PJB-2021-764
EVALUATE THE BLACK SPRUCE POPULATION SPECIFIC PERIOD OF WARMING THAT’S TRIGGERED BUD BURST AMONG PROVENANCES AND YEARS
ANAM USMANI
Abstract
Recent climate warming has been observed on a global scale, but by examining phonological developmental stages that are dependent on local climatic conditions, temperature changes at the local scale can be responsive. Five black spruce populations are growing under common garden trials among three study years. In this analysis, we have investigated the specific warming period OP(optimal period) that lead bud burst /the beginning of the time of bud burst (BB1) and the last phase of bud burst (BB6)*/ in five provenances among three years concerning the occurrence of time and their mean daily temperature. To check the difference, the length of OP (optimal period) was determined from the number of days DOY (days of the year) between BB1 and BB6 and their corresponding daily temperature changes among provenances and years. Time series analysis was used to describe the correlation trends in the data to find the optimal period length. Overall bud burst leading stage was the most responsive to lead specific warming period and was shown cleared optimal period differences among years, but there are no differences among provenance. It is shown that these results are due to recent daily temperature changes that respond to spring warming among years.
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