This is
definitely a novel and unexpected observation and surely informs us that
something cannot do its natural task at anywhere approaching the proper levels. Of course the headline is nonsense but it
also tells us that we may actually want to see something done.
Controlled burns
while enough moisture is in the ground is one option. Following that with an actual plowing of the
soil surely would bury most of the isotopes.
Then reforesting would protect the land thereafter and perhaps provide
wood someday that is essentially safe.
The clear take
home is that doing nothing is not necessarily the best option available today
and that needs to be clarified.
If deep plowing
can eliminate the isotope risk sufficiently then the forest itself can be
reopened to public use. That is a story
that we want to see.
Chernobyl
Nuclear Disaster Site Presents Renewed Threat
March 21, 2014
Martin Clemens
If you believe Hollywood, or its contemporary
bodies around the world, radiation poisoning holds the potential to create
anything from giant city-destroying lizards to a new race of humans, replete
with exotic mutations making them capable of miraculous feats in defence of
justice.
As you may have guessed, however, reality is seldom
that poetic.
The nuclear threat has long been in the forefront of
our minds. Since that first fateful detonation on the heavy weapons
proving grounds of New Mexico’s shadowy military installations in 1945, which
eventually culminated in the horrifically destructive nuclear attacks on the
Japanese cities of Nagasaki and Hiroshima during World War II, the full extent
of the danger posed by nuclear weapons has been notoriously well known to
virtually everyone on the planet. The fear inspired by the danger has
taken many forms over the decades since, and as Oscar Wilde opined “Life
imitates Art far more than Art imitates Life.”
Because of what Wilde called Life’s
self-conscious need to find expression, our silver screens and televisions have
long been showing us images of what happens when nuclear energy is unleashed in
unsafe ways. And today we are perhaps more aware of the dangers than any
other generation, but that doesn’t mean our understanding is complete.
Generally speaking, the public remains ignorant of just what radiation does to
living cells. We think we know, but that knowledge is infected by popular
culture and is coloured by our familiarity with monsters.
It would be difficult to find someone who isn’t
presently aware of the danger flowing across the Pacific Ocean toward the
continental US West Coast, from the crippled Japanese nuclear power plant at
what is now officially called the Fukushima Daiichi nuclear disaster
site. We are witnessing the worst nuclear disaster in our history, and
though there is plenty of blame to be handed out for the failings in how it’s
been dealt with since, Mother Nature is largely to blame for causing it in the
first place. Of course, with such a disaster comes much conspiracy
theorising and fear mongering, and few of the “facts” you’ll read about in this
case are truly factual.
Surprisingly, the general public has learned little
from our previous experience in this regard. The Chernobyl nuclear
disaster, much of the details of which admittedly remain shrouded in secrecy,
has offered us a unique view into the real effects of unrestrained exposure to
nuclear radiation on the environment. And thus far, in the intervening 31
years, no giant indestructible monsters have emerged from the tundra of eastern
Ukraine.
Scientists have recently found, however, that things
in the exclusion zones aren’t as peaceful as they appear from afar. In
fact, from a certain perspective, the hardest hit areas surrounding
Chernobyl are a ticking time bomb, capable of renewing the danger it once
presented. And the fuse on that bomb originates from the most
unlikely of sources: decomposers.
From a study recently published in the
journal Oecologia, it turns out that several scientists have found,
surprisingly, that leaf litter on the forest floor in the exclusion zones
isn’t decaying. Or, more accurately, that it isn’t decaying properly.[1]
Through an ingeniously simple experiment, scientists
from the University of South Carolina, Columbia found that the decomposition of
leaves from areas with different levels of radiation exposure decomposed at
strikingly different rates. They first became aware that there might be a
problem when they noticed, through observational studies of the area since
1991, an unusual accumulation of leaf litter on the forest floor. The
leaves that carpet the arboreal exclusion zones seem to form a blanket two to
three times thicker than that of non-radiated forests. At first glance
this seems to be because the leaves simply weren’t decaying, as would be
natural anywhere else. Of course, when you consider why that might be,
you must first understand the process of biological decay.
When a biological entity dies, whether that be a
tree, an animal or a human being, there is an army of microscopic creatures who
immediately go to work breaking down the structure of that entity. These
microbes, small insects and bacteria consume various elements of the fallen
entity, and release other elements back into the environment to be used by
other living entities for sustenance. The great circle of life, as it
were.
It’s long been known that wildlife in the exclusion
zones has suffered in the years since the disaster; animals are smaller, with
smaller brains, and they often sport physical deformities. The trees too,
have suffered. The Red Forest – so named because its pine trees have died
and turned red, but have yet to decay – offers
many examples of trees and other plants that grow at a severely stunted
rate. This suffering isn’t limited to creatures we can see though.
Fukushima Daiichi
It turns out that those ever-important insects,
microbes and bacteria are being affected as well, and that has a profound
effect on the natural recycling process normally present in biology. The
same mechanism that has affected other wildlife, has also affected the
prevalence and efficiency of the creatures that are normally responsible for consuming
dead biological material and recommitting it to the earth.
This has a dangerous effect on the overall
ecosystem. It reduces the amount of basic nutrients in the soil, so that
living plants struggle to survive, and it shields the soil and undergrowth from
much needed sunlight. Ultimately this process, altered as it is, may
result in unmeasured devastation to the biosphere in the area of
Chernobyl. But, surprisingly, this isn’t the most immediate danger.
Biologist Timothy Mousseau, the lead author of
the Oecologia paper, warns that the entire area of the Chernobyl
disaster zone is at risk of wildfire. Obviously, an increase in dry
leaf litter throughout the forests provides much fuel for a potential fire, but
the major concern is that such a fire could release the dangerous nuclear
isotopes currently trapped inside the trees and other plants, ejecting it back
into the atmosphere and re-infecting the exclusion zones, and even perhaps
increasing the affected area by a significant amount.
With all of this in mind, the Fukushima disaster
comes into focus. Obviously there is little risk of wildfire in the
Pacific Ocean, but those tiny creatures that are normally responsible for
recycling biological material are everywhere. They do their work in the
ocean just as much as the forest, but what doesn’t decay in the forest just
lays on the ground, what doesn’t decay in the ocean can end up almost
anywhere…bringing with it the poison of radiation.
The potential for these mechanisms to disseminate the
dangerous nuclear isotopes around the world is frightening, to say the least,
but letting fear cripple us serves no one. We must now attempt to
understand the reach of these disasters, and we must find ways to mitigate the
potential harm, not only to us, but to all life on the planet.
[1] Timothy
A. Mousseau, Gennadi Milinevsky, Jane Kenney-Hunt, Anders Pape
Møller. Highly reduced mass loss rates and increased litter layer in
radioactively contaminated areas. Oecologia by Springer, March 14, 2014
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