The effect of spatial structure of forests on the precision and costs of plot-level forest resource estimation View Full Text


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Article Info

DATE

2019-12

AUTHORS

Henrike Häbel, Mikko Kuronen, Helena M. Henttonen, Annika Kangas, Mari Myllymäki

ABSTRACT

We investigated how the precision and costs of forest resource estimates for sample plots of different type and size depend on the spatial structure of forests and jointly studied the effects of tree density and size distribution. Statistically thinking, the trees in a forest can be regarded as a point pattern. Based on the spatial properties of the point pattern, we classified the forests into clustered, random, and regular. We used empirical data from 396 mapped forest plots from Finland. The variance of the unbiased Horvitz-Thompson estimator and expected costs of the basal area and tree density estimation were calculated for 99 different sample plots of different type and size in each of the 396 forest plots. Further, we considered the estimation of the change between two time points for a subset of the data. The precision and expected cost depended on the tree size distribution and spatial pattern of trees. While large sample plots are advisable for clustered forests or the monitoring of young forests with small trees, we see potential for measuring smaller sample plots in regular forests. The choice of sample plot was more important in clustered forests, where also the variability of the expected costs was higher. If the spatial structure of forests could be predicted accurately and precisely prior to field measurements, for instance from remote sensing data, the precision of forest inventories could potentially be improved or costs decreased by allowing the sample plot size and type to vary from one forest stand to another. When using a compromise sample plot over a large region and a long inventory rotation, optimizing the sample plot for one time point ignores possible changes in forest structures caused by changes in forest management practices. More... »

PAGES

8

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s40663-019-0167-1

DOI

http://dx.doi.org/10.1186/s40663-019-0167-1

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1112593563


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