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The Effect of Nitrogen Fertilization and Rock Type on Individual Tree Mortality Item Info

An individual tree mortality model for nitrogen fertilized Douglas-fir (Pseudotsuga menziesii var. gIauca (Beissn.) Franco) stands was developed using data from permanent research plots located throughout the inland Northwest. The proposed linear logistic model included the following independent variables: a set of dummy variables for the 5 rock types, a set of dummy variables for the 3 nitrogen fertilizer treatments, diameter at breast height, crown ratio, number of trees per hectare, and relative rank of tree size, defined by basal area in larger trees over basal area per ha. The results show that nitrogen fertilization and rock type significantly affect individual tree mortality. Trees growing on granitic and meta-sedimentary rocks exhibited greater probabilities of mortality than did those growing on other rocks. The probabilities of mortality for trees growing on sedimentary rocks were very low. The probabilities of tree monality increased with increasing nitrogen fertilizer application rates. Finally, nitrogen fertilization response ratios for annual probability of tree mortality were estimated based on the mortality model. The response ratios were nearly constant (about 1.54) across a range of tree diameters for all rock types with the 224 kg N treatment. The response ratios were also nearly constant (about 2.50) across a range of tree diameters for all rock types with the 448 kg N treatment.

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Title:
The Effect of Nitrogen Fertilization and Rock Type on Individual Tree Mortality
Creator:
Shen, G.; Hatch, C.R.; Moore, J.A.
Date Created (ISO Standard):
1999-12-01
Description:
An individual tree mortality model for nitrogen fertilized Douglas-fir (Pseudotsuga menziesii var. gIauca (Beissn.) Franco) stands was developed using data from permanent research plots located throughout the inland Northwest. The proposed linear logistic model included the following independent variables: a set of dummy variables for the 5 rock types, a set of dummy variables for the 3 nitrogen fertilizer treatments, diameter at breast height, crown ratio, number of trees per hectare, and relative rank of tree size, defined by basal area in larger trees over basal area per ha. The results show that nitrogen fertilization and rock type significantly affect individual tree mortality. Trees growing on granitic and meta-sedimentary rocks exhibited greater probabilities of mortality than did those growing on other rocks. The probabilities of mortality for trees growing on sedimentary rocks were very low. The probabilities of tree monality increased with increasing nitrogen fertilizer application rates. Finally, nitrogen fertilization response ratios for annual probability of tree mortality were estimated based on the mortality model. The response ratios were nearly constant (about 1.54) across a range of tree diameters for all rock types with the 224 kg N treatment. The response ratios were also nearly constant (about 2.50) across a range of tree diameters for all rock types with the 448 kg N treatment.
Subjects:
research fertilizer timber (lumber) statistics
Source:
Shen, G., C.R. Hatch, J.A. Moore. 1999. IFTNC Supplemental Report No. 7, The Effect of Nitrogen Fertilization and Rock Type on Individual Mortality. IFTNC, FWR, Univ. of Idaho, Moscow.
Source Identifier:
The_Effect_of_Nitrogen_Fertilization_and_Rock_Type_on_Individual_Tree_Mortality_IFTNC_1999
Type:
Text
Format:
application/pdf

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Preferred Citation:
"The Effect of Nitrogen Fertilization and Rock Type on Individual Tree Mortality", Intermountain Forestry Cooperative, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iftnc/items/iftnc4818.html
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This document is provided by the University of Idaho Library for use by University of Idaho students, staff, and faculty. All rights to the document linked from this metadata belong to the author, rights holder, and/or provider. For more information contact The Intermountain Forestry Cooperative, https://www.uidaho.edu/cnr/ifc
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