Climate-influenced ponderosa pine (Pinus ponderosa) seed masting trends in western Montana, USA
| Autor: | Rubén Manso González, Christopher R. Keyes |
|---|---|
| Přispěvatelé: | University of Montana, Laboratoire d'Etudes des Ressources Forêt-Bois (LERFoB), AgroParisTech-Institut National de la Recherche Agronomique (INRA) |
| Rok vydání: | 2015 |
| Předmět: |
production de semences
montana [SDV]Life Sciences [q-bio] Forest management Soil Science Biology reproduction Crop seed periodicity chemistry.chemical_compound regénération forestière naturelle natural regeneration uneven-aged management Rocky Mountains amérique du nord Mast (botany) Precipitation lcsh:Forestry Ecology Evolution Behavior and Systematics Silviculture arbre forestier résineux Ecology food and beverages périodicité Forestry 15. Life on land Agronomy chemistry Seed treatment Frost forêt de montagne lcsh:SD1-669.5 pinus ponderosa Woody plant |
| Zdroj: | Forest Systems; Vol 24, No 1 (2015); e021 Forest Systems Instituto Nacional de Tecnología Agraria y Alimentaria (INIA) FOREST SYSTEMS FOREST SYSTEMS, 2015, 24 (1), ⟨10.5424/fs/2015241-05606⟩ Forest Systems, Vol 24, Iss 01, p e021 (2015) Forest systems 1 (24), . (2015) |
| ISSN: | 1983-1994 2171-9845 2171-5068 |
| DOI: | 10.5424/fs/2015241-05606⟩ |
| Popis: | Aim of study: The aim of this study was to analyze 10-year records of ponderosa pine (Pinus ponderosa) seed production, in order to confirm synchronic seed production and to evaluate cyclical masting trends, masting depletion effect, and climate-masting relationships.Area of study: The study area was located in a P. ponderosa stand in the northern Rocky Mountains (western Montana, USA).Material and methods: The study was conducted in one stand that had been subjected to a silvicultural study of uneven-aged management techniques that was carried out in 1984, and which resulted in three separate units consisting of one control, one cut/no-burn treatment, and one cut/burn treatment. Seeds were collected during the 10 years following treatment in 15 traps systematically deployed within each of the stand’s three units. The total numbers of seeds collected in each unit were plotted over time to analyze crop synchrony, with Spearman rank correlation coefficient used to test for masting cycles and crop depletion after a mast year. Meteorological records over the period 1983-1994 were related to the occurrence of a mast event (defined as crops exceeding 50,000 viable seeds/ha).Main results: The seed production pattern was non-cyclical, synchronous, and independent of silvicultural treatment history. A mast-depletion effect was evident but was not statistically significant. Mast events seem to be promoted by the occurrence of optimum mean temperatures at the beginning of spring during both the first (11 °C) and second (9 °C) years of cone maturation. The probability of a mast year was also affected by summer temperature (number of late frost days; negative effect) and precipitation amount (positive effect). All these factors would seemingly explain the observed synchronous pattern in cone production.Research highlights: The non-cyclical trend of ponderosa pine seed mast years is influenced by specific climate determinants. Fluctuations in mean early spring temperatures, late frost and water availability are likely to affect P. ponderosa seed production, with implications for natural regeneration in this region.Key words: natural regeneration; seed periodicity; reproduction; uneven-aged management; Rocky Mountains. |
| Databáze: | OpenAIRE |
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