Dec. 19, 2011 — COLLEGE STATION, Texas — As many as 500 million trees
scattered across the Lone Star State have died this year as a result of the unrelenting
drought, according to preliminary estimates from Texas Forest Service.
The numbers were derived by Texas Forest Service foresters, who canvassed
local forestry professionals, gathering information from them on the drought
and its effect on trees in their respective communities.
Each forestry expert estimated the percentage of trees in their region that
have died as a result of the 2011 drought. That percentage was applied to the
estimated number of trees in the region, a figure determined by the agency’s
Forest Inventory & Analysis (FIA) program.
Using this approach, an estimated 100 million to 500 million trees with a
diameter of 5 inches or larger on forestland were estimated to have succumbed to
the drought. That range is equivalent to 2 to 10 percent of the state’s 4.9
billion trees.
“In 2011, Texas experienced an exceptional drought, prolonged high winds and
record-setting temperatures. Together, those conditions took a severe toll on
trees across the state,” said Burl Carraway, Sustainable Forestry department
head. “Large numbers of trees in both urban communities and rural forests have
died or are struggling to survive. The impacts are numerous and widespread.”
The preliminary estimates indicate three multi-county areas appear to be the
hardest hit. The area including Sutton, Crockett, western Kimble and eastern
Pecos counties saw extensive mortality among Ashe junipers.
The area including Harris, Montgomery, Grimes, Madison and Leon counties saw
extensive mortality among loblolly pines. Western Bastrop and eastern Caldwell
counties, as well as surrounding areas, saw extensive mortality among cedars
and post oaks.
Additionally, localized pockets of heavy mortality were reported for many
other areas.
Texas Forest Service foresters plan to use aerial imagery to conduct a more
in-depth analysis in the spring, which is when trees that may have gone into
early dormancy — an act of self-preservation — could begin to make a comeback.
A more scientific, long-term study will be completed as the agency collects
data through its FIA program. Considered a census for trees, the
federally-funded program allows the agency to keep a close watch on trees — and
how they’re growing and changing — across the state.
As part of the program, foresters are tasked with surveying certain,
designated plots of land each year. Because the state is so big, it takes a
decade to complete a full inventory cycle.
“Quantifying the impacts of a statewide drought on tree survival is no small
task,” Carraway said, noting that Texas was home to 63 million acres of
forestland, much of which is in remote areas.
“During this time of year, it’s difficult to tell in some cases if a tree is
truly dead. And keep in mind that the drought is ongoing. We fully expect
mortality percentages to increase if the drought continues.”
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Contacts:
Dr. Chris Edgar, Forest Resource Analyst
979-458-6630, cedgar@tfs.tamu.edu
Burl Carraway, Sustainable Forestry Department Head
979-458-6630, bcarraway@tfs.tamu.edu