The model fodder production system

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Table of contents

INTRODUCTION
Trees as nitrogen providers in agroforestry systems
Belowground pathways of N transfer
Common mycelial networks
Nitrogenous root exudates
Direct and indirect N transfer
Isotope techniques
Research needs
Objectives of the study
MATERIALS AND METHODS
The model fodder production system
Arbuscular mycorrhizal colonisation (I)
Sampling
Identification of mycorrhizal fungal strains from root samples
Visual determination of mycorrhizal colonisation
Nitrogen transfer pathways (II-IV)
Study design (II-IV)
Root exudation and exudate uptake by grass (III, IV)
Residue decomposition and N uptake by grass (IV)
Analyses of mycorrhizal colonisation, plant biomass and N isotopic composition
Calculations of N transfer
Nitrogen isotopic composition during residue decomposition and its effect on N transfer estimates (II)
Study approach
Model structure
Model parameterisation and simulations
Statistical analyses
RESULTS
Arbuscular mycorrhizal colonisation on the agroforestry field site (I)
Variation of isotopic composition of N sources and its effects on N transfer estimates (II, III)
Nitrogen transfer pathways (II-IV)
Nitrogen transfer in full root interaction and via mycelial networks (III)
Root exudation and exudate N uptake (III, IV)
Nitrogen uptake from decomposing residue (II)
DISCUSSION
Arbuscular mycorrhizal fungal symbionts on the agroforestry field site (I)
Methodological considerations in quantifying belowground N transfer
Quantifying N transfer with isotope techniques (II, III)
Competition in pot culture studies
Nitrogen transfer pathways (III-IV)
Common mycelial networks (III)
Root exudation (III, IV)
IMPLICATIONS OF THE FINDINGS TO AGROFORESTRY RESEARCH AND PRACTICES
Nitrogen transfer in agroforestry systems
Future prospects
CONCLUDING REMARKS
REFERENCES