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You are here >1Up Info > Wildlife, Animals, and Plants > Plant Species > Forb > SPECIES: Acroptilon repens | Russian Knapweed
 

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FIRE ECOLOGY

SPECIES: Acroptilon repens | Russian Knapweed

FIRE ECOLOGY OR ADAPTATIONS:


Fire adaptations: | Russian Knapweed Information regarding fire adaptations of Russian knapweed is not available in the literature. Russian knapweed has a deep-seated, extensive perennial root system that is likely to allow it to survive even severe fire, depending on site conditions. Russian knapweed is also capable of establishing from seed; however, the tolerance of the seeds to heating is unknown, and seed dispersal over any distance larger than the height of the plant requires a dispersal agent [2,58]. It is not known whether Russian knapweed is likely to establish from seed after fire.

Fire regimes: | Russian Knapweed Russian knapweed occurs primarily in agricultural communities in the western U.S. and southwestern Canada, where historic fire regimes have been dramatically altered. The historic fire regimes of the more native communities in which Russian knapweed sometimes occurs are of varied frequency and severity. Russian knapweed did not occur in these communities at the time in which historic fire regimes were functioning, but has established since fire exclusion began. It is unclear how historic fire regimes might affect Russian knapweed populations. It is also unclear how the presence of Russian knapweed might affect these fire regimes. Dense infestations of Russian knapweed may change the fire regime by changing the fuel characteristics and fire return interval at a given site. Research in this area is needed.

The following table provides some fire regime intervals for communities and ecosystems in which Russian knapweed may be found:

Community or Ecosystem Dominant Species Fire Return Interval Range (years)
sagebrush steppe Artemisia tridentata/Pseudoroegneria spicata 20-70 [53]
basin big sagebrush A. tridentata var. tridentata 12-43 [63]
mountain big sagebrush A. t. var. vaseyana 15-40 [5,15,46]
Wyoming big sagebrush A. t. var. wyomingensis 10-70 (40**) [79,89]
saltbush-greasewood Atriplex confertifolia-Sarcobatus vermiculatus < 35 to < 100
desert grasslands Bouteloua eriopoda and/or Pleuraphis mutica 5-100
plains grasslands B. spp. < 35
blue grama-needle-and-thread grass-western wheatgrass B. gracilis-Hesperostipa comata-Pascopyrum smithii < 35 [53]
curlleaf mountain-mahogany* Cercocarpus ledifolius 13-1000 [6,65]
mountain-mahogany-Gambel oak scrub C. l.-Quercus gambelii < 35 to < 100
western juniper Juniperus occidentalis 20-70
Rocky Mountain juniper J. scopulorum < 35
creosotebush Larrea tridentata < 35 to < 100
pinyon-juniper Pinus-Juniperus spp. < 35 [53]
mountain grasslands Pseudoroegneria spicata 3-40 (10**) [3,4]
elm-ash-cottonwood Ulmus-Fraxinus-Populus spp. < 35 to 200 [24,82]
*fire return interval varies widely; trends in variation are noted in the species summary
**mean

POSTFIRE REGENERATION STRATEGY [74]:


Geophyte, growing points deep in soil
Secondary colonizer (on-site or off-site seed sources)

Related categories for SPECIES: Acroptilon repens | Russian Knapweed

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Content on this web site is provided for informational purposes only. We accept no responsibility for any loss, injury or inconvenience sustained by any person resulting from information published on this site. We encourage you to verify any critical information with the relevant authorities.

Information Courtesy: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Fire Effects Information System

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