In 1975, Leech introduced the problem of finding trees whose edges can be labeled with positive integers so that the sums of the edge labels between vertices is {1, 2, · · · , (n 2 )}, where n is the number of vertices. We refer to such trees as perfect distance trees. In a previous paper, this problem was generalized to graphs in general and in particular, forests. Here, we show that tK1,2 can...

Atmospheric deposition is an important pathway for moisture, nutrient, and pollutant exchange among the atmosphere, forest, and soils. Previous work has shown the importance of proximity to the forest edge to chemical fluxes in throughfall, but far less research has considered stemflow. This study examined the difference in acid neutralization capacity (ANC) of stemflow of nineteen Liriodendron...

Factors affecting the density and distribution of yellow-poplar regeneration after a single growing season prescribed fire were studied in mature upland oak stands in the southern Appalachian Mountains. In burned and unburned stands, density of one and two year old yellow-poplar seedlings was inventoried within 50 m from isolated yellow-poplar canopy seed trees in response to distance from seed...

Density and biomass of live trees >10 cm DBHandsaplings 1-9.9 cm DBH, coarse woody debris (LCG—diameter > 10 cm), fine woody debris (LCF — diameter 2.5-9.9 cm), and standing dead trees (>10 cm DBH) were quantified in 56permanent, 1-ha sample plots. These plots are located in four 1(4plots), three 10(12 plots) and two 100(14plots) forestfagments in size and nearby continuous forests (19 plots) a...

The importance of learning distance functions is gradually being acknowledged by the machine learning community, and different techniques are suggested that can successfully learn a strong distance function in many various contexts. Nevertheless the studies in the area are still rather fragmentary; they lack systematic analysis and focus on a limited circle of application domains. In this paper...

Although forest edges have been studied extensively as an important consequence of fragmentation, a unifying theory of edge influence has yet to be developed. Our objective was to take steps toward the development of such a theory by (1) synthesizing the current knowledge of patterns of forest structure and composition at anthropogenically created forest edges, (2) developing hypotheses about t...

BACKGROUND Fragmentation of native forests is a highly visible result of human land-use throughout the world. In this study, we evaluated the effects of landscape fragmentation and matrix features on the genetic diversity and structure of Oligoryzomys longicaudatus, the natural reservoir of Hantavirus in southern South America. We focused our work in the Valdivian Rainforest where human activit...

As we read through the medical literature, we are always looking for the “hottest” new advances (jumping right into the smoke/fire analogy thing): basic science that gives us new mechanistic insights, clinical trials that confirm or reject our so-called insights, major new diagnostic and therapeutic options, and breakthrough technology. We are a lot like forest rangers, sitting up on a platform...

The effect of isolation of forest habitat islands on the number of breeding woodland birds was studied in thirty-six woodlots, varying in size and differing in degree of isolation. Various isolation variables were calculated. Multiple regression analysis showed that, apart from patch area, the amount of woodland near the forest island and the distance t o an extensive forest area have significa...

The spatial distribution of very large trees in primary Amazon forest is extracted from a digital model of interferometric forest height by an approach of local maximum filtering. The spatial point patterns of very large trees are modeled by a series of Markov point process models. Spatial distribution is regular, and interaction decreases with distance; very large trees are shown to exert repu...