Treesearch

The principal findings from the five panels of the ninth forest survey of Florida are presented. In 2013, forests covered 17.3 million acres of the State, of which 15.4 million were classified as timberland. Longleaf-slash pine was the most common forest-type group and covered 5.3 million acres of the timberland. The second most common forest-type group was oak-gumcypress, which covered 3.0 million acres of timberland. Nonindustrial private forest ownerships controlled 66 percent of the State’s timberland. Softwood tree species accounted for 57 percent of the 20.8 billion cubic feet of...

We are conducting a large-scale, long-term climate change response experiment in an ombrotrophic peat bog in Minnesota to evaluate the effects of warming and elevated CO2 on ecosystem processes using empirical and modeling approaches. To better frame future assessments of peatland responses to climate change, we characterized and compared spatial vs. temporal variation in measured C cycle processes and their environmental drivers. We also conducted a sensitivity analysis of a peatland C model to identify how variation in ecosystem parameters contributes to model prediction uncertainty....

Fire effects and behavior models that forecast postfire tree mortality include the First Order Fire Effects Model (FOFEM), BehavePlus, and the Fire and Fuels Extension to the Forest Vegetation Simulator (FFE-FVS). Although these models are national in scope, the underlying equations driving the prediction of fire-related mo1iality were derived from data obtained from coniferous forests in the western United States. For tree species common to upland forests of the southeastern United States, quantitative models that predict mortality following prescribed fire are lacking. Consequently,...

This resource update provides a short overview of the status of forest resources in the U.S. Virgin Islands (St. Croix, St. John, and St. Thomas) based on the third forest inventory funded and conducted by the U.S. Forest Service, Forest Inventory and Analysis (FIA) program of the Southern Research Station and by the International Institute of Tropical Forestry. Data estimates are based on field data collected using the FIA annualized sample design for the measurement year 2014 with comparisons made to data collected in 2009 and 2004. The sample plot population presented here for the U.S....

The title compound (2,4,5-trihydroxy-3-methylacetophenone, 1) was isolated as chromophore from aged cellulosic pulps. The peculiar feature of the compound is its weak aromatic system that can be converted into nonaromatic (quinoid or cyclic aliphatic) tautomers, depending on the conditions and reaction partners. In alkaline media, the participation of quinoid canonic forms weakens aromaticity, whereas in neutral and acidic media, the strong hydrogen bond between the 2-hydroxyl group and the acetyl moiety plays an important role in favoring quinoid tautomers. As a result, compound 1, with...

A major knowledge gap exists in understanding dispersal potential of ground-dwelling arthropods, especially in forest ecosystems. Movement of the ground-dwelling arthropod community was quantified using a novel markcapture technique in which three different colored fluorescent powders in two separate mixtures were applied to the floor of a deciduous forest in concentric bands 3, 8, and 15 m from the center of 30 × 30 m experimental plots. The majority (67.1%) of ground-dwelling arthropods did not cross a colored band when fluorescents were mixed with protein powder in 2014. However, when...

As part of a comprehensive study to survey predators associated with hemlock woolly adelgid, Adelges tsugae Annand, 1928 in the Pacific Northwest (PNW), U.S.A. (Kohler et al. 2008), predators of balsam woolly adelgid, Adelges piceae (Ratzeburg, 1844) and Cooley spruce gall adelgid, Adelges cooleyi (Gillette, 1907) (all Hemiptera: Adelgidae) were sampled on nine dates from June 2005 to October 2006 on a small number of trees. Samples were collected every 6–8 weeks. Predators were collected from two A. piceae infested grand fir, Abies grandis (Douglas ex David Don) Lindley, and one A....

The invasive emerald ash borer (Agrilus planipennis) (EAB) is causing widespread ash (Fraxinus spp.) mortality in 25 U.S. states and two Canadian provinces. We investigated the impact of EAB on coarse woody debris (CWD) volume across 24 sites in western and central Ohio, USA, representing a chronosequence of ash mortality, quantified by the year ash mortality reached 25% (Year25%Dead). CWD volume averaged 60.36 m3/ha, and was positively associated with total (live plus dead) ash basal area (BA), but was not greater in sites where ash death occurred earlier. For the volume of CWD in the...

Recent phylogenetic, phylogeographic, and morphometric studies have established the genetic affinities of the American marten (Martes americana), Pacific marten (M. caurina), European pine marten (M. martes), stone (beech, house) marten (M. foina), Japanese marten (M. melampus), yellow-throated marten (M. flavigula), Nilgiri marten (M, gwatkinsil), sable (M. zibellina), fisher (Pekania pennanti), wolverine (Gulo gulo), and tayra (Eira barbara). In this chapter, we evaluate the extent to which species in the Martes Complex share ecological adaptations and biological traits, and how such...

Financial incentives provided by State property tax programs are a means of promoting ecosystem services from private forest land. Identified by this 50-State 2015 review, categories of ecosystem services frequently promoted by such programs are open space and scenic resources, conservation of soils and wetlands, protection and supply of fish and wildlife, protection and supply of water, production of timber and fiber products, recreational uses and resource preservation, and integrity and sustainability of forests. Focusing on the promotion of these services, preferential property...