Sap runs are getting earlier and less predictable.
That can leave deep snow packs on the ground. Snow reflects sunlight and keeps air temperatures cold longer in the spring. But once snow melts, the darker soil warms up fast, making for a short, intense breakup.
Dulce Ben-East holds a refractometer, which can be used to measure sugar content of sap. “You want to see high sugar, some trees will give us 1.5%. This time of year average is about 1%,” she said. Warmer temperatures are leading to less sugary sap, she said. They struck a few years ago, killing scores of trees throughout Kahiltna Birchworks’ property. Then, winter winds brought the dead trees crashing down onto the network of tubing that brings the sap to a central collection site.
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As Alaska warms, birch tree tappers in Talkeetna wrestle with erratic season - Alaska Public MediaAs Alaska warms, sap runs are getting earlier and less predictable, said Dulce Ben-East, an owner of the longest running birch syrup producer in the state. “I really think of it as climate chaos,” she said. “It seems to get more chaotic every year.”
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