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Tree growth and soil relations at the 1925 Wind River Spacing Test in coast Douglas-fir by Miller, Richard E. is a nonfiction available to read on EtoBox.

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"The 1925 Wind River spacing test is the earliest field trial seeking to determine the most appropriate spacing for planting Douglas-fir. Spacing treatments were not replicated, although individual spacings were subsampled by two to four tree-measurement plots. Previously, greater growth occurred at the wider spacings (10 and 12 ft) than at the closer spacings (4, 5, 6, and 8 ft). We considered three possible explanations: (1) close spacing eventually retarded growth, (2) soil quality may be better in the 10- and 12-ft spacings than at closer spacings, and (3) tree spacing and soil quality combined affected growth. To test these explanations, we (1) measured and mapped several site factors (topographic relief, depth to bedrock, and soil properties) and (2) related these factors to tree and stand growth. We infer from the strong correlation between spacing and soil variables that the influence of soil and spacing cannot be separated; differences in soil depth and available water capacity confound spacing effects and vice versa. Because soils in the wider spacings are generally deeper and have more available water capacity than do soils in the closer spacings, we conclude that some o

Who reads Tree growth and soil relations at the 1925 Wind River Spacing Test in coast Douglas-fir?

Author

Miller, Richard E.

Publisher

U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2004]

Published

2004

Language

EN

Category

nonfiction