Levels-of-growing-stock cooperative study in Douglas-fir: report no. 09&#151;Some comparisons of DFSIM estimates with growth in the levels-of-growing-stock study.

Robert O. Curtis

doi:10.2737/PNW-RP-376

Treesearch

Levels-of-growing-stock cooperative study in Douglas-fir: report no. 09—Some comparisons of DFSIM estimates with growth in the levels-of-growing-stock study.

Informally Refereed

Authors:

Robert O. Curtis

Year:

1987

Type:

Research Paper

Station:

Pacific Northwest Research Station

DOI:

https://doi.org/10.2737/PNW-RP-376

Source:

Res. Pap. PNW-RP-376. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 44 p

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Abstract

Initial stand statistics for the levels-of-growing-stock study installations were projected by the Douglas-fir stand simulation program (DFSIM) over the available periods of observation. Estimates were compared with observed volume and basal area growth, diameter change, and mortality. Overall agreement was reasonably good, although results indicate some biases and a need for revision of the upper density limit in the DFSIM program.

Keywords

simulation, projections (stand), model validation, statistics (stand), growing stock (increment/yield, Douglas-fir, Pseudotsuga menziesii)

Citation

Curtis, Robert O. 1987. Levels-of-growing-stock cooperative study in Douglas-fir: report no. 09—Some comparisons of DFSIM estimates with growth in the levels-of-growing-stock study. Res. Pap. PNW-RP-376. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 44 p