Clearing for the Assabet River Rail Trail involved cutting hundreds of trees, some more than a foot in diameter. This photo of section behind Cumberland Farms gas station. |
Instead of “Sleepless in Seattle,” how about “Treeless in
Maynard?” From either Google’s satellite
map or casual driving around, there is a first-glance sense that Maynard is
adequately treed, but arborist history tells a different and continually
changing story. The de-treeing of our town is a consequence of deliberate
deforestation, species-specific diseases, invasive insect species, invasive
plant species, uncompensated storm damage, deferred maintenance, and even the
consequences of the return of deer and beaver to eastern Massachusetts.
The colonists’ approach to a wooded New England was “The
first thing we do, let's cut down all the trees." The resultant landscape
was farmland and pasture. Massachusetts gradually became rewooded after the
mid-nineteenth century as farms were abandoned, people either shifted toward
factory jobs in cities or relocated to the fertile, flatter lands of western
Pennsylvania and Ohio. Demand for wood for fuel was superseded by coal and oil.
Abandoned farm land reforested naturally, but a conscious
decision was necessary for industrial era towns – trees or no trees? In that
era of people not having cars or air conditioning, trees provided shade for
sidewalks and homes. There are studies showing that in urban and suburban
environments, more trees per square mile leads to cooler, cleaner air, happier
people, and even lower medical expenses for treatment of physical and mental
ailments.
Two tree diseases caused dramatic changes to public-space
plantings. Chestnut blight, an airborne fungus accidentally introduced to the
United States around 1904, killed as estimated three billion trees from
Mississippi to Maine within 50 years. Subsequently, many cities, towns and
college campuses were planted with rows of elm trees – note streets named Elm
or Elmwood – but in 1928 a shipment of logs from the Netherlands that was
infested with elm bark beetles led to a fungal plague that killed between 75
and 100 million trees.
Hurricane damage, Sept 1938 |
Invasive insect species had a massive impact. The caterpillars
of Gypsy, Brown-tail and Winter moths (plus native tent caterpillars) can
completely defoliate trees. If this happens for several years in a row the
trees become weakened and suspect to disease. The larvae of Emerald Ash Borer
and Asian Longhorned beetles have a more directly fatal impact on ash and other
deciduous trees, as does the Hemlock Woolly Adelgid on hemlocks. The impact of
invasive plant species is subtle, but still considerable. Oriental bittersweet
vines grow into the tops of mature trees, overshadowing the trees’ leaves and
breaking branches with weight, until the trees die. Japanese Barberry and
Garlic Mustard release chemicals into the soil that hinder the growth of other
plants.
Eastern Massachusetts suffered extensive tree damage from a
September 1938 hurricane. Maynard’s annual report for that year mentions 900
trees blown down in streets, parks, cemeteries and on houses, and an additional
800 trees severely damaged. The report goes on to mention that 780 trees were
planted to replace what was lost. Closer to now, creating the Assabet River
Rail Trail caused the cutting of more than 600 trees four or more inches in
diameter, with replacement plantings of smaller trees perhaps one-fifth that
number.
Hurricane damage, Sept 1938. Photos courtesy of Maynard Historical Society. Click to enlarge. |
Deer browse on small trees. The result is a forest of mature
and old trees, but no replacement trees in the understory. Beaver have returned
to the Assabet River and are killing many of the trees bordering the river and
millpond.
Lastly, the Town of Maynard will need to decide how to
manage what had once been scores of trees planted along Nason and Main Streets
and other public places. Most of these are either long-dead, stumps cut flush
with the ground, or standing dead, or standing sickly. Consequently, the
streets are becoming shade-free zones, the sidewalks punctuated by squares of
dirt from which nothing is growing.
Not in article: Norway maple was a popular urban and suburban tree choice in the second half of the twentieth century, but was designated by Commonwealth of Massachusetts as an invasive species in 2006, sales banned. Removal of existing trees not required.