Journal article

Monitoring biochemical limitations to photosynthesis in N and P-limited radiata pine using plant functional traits quantified from hyperspectral imagery

Michael S Watt, Henning Buddenbaum, Ellen Mae C Leonardo, Honey Jane Estarija, Horacio E Bown, Mireia Gomez-Gallego, Robin JL Hartley, Grant D Pearse, Peter Massam, Liam Wright, Pablo J Zarco-Tejada



The prediction of carbon uptake by forests across fertility gradients requires accurate characterisation of how biochemical limitations to photosynthesis respond to variation in key elements such as nitrogen (N) and phosphorus (P). Over the last decade, proxies for chlorophyll and photosynthetic activity have been extracted from hyperspectral imagery and used to predict important photosynthetic variables such as the maximal rate of carboxylation (Vcmax) and electron transport (Jmax). However, little research has investigated the generality of these relationships within the nitrogen (N) and phosphorus (P) limiting phases, which are characterised by mass based foliage ratios of N:P ≤ 10 for N ..

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University of Melbourne Researchers


Awarded by National Institute for Forest Products Innovation

Funding Acknowledgements

We are grateful to Kendra Newick who assisted with the preparation of the nutrient solutions. The project was partly funded through the Resilient Forests programme, which is funded through Scion SSIF as well as the Forest Grower's Levy Trust. Funding was also received from the National Institute for Forest Products Innovation (Project Number NIF073-1819), which comprised contributions from the Australian Government, Australasian Forestry Companies and South Australian and Tasmanian State Governments.