Ref ID: 10928
Ref Type: Conference Proceeding
Authors: Smethurst, P. J., Mendham, D. S., Battaglia, M., and Misra, R.
Date: 2004
Volume:
Num Volumes:
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Start Page:
End Page: 5
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Conference Date: Aveiro, Portugal, 11-15 October
Conference Title: Eucalyptus in a changing world
Conference Location:
Publisher: IUFRO
Pub Place:
Series Title: Proceedings of an international conference of the WP2.08.03 on silviculture and improvement of eucalypts
Series Editor: Borralho, N. M. G.
Keywords: balance/base/Base cation/base cations/Below-ground/Cabala/cation/code/conference/current/dynamics/eucalypt/Eucalyptus/Eucalyptus nitens/experience/fertility/flux/form/future/growth/growth model/growth-model/impact/index/IUFRO/light/limitation/magnesium/management/mechanism/model/modelling/modellling/models/nitrogen/nutrient/nutrient availability/nutrient modelling/nutrient supply/nutrient-supply/nutrients/optimise/out/P/PCATS/phosphorus/plantation/plantation management/plantation productivity/potassium/predict/prediction/process/productivity/Productivity model/rate/research/resource/site/sites/soil/structure/supply/Tasmania/tree/uptake/water/international/silviculture/improvement
Abstract: INTRODUCTION Mechanistic predictions of plantation growth are now an integral part of eucalypt plantation research and management in many situations around the world (Almeida et al. 2004; Esprey et al. 2004). Most of these models explicitly account for light and water limitations to predict plantation productivity, but deal only superficially with nutrients, usually through a site rating or index (Landsberg and Waring 1997; Battaglia and Sands 1998). Yet many sites where eucalypts are planted require nutrient amendments to optimise productivity (Attiwill and Adams 1996). The current structure of many models is, therefore, significantly out of balance in simplifying or ignoring nutrient fluxes and other below-ground processes. Hence, there is a need for plantation growth models to account for soil fertility and nutrient management more explicitly than many of the currently available models. To be useful in this respect, such models need to correctly predict which nutrients will be limiting growth and the impact of management options that include the form, rate and timing of fertilization. The main mechanisms of nutrient supply and uptake have been known for decades and models incorporating these mechanisms have been validated in some agricultural and plantation conditions (Barber 1995; Tinker and Nye 2000). Our aim here was to link a currently used plantation productivity model (CABALA, Battaglia et al. 2004) with a soil nutrient supply model that mechanistically links phosphorus (P) uptake with the other resources commonly limiting plantation growth (i.e. light, water and nitrogen) that were already explicitly dealt with by CABALA. Future modelling is expected to incorporate the main base cations required for tree growth, i.e. potassium, magnesium and calcium. The code for calculating the supply and uptake of P and base cations (PCATS) operates as a separate module that could be adapted to other soil-plant productivity models. Our aim here is to outline recent experience in developing the PCATS model and linking it to CABALA
Notes: Entered by Maria Ottenschlaeger (20/07/2004). abstract not available, I don't now the propper name for the conference yet, but when I do I will let you know
Address: philip.smethurst@csiro.au
Reprint: Not in File
Program: SPF Sustainable Management
Project: B1; B4
Deliverable: B1-1.1; B4-1.1; B4-3; B1-1.9
Confidentiality: Confidential to All Partners
Availability: Authors
Report: Annual Report 2004/5
Type of Work: Paper