MODELS OF THE RHIZOSPHERE .1. MICROBIAL-POPULATION DYNAMICS AROUND A ROOT RELEASING SOLUBLE AND INSOLUBLE CARBON

被引:111
作者
DARRAH, PR
机构
[1] Soil Science Laboratory, Department of Plant Sciences, University of Oxford, Oxford, OX1 3PF, Parks Rd
关键词
INSOLUBLE CARBON; MATHEMATICAL MODEL; POPULATION DYNAMICS; RHIZOSPHERE; SOLUBLE CARBON;
D O I
10.1007/BF00009191
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
A mathematical model has been developed which is capable of simulating the population dynamics of microbial biomass surrounding a root which is releasing soluble and insoluble carbon compounds into the soil. The model simulates the interconversions of C between different pools within the soil as well as the diffusion and mass flow of soluble carbon. Two main aspects of carbon release were examined: (i) a strategy where exudate was released uniformly over the root surface was compared to the case where exudation was confined to a small region behind the root tip; (ii) the situation in which all the C released was in soluble form was compared to the case of an approximately equal partition between soluble and insoluble forms. Substantial differences between the different simultations were found. It was shown that the maximum concentration and penetration of soluble exudates differed markedly between different simulations and the implications of this for micronutrient acquisition by phytosiderophores and for colonisation of the rhizosphere by root pathogens were discussed. The different simulations also predicted very different biomass distributions in the rhizosphere in both space and time.
引用
收藏
页码:187 / 199
页数:13
相关论文
共 28 条