Tree Population Dynamics in the Hoh Watershed: Tree Population Dynamics, Growth and Mortality in Old-Growth Forests in the Western Olympic Mountains, Washington

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Data_Quality_Information:

Lineage:

Methodology:

Methodology_Type: Field

Methodology_Identifier:

Methodology_Keyword_Thesaurus: None
Methodology_Keyword: vegetation sampling

Methodology_Description:

Twenty-six trees were cored with an increment borer and aged at breast height. The forest is uneven aged. Mountain hemlock, Alaska cedar, and Pacific silver fir trees ranged in age from 155 to 452, 198 to 482, 200 to 438 years, respectively. The stands probably originated after a major disturbance, likely fire, about 500 years ago, with subsequent smaller disturbances. Maximum tree height is 51m and the canopy is uneven. Maximum (DBH) were 126.6, 122.3, and 65.7 cm and 190 cm for Pacific silver fir, mountain hemlock, and Alaska cedar, respectively. Determination of tree species composition, diameter distributions, canopy classes, mortality, and seedling recruitment. Five permanent circular vegetation sample plots (1000 m2) were located in the Hoh Lake watershed. Tree species and DBH were determined on each plot in 1985 and 1990. Trees >5 cm DBH were placed in 20-cm diameter classes. In 1985 number and species of trees with diameters <5 cm DBH were determined on four randomly located 25-m2 plots within each of the larger plots. No ingrowth from the <5 cm diameter class to the 5-24.9 cm diameter class was noted in the 5-year period except for one tree at Hoh Lake. In each plot trees were subjectively assigned a canopy Class dominant). DBH ranges (cm) at each watershed and for each class were as follows: Subcanopy: 5-59; Intermediate: 8-70; Codominant: 29-127; Dominant: 46-122. Tree mortality and likely causes were determined annually from 1985-1990.

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference:: Hoh Lake watershed on the Olympic Peninsula, Washington, USA.

Spatial_Reference_Information:

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label:: Population and mortality of trees <5 cm in diameter by species and canopy class in the lower and upper West Twin Creek watershed, 1985-1990

Attribute:

Attribute_Label: Name of species

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Abies amabilis

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Pseudotsuga menziesii

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Thuja plicata

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Tsuga heterophylla

Attribute:

Attribute_Label: Canopy class

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: dominant

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: codominant

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: intermediate

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: subcanopy

Attribute:

Attribute_Label: individuals/ha

Attribute_Definition: number of trees of a given species in a given year

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1985

Attribute:

Attribute_Label: deaths/ha

Attribute_Definition:

number of trees of a given species dead from 1985-1990

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1990

Attribute:

Attribute_Label: deaths as % of cohort

Entity_Type:

Entity_Type_Label:: Number of trees per hectaire by diameter class and species in the lower and upper West Twin Creek watershed, 1985

Attribute:

Attribute_Label: diameter class (cm)

Attribute:

Attribute_Label: tree species

Attribute:

Attribute_Label: lower watershed

Attribute:

Attribute_Label: upper watershed

Entity_Type:

Entity_Type_Label:: Causes of tree death in permanent plots in the West Twin Creek watershed, 1985-1990

Attribute:

Attribute_Label: Primary cause of death

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: suppression-unknown

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: disease-insects

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: wind

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: crushing

Attribute:

Attribute_Label: Number of trees dead

Attribute:

Attribute_Label: Percentage of trees dead from a particular cause

Entity_Type:

Entity_Type_Label:: Average diameter at breast height (DBH), basal area (BA), and net changes in basal area in the upper and lower West Twin Creek watershed by species and canopy class, 1985-1990

Attribute:

Attribute_Label: tree species

Attribute:

Attribute_Label: canopy class

Attribute:

Attribute_Label: average dbh (cm)

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1985

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1990

Attribute:

Attribute_Label: Basal area (m2ha-1)

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1985

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: 1990

Attribute:

Attribute_Label: Change in basal area (m2ha-1) 1985-1990

Distribution_Information:

Metadata_Reference_Information:

Generated by mp on Thu Aug 5 13:55:03 1999