Selected chemical constituents and deer browsing preference of Douglas fir

1978 ◽  
Vol 4 (6) ◽  
pp. 675-683 ◽  
Author(s):  
M. A. Radwan ◽  
G. L. Crouch
Keyword(s):  
Chemical Constituents ◽  
Douglas Fir ◽  
Deer Browsing

Differences Between Douglas-fir Genotypes in Relation to Browsing Preference by Black-tailed Deer

1972 ◽  
Vol 2 (3) ◽  
pp. 250-255 ◽  
Author(s):  
M. A. Radwan
Keyword(s):  
Essential Oils ◽  
Chlorogenic Acid ◽  
Acid Content ◽  
Inhibitory Action ◽  
Dry Matter ◽  
Chemical Constituents ◽  
Douglas Fir ◽  
Total Phenols ◽  
Deer Browsing ◽  
Dormant Season

Tissue digestibility, essential oils, and levels of several chemical constituents were compared in foliage of Douglas-fir. Genotypes with different susceptibilities to deer browsing were used, and foliage was collected during the dormant season. In general, clones resistant to deer browsing had lower dry-matter and cellulose digestibilities, essential oils with greater inhibitory action on rumen microbial activity, higher content of fats, total phenols, flavanols, and leucoanthocyanins, and lower levels of chlorogenic acid. Results suggest that these resistance characteristics, especially the chlorogenic acid content, might be used instead of conventional bioassays with captive deer, to screen Douglas-fir breeding stock for resistance to deer browsing.

DISPERSION OF KAOLINITE BY WATER EXTRACTS OF DOUGLAS-FIR ASH

1984 ◽  
Vol 64 (3) ◽  
pp. 439-443 ◽  
Author(s):  
PHILIP B. DURGIN ◽  
PHILIP J. VOGELSANG
Keyword(s):  
Key Words ◽  
Chemical Constituents ◽  
Douglas Fir ◽  
Specific Adsorption ◽  
Water Extracts ◽  
Inorganic Constituents

The inorganic constituents of black and gray ash from Douglas-fir slash were analyzed to evaluate the mechanism by which ash extract disperses kaolinite. Chemical constituents promoting kaolinite dispersion were anions that increase alkalinity and are specifically adsorbed, namely orthophosphate, carbonate, hydroxyl, and me-tasilicate. Key words: Fire, specific adsorption, carbonate

Genotype and Season Influence Chlorogenic Acid Content in Douglas-fir Foliage

1975 ◽  
Vol 5 (2) ◽  
pp. 281-284 ◽  
Author(s):  
M. A. Radwan
Keyword(s):  
Chlorogenic Acid ◽  
Acid Content ◽  
Positive Association ◽  
Age Effect ◽  
Douglas Fir ◽  
Genotypic Differences ◽  
Average Content ◽  
Sample Collection ◽  
Deer Browsing

Chlorogenic acid content was determined in foliage of six grafted clones and seven F1 full-sib progenies at three different times during 1971. Detectable amounts of the compound were found in all foliage tissues examined, but levels varied among clones, among progenies, and by season of sample collection. Chlorogenic acid levels in the progeny appeared to be inherited and influenced by both parents. However, average content was substantially higher in the parents than in progenies, reflecting a possible age effect. Results corroborate previous findings with respect to genotypic differences of chlorogenic acid in Douglas-fir foliage and its positive association with susceptibility to deer browsing.

Forest weeding reduces the effect of deer-browsing on Douglas fir

1990 ◽  
Vol 36 (2-4) ◽  
pp. 177-185 ◽  
Author(s):  
Mark Gourley ◽  
Marc Vomocil ◽  
Michael Newton
Keyword(s):  
Douglas Fir ◽  
Deer Browsing

Reduction of deer browsing of Douglas-fir (Pseudotsuga menziesii) seedlings by quadrivalent selenium

1984 ◽  
Vol 7 (3) ◽  
pp. 163-181 ◽  
Author(s):  
G.G. Allan ◽  
D.I. Gustafson ◽  
R.A. Mikels ◽  
J.M. Miller ◽  
S. Neogi
Keyword(s):  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Deer Browsing

Role of lammas growth in recovery of Douglas-fir seedlings from deer browsing, as influenced by weed control, fertilization, and seed source

1996 ◽  
Vol 26 (6) ◽  
pp. 936-944 ◽  
Author(s):  
Brian E. Roth ◽  
Michael Newton
Keyword(s):  
Weed Control ◽  
Nitrogen Fertilization ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Seed Source ◽  
Deer Browsing ◽  
Growing Seasons ◽  
Deer Browse ◽  
Weed Growth

This study examined the effects of weed control, nitrogen fertilization, and seed source on lammas growth (second flushing) in Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings. It also assessed the occurrence of deer browsing as related to these silvicultural treatments and examined the role of lammas growth in seedling recovery and escapement from deer browsing. Weed control significantly increased the occurrence of lammas growth, presumably because of greater soil moisture and nutrient availability. Nitrogen fertilization decreased lammas growth significantly, at least in part by favoring weed growth. Lammas growth was not influenced by seed source. The increased lammas growth associated with weed control mediated the effects of deer browse. Although multiple-year browsing occurred more commonly on weeded than unweeded seedlings, after two growing seasons weeded seedlings that were repeatedly browsed were twice as large as nonbrowsed, nonweeded seedlings. On one site, stock of wild origin was more heavily browsed than that from a seed orchard.

Impacts of live canopy pruning on the chemical constituents of Douglas-fir vascular tissues: implications for black bear tree selection

1998 ◽  
Vol 109 (1-3) ◽  
pp. 51-56 ◽  
Author(s):  
Bruce A Kimball ◽  
Dale L Nolte ◽  
Doreen L Griffin ◽  
Steve M Dutton ◽  
Steve Ferguson
Keyword(s):  
Chemical Constituents ◽  
Black Bear ◽  
Douglas Fir ◽  
Vascular Tissues
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