Treesearch

Presents technical documentation for development of an Ecological Classification System for the Manistee National Forest in northwest Lower Michigan, and suggests procedures applicable to other ecological land classification projects. Includes discussion of sampling design, field data collection, data summarization and analyses, development of classification units, and validation.

Presents a selection of papers from the "Urban Forestry" and "Ethnic Minorities and the Environment" paper sessions of the 4th North American Symposium on Society and Resource Management. Nine paper sessions organized by the North Central Forest Experiment Station-Chicago brought together 51 authors in 34 talks, 23 papers of which are included here.

Forest development following major disturbance is thought to follow a fairly repeatable temporal pattern. An initial cohort of trees establishes relatively rapidly (stand initiation), new establishment is precluded for an extended period (stem exclusion), and finally, new individuals again begin to establish, creating new age-classes in the forest understory (understory reinitiation), eventually leading to an uneven-aged condition. The current study was designed to assess the generality of this developmental paRern at the landscape level and gain insight into the possible mechanisms...

1. Studies have shown that differences in height growth rates are characteristic of tree species that differ in understory tolerance and relative successional status. Less-tolerant species have greater juvenile height growth rates than more-tolerant species and thus, in a mixed-species forest, the former gain an early competitive advantage after a stand-initiating disturbance. Species-level height stratification is the predicted outcome under this model. 2. Silvicultural evidence suggests that a species-level differential growth rate model is idealistic because height stratification among...

Gives guidelines for planting and tending poplar plantations as an agricultural crop, using intensive culture and 6- to 10- year rotations.

When landowners want to develop and maintain an uneven-aged tree structure in eastern hardwood stands, single-tree selection often is suggested as the only advisable, long-term partial regeneration harvest method. Single-tree selection is preferred because it provides a means for improving quality and controlling stocking of the residual stand necessary for sustained yield of desired products. Although studies have shown that single-tree selection is feasible where desirable shade-tolerant species can be regenerated, it is rarely applied because marking stands for harvest can be dificult...

Salamanders are abundant vertebrates in many forest ecosystems, and their annual biomass production can be important in forest food webs (Pough et al. 1987). Population densities of eastern redback salamanders (Plethodon cinereus) can exceed 2 individuals/m2 in deciduous forests of the United States (Heatwole 1962, Jaeger 1980). Eastern redback salamanders were the most abundant terrestrial vertebrate in northern hardwood forests on the Hubbard Brook Experimental Forest in New Hampshire (Burton and Likens 1975a). Salamander biomass may equal that of small mammals and be twice that of birds...

Presents silvicultural treatments for six major cover-type groups in New England to produce stand conditions that provide habitat opportunities for a wide range of wildlife species. Includes matrices for species occurrence and utilization by forested and nonforested habitats, habitat breadth and size class, and structural habitat features for the 338 wildlife species in New England. NOTE: This publication is no longer in print. It is available online only.

The estimation of biomass of tropical forests has continually been refined over the past decade, as the methodologies and the technology available for such estimation improved. Consequently, the uncertainty associated with estimates of carbon flux to the atmosphere from changes in land use has declined. In this paper, we review the efforts, primarily within our group, to refine the process of estimating forest biomass across the tropics. Initial estimates of global biomass resulted from the synthesis of ecological studies on small experimental plots. These studies did not sample from the...