I have to call myself out. Earlier I had professed to being a former coniferphile. That was, of course, silly. I like coniferous trees very much. Half of my business is made from this lovely branch of the tree family. This introduction is a lead in to say that this blog will be quieter while my gig in Mongolia continues. A team of us are off to Mongolia to recover an millennia or two of xylemite. My focus in August and September will be on the development of a tasty and long record of drought from central Mongolia. You can follow these adventures here. Before I make that switch, I wanted to make a brief update on a good, busy summer.
Update #1: I caught a tweet that indicated that angiosperms have the ability to adapt a wee bit quicker than conifers. Looking forward to that line of work!
Update #2 – This summer our lab hosted two Lamont Summer Interns. Jackie Testani worked with me and Dario Martin-Benito on understanding the long-term forest dynamics of the Palmaghatt Ravine in the mid-Hudson Valley, NY. When first viewed from the west, the Palmaghatt made me think that if I re-labeled the image below as Borneo, folks would ooh and ahh. The light-green pyramidal crowns of the tuliptrees (Liriodendron tulipifera) gave me the feeling many people have about tropical forests: luscious, wild forest.
Jackie has completed some impressive work this summer. A history major with an interest in medical sciences and Africa, she has taken to tree rings like nobody’s business. Most impressively, Jackie slew the zombie maples. See, a small, but not insignificant proportion red maple in the northeastern US tend to not produce growth rings in the decade or two prior to coring. This on top of red maple’s diffuse-porous rings makes it difficult to work. The cause for the zombie’ness is not yet so clear. But, it happens. Often. Jackie’s work matches an independent collection of red maple from the 1980s. Both show some trees missing 5-6 rings in the decade or two prior to coring. This has important implications for all kinds of tree-ring based research.
And, to finish this update (as we approach the Christmas season), we also found a porcupine in a birch tree.
Update #3 – We has also gotten some preliminary dates on the samples from Turkey. Dr. Nesibe Kose and her students have done a nice job in making their way through the collection. A spruce and fir tree is more than 200 years old. The limited beech forests that we could reach during fieldwork are wicked-fast growers and not too old – 100-180 years old. The oaks look to date to the mid to late-1700s. The coolest thing is that the umbrella pine have a large age range, from ~100 years to >210 years of age. So, these ages suggest this stand was not planted by Russians in the late-1800s. However, when in Eurasia, you can never be too sure this stand was not planted at some point in time. If these ages hold, it suggests that, regardless of their origin, they comprise a functioning stand with little stand-scale disturbance.
Update #4 – I will use this blog to call attention to some neat pieces of the literature in broadleaf forests. Bob Booth and colleagues have a 2012 paper indicating that changes in moisture availability in the Great Lakes region, a relatively humid region, plays a strong role in forest dynamics. Particularly, changes in moisture lead to a long-term decline in American beech. There is also some indication that snowpack is beneficial to sugar maple. You like maple syrup? If so, let’s hope that the snowless 2012-2013 Winter does not become a climatic habit.
Update #5 – Speaking of drought, the drought in the southern US has crept its way into the northeast Maybe The South will rise again? ;). The US drought monitor for July 24, 2012 shows drought across much of the US. Here in NY, the drought came fast and seems exacerbated with the successive heat waves this summer. This year’s growing-season drought is in stark contrast to 2011, one of the wetter years since 1531 (a paper just accepted in the Journal of Climate). If you are lucky to live in the range of tuliptree, however, you do not need an internet connection to know the severity of drought in your area. Go seek the tulip tree. Being a drought-deciduous tree, some of its leaves yellow and fall during drought. It almost seems like a 10% increase in the ratio of yellow leaves to green leaves equals one unit of the Palmer Drought Severity Index.
Finally, update #6 – I just came across a paper by the White Lab suggesting that southern Magnolia (Magnolia grandiflora), or bull bay, is becoming naturalized to the north and west of its range (The South will rise again, II?). The implications in the paper is that warmer winters are allowing this iconic Tree of the South to expand its range. If you find yourself near Auburn, AL, find your way to the Bartram Trail. It will take you through some spectacular forest-grown southern Magnolia. They look much different than the ones you see in people’s yards. When in this form, it is one of my favorite trees.