De-awning of Agropyron spicatum cultivator for use as an understory grass on erosive sites

Carl J. Goebel; Mohammed Tazi

doi:10.5558/tfc67243-3

De-awning of Agropyron spicatum cultivator for use as an understory grass on erosive sites

The Forestry Chronicle ◽

10.5558/tfc67243-3 ◽

1991 ◽

Vol 67 (3) ◽

pp. 243-244

Author(s):

Carl J. Goebel ◽

Mohammed Tazi

Keyword(s):

Pacific Northwest ◽

Temperature Treatment ◽

Apparent Difference ◽

Seedling Vigor ◽

Vegetative Cover ◽

Mechanical Removal ◽

The Pacific ◽

Percent Germination ◽

Agropyron Spicatum ◽

Semi Arid

South-facing, semi-arid slopes supporting sagebush (Artemisia tridentata) with scant understory are difficult sites for establishment of perennial vegetative cover in Central Washington. Blue-bunch wheatgrass (Agropyron spicatum) is the most ubiquitous, widely distributed native perennial where exotic annuals are a competitive problem. It can be found as an understory associate or in open stands.Secar is a cultivar, of A. spicatum developed in the Pacific Northwest. Unfortunately, the percent germination of secar seed has been found to be low. It was suspected that a possible inhibitor exists in the awn and mechanical removal may result in earlier and greater germinative ability for increased establishment on Conservation Reserve Program lands.It was found that total germination was not significantly affected by temperature treatment but an apparent difference in rate was determined. A significant increase in germination occurred with awn removal. Specific location of an inhibitor(s) was not statistically apparent. Key words: Agropyron spicatum, germination, seedling vigor, reseeding

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Weed-species dynamics and management in no-till and reduced-till fallow cropping systems for the semi-arid agricultural region of the Pacific Northwest, USA

Crop Protection ◽

10.1016/j.cropro.2004.03.018 ◽

2004 ◽

Vol 23 (11) ◽

pp. 1097-1110 ◽

Cited By ~ 34

Author(s):

F.L. Young ◽

M.E. Thorne

Keyword(s):

Pacific Northwest ◽

Cropping Systems ◽

Weed Species ◽

Agricultural Region ◽

No Till ◽

The Pacific ◽

Species Dynamics ◽

Semi Arid

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Regrowth of understory epiphytic bryophytes 10 years after simulated commercial moss harvest

Canadian Journal of Forest Research ◽

10.1139/x06-071 ◽

2006 ◽

Vol 36 (7) ◽

pp. 1749-1757 ◽

Cited By ~ 5

Author(s):

JeriLynn E Peck

Keyword(s):

Species Richness ◽

Pacific Northwest ◽

Percent Cover ◽

Coast Range ◽

Vegetative Cover ◽

Oregon Coast Range ◽

The Pacific ◽

Nontimber Forest Product ◽

Term Evaluation

Commercial moss harvest is the predominant disturbance for understory epiphytic bryophyte mats in the Pacific Northwest, yet the rate and dynamics of regrowth of this nontimber forest product are unknown. The first long-term evaluation of cover and species richness regrowth following simulated commercial moss harvest from understory vine maple (Acer circinatum Pursh) shrub stems is reported. Stems harvested of moss on six sites in the Oregon Coast Range in 1994 were examined for species composition and relative abundance of regrowth over the course of a decade. Percent cover increased 5.1%/year, averaging only 51% cover in year 10. Forty percent of the total cover in year 10 was attributable to encroachment from adjacent undisturbed mats and 14% to reestablished litterfall. Shortly after harvest, many taxa established on the newly available habitat, such that species richness surpassed preharvest levels by year 3. In the absence of competitive exclusion even by year 10, species richness continued to exceed preharvest levels by two taxa. Vegetative cover regrowth may require 20 years and volume recovery even longer. Commercial moss harvest should be managed on rotations of several decades, and patchy harvest methods should be encouraged over complete strip harvesting to ensure moss regeneration and promote bryophyte diversity.

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