Spatiotemporal Modeling of Swedish Scots Pine Stands
2013 (English)In: Forest Science, ISSN 0015-749X, E-ISSN 1938-3738, Vol. 59, no 5, 505-516 p.Article in journal (Refereed) Published
The growth-interaction (GI) process is employed for the spatiotemporal modelling of measurements of locations and radii at breast height made at three different time points of the individual trees in ten Scots pine (Pinus sylvestris) plots from the Swedish NFI. The GI-process places trees at random locations in the study region and assigns sizes to the trees, which interact and grow with time. It has been used to model plots in previous studies and to improve the fit we suggest some modifications: a different location assignment strategy and a different open-growth (growth under negligible competition) function. We believe that the calibration data contain trees that are too small to reflect the open-growth properly, which primarily affects the carrying capacity parameter. To better represent the open-growth of Scots pines, we evaluate the open-growth from a separate set of data (size and age measurements of older and larger single Scots pines). A linear relationship is found between the plot's estimated site indices and the sizes, and this is exploited in the estimation of the carrying capacity. We finally estimate the remaining GI-process parameters and test the goodness-of-fit on simulated predictions from the fitted model.
Place, publisher, year, edition, pages
Society of American Foresters , 2013. Vol. 59, no 5, 505-516 p.
Goodness-of-fit, Open-growth, Richards growth function, Scots pines, Spatio temporal point process
Research subject Mathematical Statistics
IdentifiersURN: urn:nbn:se:umu:diva-63716DOI: 10.5849/forsci.12-007OAI: oai:DiVA.org:umu-63716DiVA: diva2:582445
FunderSwedish Research CouncilSwedish Foundation for Strategic Research