We greatly appreciate the support of Jason Veil the Curator of the Arboretum. Many thanks to the Secrest Arboretum for permission to core these impressive trees. The College of Wooster Paleoclimate class mulls around the Dawn Redwood stand.Īnother great photo of Dawn Redwoods – they are deciduous conifers so this photo in the early spring before growth. This negative relationship may go away as warming continues and frosts become less frequent.įigure above shows three photos of cores from Dawn Redwood – note the narrow 1988 drought ring (white dots). The negative correlation with winter is hypothesized to be linked to warming winters leading to less snow cover leaving roots exposed and vulnerable to damaging frosts. The summer relationship makes sense as hot summers require higher evapotranspiration demands. The lower blue and red graph (B) is the climate response of the trees – temperature (red bars) is strongly negatively correlated with summer (June and July) temperatures and with February temperature. Future response of this species to a changing climate will depend on the relative rates of warming maximum temperatures in the winter and summer, as well as changing moisture conditions during the summer months.įigure above shows the tree-ring record from a stand of 19 Dawn Redwood trees (upper panel A). These results have implications for the future as climate change affects the native and transplanted range of this species. Higher numbers represent more temperate areas. Zone 0 covers the harshest areas in Canada for plant species. The mean annual temperature, precipitation, and potential evapotranspiration are 14.50 ☌, 1055.70 mm, and 1006.70 mm, respectively. The climate of the study site is that of the monsoon subtropical moist marine climate zone. Hardiness zones are based largely on climate, particularly minimum temperatures. Metasequoia glyptostroboides is a deciduous conifer of a redwood family of Cupressaceae. A positive May to June precipitation correlation is the strongest moisture signal (p < 0.05) and the narrowest rings in the chronology occurred during the drought of 1987 to 1988, consistent with one of the warmest and driest Junes on record. A hardiness zone is a geographically defined area where a given plant is capable of growing. glyptostroboides trees planted in Secrest Arboretum in northeast Ohio, USA-shows negative correlations with maximum monthly temperatures: with the strongest relationship with February and the warm months of June and July, all significant at the 99% confidence levels. An annual ring-width chronology-spanning 1955 to 2010 and based on a stand of 19 M. Analyzing the climate response of a transplanted stand of the trees can give insights into their physiological plasticity, into their use in restoration and reforestation, as well as into interpreting the environmental conditions of the geologic past from fossil Metasequoia. Metasequoia glyptostroboides,a deciduous gymnosperm, also known as dawn redwood, was thought to be extinct until living members of the species were found in China in 1943.
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