Hi, wondering if anybody can point me in the direction of some reliable non-wood-forest-product yield data in the temperate zone.
Specifically the production of Cherries (Prunus avium and domesticated cultivars), Walnuts (Juglans regia but also J. nigra etc.), Chestnuts (Castanea sativa, cultivars and related species) and finally Sorbus berries (Sorbus domestica, S.torminalis & S. aucuparia).
In the best case data on a 'per tree' basis relating yield to basic tree parameters (DBH/crown volume etc.) would be fantastic. More realistic would be values per hectare given a certain stocking density, prescribed management and information about the mean tree (as above DBH/crown parameters etc.). Furthermore, data covering a number of years would go a short way to negate fluctuating production due to external influence.
Can anyone help?
Much Appreciated
Jon
In my opinion, the direct and reliable data should be from harvest. I know some scientists research on Illicium verum yield by harvest.
Thanks, this is true and something I am working on for Prunus, Juglans and Sorbus. However, data often hasn't been published for non-cultivar varieties produced in forest stands, this would be really interesting for European forests.
Please look for the Ecological Primer by Chuck Peters of the New York Botanical gardens and also reports on forest Ecosystem into national parks in Uganda by Alan Charles Hamilton 1991 you should be able to get some where by factoring in the tropical scenario viz temperate scenario in terms of growth rates BUT to be specific try the ecological studies done by Department of Environment University York in UK on Dalbey forest.
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