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Results

The results of this experiment are abbreviated and generalized in this document to conserve space. For design and result detail, reference Alpine Light Study in Bridger Plant Materials Center 1996 to 2003 Technical Report, Volume 2 – Woody Plant, Propagation, and Germination Research.

  • Mean percentage germination by treatment appears in Chart 1 (For data only see Table 1.)
  • Mean percentage germination before and after exposure to a secondary full irradiance treatment appears in Chart 2 (For data only see Table 2.)
  • Percentage germinant mortality resulting from contamination prior to secondary full irradiance appears in Chart 3 (For data only see Table 3.)
  • Percentage germination by treatment adjusted for germinant mortality prior to secondary full irradiance appears in Chart 4 (For data only see Table 4.)
  1. In most cases, the use of erosion control blanket (Blanket) resulted in statistically less germination than when no erosion control blanket (No Blanket) was used.
  2. In all cases, No Light treatments (complete light exclusion) resulted in statistically less percentage germination than the No Blanket treatments, and in most cases, less percentage germination than the Blanket treatments.
  3. Although species dependent, the exposure of the three treatments to a secondary full irradiance treatment frequently resulted in additional germination. This appears to be both irradiance duration and intensity related.
  4. There was greater percentage contamination of germinated seeds of some species with the Blanket and No Light treatments than the No Blanket treatment.
Chart 1. Mean percentage germination by treatment.
Chart 1 showing the mean percentage germination by treatment. For actual data see Table 1.
Table1. Mean percentage germination by treatment.
Type of Treatment Percent Germination by Species
Antennaria alpina Carex haydeniana Carex paysonis Carex phaeocephala Senecio triangularis Sibbaldia procumbens
No Blanket 65.6 44.8 56.8 24.8 61.6 19.2
Blanket 57.6 16.0 34.4 25.6 15.2 5.6
No Light 33.6 0.8 33.6 0.0 18.4 0.0
Chart 2. Mean percentage germination before vs. after secondary full irradiance treatment.

Chart 2 showing the mean percentage germination before vs. after secondary full irradiance treatment. For actual data see Table 2.

Table 2. Mean percentage germination before vs. after secondary full irradiance treatment.
Type of Treatment Mean percentage germination by Species
Antennaria alpina Carex haydeniana Carex paysonis Carex phaeocephala Senecio triangularis Sibbaldia procumbens
No Blanket 65.6 44.8 56.8 24.8 61.6 19.2
No Blanket plus Secondary Irradiance 65.6 44.8 56.8 28.0 62.4 28.0
Blanket 57.6 16.0 34.4 25.6 15.2 5.6
Blanket plus Secondary Irradiance 57.6 16.0 35.2 26.4 15.2 7.2
No Light 33.6 0.8 33.6 0.0 18.4 0.0
No Light plus Secondary Irradiance 35.2 4.8 33.6 80 22.4 17.6
Chart 3. Percentage germinant mortality resulting from contamination prior to secondary full irradiance.

Chart 3 showing the percentage germinant mortality resulting from contamination prior to secondary full irradiance. See Table 3 for actual data.

Table 3. Percentage germinant mortality resulting from contamination prior to secondary full irradiance.
Type of Treatment Percent Contamination by Species
Antennaria alpina Carex haydeniana Carex paysonis Carex phaeocephala Senecio triangularis Sibbaldia procumbens
No Blanket 1.2 0 0 0 0 12.5
Blanket 73.6 5.0 0 0 5.3 57.1
No Light 47.6 0 0 0 8.7 0
Chart 4. Percentage germination adjusted for germinant mortality prior to secondary full irradiance.

Chart 4 showing percentage germination adjusted for germinant mortality prior to secondary full irradiance. For actual data, see Table 4.

Table 4. Percentage germination adjusted for germinant mortality prior to secondary full irradiance.
Type of Treatment Percent Germination by Species
Antennaria alpina Carex haydeniana Carex paysonis Carex phaeocephala Senecio triangularis Sibbaldia procumbens
No Blanket 64.8 44.8 56.8 24.8 61.6 14.3
Blanket 15.2 15.2 34.4 25.6 14.4 2.4
No Light 17.6 0.8 33.6 0 16.8 0

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Last Modified: 08/21/2008