development and between years and sites. However, under ample soil N availability, crop N accumulation is highly related to crop growth rate and to biomass accumulation. Critical N concentration has been defined as the minimum N concentration which allows maximum growth rate. Critical N concentration declines during crop growth. The r...
متن کامل