Woodland - Winter 2019 - 10

ISTOCK.COM/LIGORA

Seedlings

CLIMATE CHANGE STUDY FINDS THAT MAPLE SYRUP SEASON MAY COME EARLIER
Once winter nights dip below
freezing and the days warm up above
freezing, sap begins to flow in sugar
maples, marking the start of the syrup
season. U.S. maple syrup production
is a global industry, which has been
increasing by nearly 10 percent per
year over the past decade according
to the USDA's National Agricultural
Statistics Service 2017. With climate
change, daily temperatures are on the
rise, which affects sap flow and sugar
content. By 2100, the maple syrup
season in eastern North America
may be one month earlier than it was
during 1950 and 2017, according to
a study published in Forest Ecology
and Management.
The study examined six sugar
maple stands from Virginia to
Québec, Canada, over a six-year
period. The sugar maple stands
are located in: Divide Ridge in
southwest Virginia; Southernmost
Maple in central Virginia; Indiana
Dunes National Lakeshore in Indiana;
Harvard Forest in Massachusetts;
Dartmouth Organic Farm in Hanover,
New Hampshire; and Chicoutimi in
Québec, Canada.
Maple syrup production is
impacted by two climate sensitive
factors: sugar content, which is
determined by the previous year's
carbohydrate stores and sap flow,
which depends on the freeze/thaw
cycle. As a sugar maple tree thaws,
the frozen sap begins to move
through the tree.
The research team sought to
test how monthly and season-long
average temperatures during the
tapping season, and temperature and
precipitation from the preceding year,
affect sap flow.
10 WOODLAND * Winter 2019

ISTOCK.COM/MCININCH

SOURCE: DARTMOUTH COLLEGE

Each day of the tapping season
(from January to May) across the
study regions, researchers obtained
sap samples from 15 to 25 mature
sugar maple trees. They measured
the volume and weight of the
sap and conducted an analysis
of the sap's sugar content. Daily

temperature readings were also
taken. With this data, the team
could then look at the annual
variability of the sap flow, to see
how the data varied from tree to tree
and from year to year.
Based on historical climate
data, the researchers examined


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Woodland - Winter 2019

Table of Contents for the Digital Edition of Woodland - Winter 2019

OVERSTORY
FORESTS AND FAMILIES
FOREST INTERACTIONS Seedlings
2019 Outstanding Tree Farmers of the Year
Giving Back for the Forests of Tomorrow
Policies And Partnerships Go Hand In Hand For Strong Forests
TOOLS AND RESOURCES
Woodland - Winter 2019 - Intro
Woodland - Winter 2019 - cover1
Woodland - Winter 2019 - cover2
Woodland - Winter 2019 - 3
Woodland - Winter 2019 - OVERSTORY
Woodland - Winter 2019 - 5
Woodland - Winter 2019 - FORESTS AND FAMILIES
Woodland - Winter 2019 - 7
Woodland - Winter 2019 - 8
Woodland - Winter 2019 - 9
Woodland - Winter 2019 - FOREST INTERACTIONS Seedlings
Woodland - Winter 2019 - 11
Woodland - Winter 2019 - 12
Woodland - Winter 2019 - 13
Woodland - Winter 2019 - 14
Woodland - Winter 2019 - 15
Woodland - Winter 2019 - 16
Woodland - Winter 2019 - 17
Woodland - Winter 2019 - 18
Woodland - Winter 2019 - 19
Woodland - Winter 2019 - 2019 Outstanding Tree Farmers of the Year
Woodland - Winter 2019 - 21
Woodland - Winter 2019 - 22
Woodland - Winter 2019 - 23
Woodland - Winter 2019 - 24
Woodland - Winter 2019 - 25
Woodland - Winter 2019 - Giving Back for the Forests of Tomorrow
Woodland - Winter 2019 - 27
Woodland - Winter 2019 - 28
Woodland - Winter 2019 - 29
Woodland - Winter 2019 - 30
Woodland - Winter 2019 - Policies And Partnerships Go Hand In Hand For Strong Forests
Woodland - Winter 2019 - 32
Woodland - Winter 2019 - 33
Woodland - Winter 2019 - 34
Woodland - Winter 2019 - 35
Woodland - Winter 2019 - TOOLS AND RESOURCES
Woodland - Winter 2019 - 37
Woodland - Winter 2019 - 38
Woodland - Winter 2019 - cover3
Woodland - Winter 2019 - cover4
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