I’m going to start focusing more on science topics here, as time allows. I’ll start by focusing for a while on some forest ecology topics that I’ve been working on, and/or which are closely related to them.
I’m working on some forest dynamics questions involving historical, landscape scale forest conditions and associated fire patterns. I just got done assembling a tree demography database of about 130,000 trees collected in about 1700 plots, in the early 20th century, on the Eldorado and Stanislaus National Forests (ENF, SNF), the two National Forests that occupy the mid- to upper-elevations on the relatively gradual western slope of the central Sierra Nevada. The data were collected primarily between 1911 and 1923 as censuses of large plots (by today’s standards, each ~2 or 4 acres) as part of the first USFS timber inventories, when it was still trying to figure out just what it had on its hands, and how it would manage it over time. An enormous amount of work was involved in this effort, but only a small part of these data has apparently survived.
The data are “demographic” in that the diameter and taxon were recorded for most trees, making them useful for a number of analytical purposes in landscape, community and population ecology. They come from two datasets that I discovered between 1997 and 2001, one in the ENF headquarters building, and the other in the National Archives facility in San Bruno CA. For each, I photocopied the data at that time, and had some of it entered into a database, hoping that I would eventually get time to analyze them. For the ENF data, this was a fortunate decision, because the ENF, as I later learned, has managed in the mean time to lose the entire data set, most likely along with a bunch of other valuable stuff that was in the office housing it. I thus now have the only known backup. Anyway, that time finally came, but the data were in such a mess that I first had to spend about three months checking and cleaning them before they could be analyzed. The data will soon be submitted as a data paper to the journal Ecology, it being one of the very few journals that has adopted this new paper format. In a data paper, one simply presents and describes a data set deemed to be of value to the general scientific community. There is in fact a further mountain of data and other information beyond these, but whether they’ll ever see the light of publication is uncertain.
We, and others, are interested in these data for estimating landscape scale forest conditions before they were heavily altered by humans via changed natural fire regimes, logging, and grazing (primarily). These changes began in earnest after about 1850, and have generally increased with time. This knowledge can help inform some important current questions involving forest restoration and general ecosystem stability, including fire and hydrologic regimes, timber production potential, biological diversity, and some spin off topics like carbon dynamics. They can directly address some claims that have been made recently regarding the pre-settlement fire regimes in California and elsewhere, in certain papers.
The data assembly was much slower and more aggravating than expected–I won’t go into it but I’ll never do it again–but the analysis is, and will be, very interesting for quite some time, as much can be done with it. Some of the summary or explanatory documentation associated with the data is entirely fascinating, as is some of the other old literature and data that I’ve been reading over as part of the project. In fact I’m easily distracted into reading more of it than is often strictly necessary, but so doing has reminded me that a qualitative, verbal description can be of much greater value than actual data, scientific situation depending. Possibly the most interesting and important aspect to this is the degree to which really important information has been either lost, completely forgotten about, or never discovered to begin with. This is not trivial–I’m talking about a really large amount of detailed data and extensive, detailed summary documentation. Early views and discussions regarding fire and forest management, and the course these should take in CA, are extensive and very revealing, as we now look back 100 years later on the effects of important decisions made then. There are also lessons in federal archiving and record keeping.
I’ll be posting various things as time allows, including discussions of methods and approaches in this type of research. I’m also applying for a grant to cover the cost of free pizza at the end, although to be honest I’ve not had great success on same in the past. You might be surprised at the application numbers and success rates on that kind of thing.