Sap buckets hang from maple trees in Loudon, New Hampshire in 2014. Researchers are studying new ways to make syrup from trees like beeches, birches and sycamores to diversify the industry. (Jim Cole/AP) Researchers at the University of New Hampshire are studying new ways to make syrup out of the northern forest — not from maple trees, but from beeches, birches, sycamores and more. They want to create new markets for an industry that, right now, depends on just one kind of tree — making it vulnerable to disease and climate change. At the tail end of maple sugaring season, other kinds of sap were still flowing freely in the woods of Lee. UNH researcher David Moore had sensors plugged into a stand of beech trees to measure that sap and the conditions helping produce it.