Treesearch

Adequate diversity and abundance of native seed for large-scale grassland restorations often require commercially produced seed from distant sources. However, as sourcing distance increases, the likelihood of inadvertent introduction of multiple novel, non-native weed species as seed contaminants also increases. We created a model to determine an "optimal maximum distance" that would maximize availability of native prairie seed from commercial sources while minimizing the risk of novel invasive weeds via contamination. The model focused on the central portion of the Level II temperate...

Storms are the most significant disturbance events in temperate forests. Forests impacted by nitrogen deposition may face more severe storm damage as changes in soil and wood chemistry impact tree growth allocation, wood strength, and species composition. To examine these potential effects of nitrogen deposition, we measured tree damage from a windstorm in an aggrading forest that is part of a nitrogen fertilization experiment. We discovered that within the nitrogen fertilization treatment area there was significantly more basal area and stems damaged when compared to the reference...

Water table fluctuations in peatlands are closely coupled with the local climate setting and drive critical ecosystem processes such as nutrient cycling. In Minnesota, USA, peatlands cover ten percent of the surface area, approximately 2.5 million hectares, some of which are actively managed for forest products. To explore the relationship between peatland water tables and precipitation, long-term data (1961 to 2019) were used from the Marcell Experimental Forest in northern Minnesota. Starting in 1961, water table data from seven peatlands, including two types of peatlands (bogs and...

Increasingly, land managers have attempted to use extreme prescribed fire as a method to address woody plant encroachment in savanna ecosystems. The effect that these fires have on herbaceous vegetation is poorly understood. We experimentally examined immediate (<24 hr) bud response of two dominant graminoids, a C3 caespitose grass, Nassella leucotricha, and a C4 stoloniferous grass, Hilaria belangeri, following fires of varying energy (J/m2) in a semiarid savanna in the Edwards Plateau ecoregion of Texas. Treatments included high-and low-energy fires determined by contrasting fuel loading...

A pine barrens is an open, fire-dependent ecological community once prevalent in sandy areas of northern Wisconsin (USA). Efforts to restore pine barrens on public lands have been hampered in part because their character does not conform to many people's ideals of Northwoods forest scenery, challenging land managers on how to balance social and ecological goals. We studied the manager-relevant attributes of a pine barrens restoration site to predict nearby landowners' landscape preferences and to ascertain whether their preferences differed. We designed a discrete choice experiment where...

Many cities have addressed urban population shrinkage by adopting strategies to re-purpose vacant lots in ways that leave them beautified and groomed. This study investigates leisure behavior resulting in beautified and groomed vacant lots that resist dominant discourses – referred to as green leisure. We applied a mixed-methods research design with property owners who purchased vacant lots through the Chicago Large Lot Program. Our focus group findings (n=25) indicated that participants framed their activities as resistance tied to (a) vacant lot beautification, (b) providing places to...

In many cities, high land vacancy has contributed to negative outcomes including visual blight, loss of sense of community and safety, and high crime rates. Although studies show that vacant lot greening programs reduce crime rates in high-vacancy areas, little is known about the impacts of resident-owner-based vacant lot repurposing initiatives on crime. We evaluated the impacts of one such initiative, the Chicago Large Lot Program, on crime reduction. Through this program, qualified property owners could purchase one or two nearby city-owned vacant lots for one dollar each. Focusing on...

This study seeks to advance the knowledge about the effect of the Sacramento Soil Moisture counting Model (SAC-SMA) a priori parameters on calibration. We investigated the catchment characteristics where calibration is most affected by the limitations in the a priori parameters and we studied the effect on the modeled processes. The a priori SAC-SMA model parameters were determined from soil-derived physical expressions that make use of the soil’s physical properties. The study employed 63 catchments from the eastern United States (US). The model calibration employed the Shuffle-Complex...

*Background and aims: Restoring healthy ecosystem depends on recovering not only biodiversity, but also ecosystem processes and functionality. We investigated the effects of tree community parameters and site abiotic conditions on nutrient cycling in restored forests. *Methods: We assessed litter production and nutrient inputs in five 16-year old restored forests established using different restoration methods and species combinations, i.e. unplanted control (natural regeneration), direct seeding, agroforestry, mixed commercial species plantation (commercial mix), and high-diversity...

Rapid Ohia Death is a major concern for the viability of ohia (Metrosideros polymorpha) in Hawaii and has led to restrictions on log movement. The potential for using disodium octaborate tetrahydrate (DOT) and didecyl dimethyl ammonium chloride (DDAC) dip diffusion treatments to control the two causal fungi (Ceratocystis lukuohia and Ceratocystis huliohia) was investigated. A 10 percent boric acid equivalent dip diffusion treatment killed the pathogens in 0.5-cm-thick disks obtained from 4.0- to 5.0-cm-diameter limbs of naturally colonized trees. DOT tended to diffuse more consistently in...