Orchard pollen contamination: joint estimation of realized levels on current growth and future effects on volume and value at rotation in coastal Douglas-fir in British Columbia
| Autor: | J. E. Webber, Michael Stoehr |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
040101 forestry
Progeny testing 010504 meteorology & atmospheric sciences Sowing Forestry 04 agricultural and veterinary sciences Site index Biology Contamination medicine.disease_cause 01 natural sciences Horticulture Volume (thermodynamics) Pollen contamination Pollen Botany medicine 0401 agriculture forestry and fisheries Orchard 0105 earth and related environmental sciences |
| Zdroj: | Scandinavian Journal of Forest Research. 33:1-5 |
| ISSN: | 1651-1891 0282-7581 |
| Popis: | Pollen contamination was evaluated using control-pollinated seedlings pollinated with polymixes of orchard pollen and pure wildstand and wind-pollinated orchard seedlings. At age 7, seedlings pollinated with contaminate pollen were the shortest across all four sites, but had survival levels (83%) similar to open-pollinated (84%) and pure orchard seedlings (86%). Open-pollinated seedlings had intermediate heights while pure orchard seedlings were tallest. The level of pollen contamination in open-pollinated seedlots was estimated to be 26%. Survival for all pollen sources combined was similar at the two high-elevation sites (84%) and low-elevation sites (86%). Using a yield model to compare volume/ha at rotation age for open-pollinated orchard seedlings and pure orchard seedlings, differences were small and increased due to site index (SI; from 3 to 6 m3/ha) but not due to planting density. Equivalent discounted benefits at rotation were 27 vs. 54 C$/ha at the two extreme site indices (18 vs. 25), ... |
| Databáze: | OpenAIRE |
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