Treesearch

This research evaluated the influence of different washing treatments (i.e., tap water, ozone, microbubbles, and ozone combined with microbubbles) on post-harvest decay of chestnuts (Castanea crenata ‘Tsukuba’) during storage. Overall, treatments with ozone and microbubbles significantly reduced the decay frequency and the associated microbial populations (aerobic bacteria, mold/filamentous fungi, and yeasts) during post-harvest storage compared with the traditional practice (tap water washing). Enhancing the efficacy of chestnut washing treatments will contribute to the improved storage...

The impact of roads on the flora and fauna of Neotropical rainforest is perhaps the single biggest driver of habitat modification and population declines in these ecosystems. We investigated the road-edge effect of a low-use dirt road on amphibian and reptile abundance, diversity, and composition within adjacent lowland Amazonian rainforest at San José de Payamino, Ecuador. The road has been closed to vehicle traffic since its construction in 2010. Thus, effects from vehicle mortality, vehicle-related pollution, and road noise were not confounding factors. Herpetofauna were surveyed using...

In forest stands, there is always a background of growth, senescence, and death of individual trees. There also is always some type of disturbance, from simple and constant events, such as wind, to more intensive and dynamic events, like a timber harvest. Hardwood stands are composed of multiple species, and these species respond differently to disturbance, depending on the age and size of each individual. So, when a stand is disturbed, you must consider not only the species but other factors as well. Every time a hardwood stand is disturbed (either via commercial harvest or other intermedi...

This resource update provides an overview of forest resources in Iowa based on inventories conducted by the U.S. Forest Service, Forest Inventory and Analysis (FIA) program at the Northern Research Station in cooperation with the Iowa Department of Natural Resources. Estimates are based on field data collected using the FIA annualized sample design and are updated yearly. For annual inventory years in Iowa 1999-2013, the cycle length was equal to 5 years. In 2014, NRS-FIA changed to a 7-year inventory cycle, wherein 1/7th (14.3 percent) of the plots will be measured annually until 2020.This...

Enabled by humans’ ever-expanding trade and travel networks, invasive alien species are crossing borders worldwide at alarming rates (Haack 2006; Haack and Rabaglia 2013; Hulme 2009; Kaluza et al. 2010; Koch et al. 2011; Liebhold et al. 2006; Lodge et al. 2006; Perrings et al. 2005; Pyšek and Richardson 2010; Tatem 2009; Westphal et al. 2008). An astonishing 50,000+ non-native species have been introduced into the U.S. either accidentally or purposefully, and approximately 4,500 of those introductions have been arthropods (Pimentel et al. 2005). Furthermore, new establishments of non-native...

In July 2014, mycelial fans (isolates CO104F, CO106F, and CO108F) of Armillaria sp. were collected from forest trees in Colorado. These isolates were all identified as A. sinapina based on a somatic pairing test against 18 tester isolates representing six North American Armillaria spp. and nucleotide sequences of the translation elongation factor 1alpha (tef-1alpha; GenBank Accession Nos. KT327065, KT327066, and KT327067). Based on nine replications of somatic incompatibility tests, all isolates showed high intraspecific compatibility (colorless antagonism) with three A. sinapina tester...

Understory pine and hardwood regeneration in the Ozark and Ouachita National Forests were measured in 1995 for the first time following thinning and hardwood control at plot establishment 1985-87. Red maple (Acer rubrum), shortleaf pine and flowering dogwood (Cornus florida) were the most frequently recorded species. Understory shortleaf pine stems have declined consistently since 1995. The binomial logistic regression model showed that site index and overstory shortleaf pine basal area were negatively related to shortleaf pine regeneration (P<0.05). Overstory shortleaf pine thinning may...

A semi parametric cox proportion hazard model is preferred when censored data and survival time information is available (Kleinbaum and Klein 1996; Alison 2010). Censored data are observations that have incomplete information related to survival time or event time of interest. In repeated forest measurements, usually observations are either right censored or interval censored. Interval censoring occurs if the exact year of tree death is unknown, since measurement periods are typically longer than one year. Right censoring occurs if tree has not died at the end of the study.

Faced with the challenges of maintaining customer-specified objectives and meeting deadlines, forest land managers must integrate various mensurational information sources for developing management scenarios. Cost efficient measures are a consideration to save both time and money for a client. While inventory data collection is time and money intensive, data processing does not have to be costly. This paper presents an open access, non-fee website that will host several common growth and yield models. The growth and yield web-based system was developed by scientists at Mississippi State...

In 2001, the New York City Department of Parks & Recreation (NYC Parks) Natural Resources Group created the Forever Wild Program to protect nearly 9,000 acres of forests, wetlands, and meadows citywide. Although these areas were set aside over a decade ago, we have little systematic evidence about how park visitors view, use, and value parks with these resources. In 2013, an interdisciplinary team of scientists and natural resource managers at the New York City Urban Field Station embarked on a study to investigate the social dimensions and value of public green space in New York City....