Mon 21 May 2012
Our first full day of field work was both exhausting and fascinating. During the morning, we sampled meter-square plots to determine how moose and deer grazing affect trees in Harvard Forest. Highstead ecologist Ed Faison explained his research in this area. Then we counted species, took measurements, and noted any signs of grazing. In other words, “Eaten, or not eaten?”
As with any good science experiment, we had a control area. Within the control area, deer and moose are free to wander at will. Although none came near us, we saw evidence of lots of grazing. At least one moose also left some scat for us to observe.
We then took measurements in two experimental areas. One was fenced in to keep moose and deer out entirely. The other had an opening two feet up from the ground. Deer could scoot under, but moose were out of luck. The complete exclosure showed almost no signs of grazing. The partial exclosure had some evidence of grazing, but still less than the control area. We’ll wait for data analysis back at the lab to see if more specific conclusions can be drawn.
After lunch back at Shaner Hall, we headed out into the field again—this time to observe and examine evidence of the hemlock wooly adelgid and its impacts on the forest. Forest ecologist David Orwig described his research and the spread of this Asian pest across the Eastern seaboard. Then we counted wooly adelgid egg sacks on the undersides of marked leaves. The highest count I got on one branch was 317; yet another branch on the same tree had only 3.
Again, we measured the types, height, and diameters of trees in one-meter plots for a control area. Afterward, we took similar measurements in an experimental area where researchers had run cuts along the trunks of Eastern hemlocks. The resulting “girdling” mimicked the effects of the wooly adelgid by causing the trees to starve. While there were far fewer Eastern hemlocks in the experimental area, there was a surprising amount of understory growth going on. One of our one-meter plots had a whopping ten trees in it!
In addition to the sampling and protocols, we learned some important things about doing science in the field. For one thing, there’s lots of preparation and staging. Once our transects were finally laid out, doing observations and taking measurements took way more time than any of us anticipated. You have to do the work carefully and methodically. Working with a buddy helps—not just to share work but also to remind each other to follow each step exactly. Like many other professions, doing a good job means taking the time to do it carefully and to do it right.
The hike in and out of the hemlock forest followed a beautiful trail, complete with babbling brook. It’s scary to think that a pest like the wooly adelgid could kill those majestic trees and transform the area.
Scampering around the hills without trails was more challenging, especially when carrying tape measures, meter sticks, meter frames, and other paraphernalia. I did fall on my butt twice—fortunately suffering just a bruise. And the bugs were indeed biting—despite multiple applications of spray, long clothing, and so forth. Chris Neill and Rich McHorney say we’re just not used to the exertion. In any case, none of us felt the least bit guilty about the delicious blueberry pie at dinner.
All in all, though, it was a good day. I know I’ll sleep well tonight!