HETEROGENEITY OF FOREST CHARACTERISTICS IN PRIMARY AND SECONDARY FOREST STANDS ON THE THIRD CHICKASAW LOESS BLUFF, TENNESSEE

1998 ◽  
Vol 19 (1) ◽  
pp. 35-54 ◽  
Author(s):  
John A. Kupfer ◽  
Scott W. Kirsch
Keyword(s):  
Secondary Forest ◽  
Forest Stands ◽  
The Third

scholarly journals Woodland caribou and forestry in Northern Ontario, Canada

Rangifer ◽  
1986 ◽  
Vol 6 (2) ◽  
pp. 87 ◽  
Author(s):  
W. R. Darby ◽  
L. S. Duquette
Keyword(s):  
Boreal Forest ◽  
Timber Harvest ◽  
Woodland Caribou ◽  
Forest Stands ◽  
Migration Routes ◽  
Northern Ontario ◽  
Winter Range ◽  
The Third ◽  
Peripheral Portion ◽  
Deer Density

Expansion of logging in remote Ontario boreal forest requires mitigation of effects on woodland caribou. Three examples of caribou-forestry interaction are reviewed. In two, caribou were apparently displaced from peripheral portions of their winter range by logging. In the third, caribou disappeared when exposed to: logging in a central third of their winter range; increased deer density, and; a probable increase in predation. In all cases there is no evidence of human harvest. The literature plus experience in Ontario suggest the following mitigative techniques: protection of winter concentration areas, significant calving areas and traditional migration routes from logging; directing timber harvest to forest stands of least value to caribou; restricting disturbance to one large clearcut in a peripheral portion of range rather than dispersing it over a large portion as several small clearcuts; modified site preparation and regeneration, and; restricted road access. Research is required on the effect of forestry on caribou with and without mitigation, and on causes for effects observed.

Leaf gas exchange of trees in old-growth and young secondary forest stands in Sulawesi, Indonesia

Trees ◽  
2005 ◽  
Vol 20 (3) ◽  
pp. 278-285 ◽  
Author(s):  
Dirk Hölscher ◽  
Christoph Leuschner ◽  
Kerstin Bohman ◽  
Marc Hagemeier ◽  
Jana Juhrbandt ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Secondary Forest ◽  
Leaf Gas Exchange ◽  
Forest Stands ◽  
Old Growth

scholarly journals Soil fauna as an indicator of soil quality in forest stands, pasture and secondary forest

2012 ◽  
Vol 36 (5) ◽  
pp. 1407-1417 ◽  
Author(s):  
Felipe Vieira da Cunha Neto ◽  
Maria Elizabeth Fernandes Correia ◽  
Guilherme Henrique Almeida Pereira ◽  
Marcos Gervasio Pereira ◽  
Paulo Sérgio dos Santos Leles
Keyword(s):  
Soil Quality ◽  
Rainy Season ◽  
Soil Fauna ◽  
Secondary Forest ◽  
Diversity Index ◽  
Dry Season ◽  
Soil Invertebrate ◽  
Vegetation Types ◽  
Forest Stands ◽  
Environmental Variations

The interactions between soil invertebrates and environmental variations are relatively unknown in the assessment of soil quality. The objective of this study was to evaluate soil quality in areas with different soil management systems, based on soil fauna as indicator, in Além Paraíba, Minas Gerais, Brazil. The soil invertebrate community was sampled using pitfall traps, in the dry and rainy seasons, from areas with five vegetation types (acacia, mimosa, eucalyptus, pasture, and secondary forest). The abundance of organisms and the total and average richness, Shannon's diversity index, the Pielou uniformity index, and change index V were determined. The fauna was most abundant in the areas of secondary forest and mimosa plantations in the dry season (111.3 and 31.7 individuals per trap per day, respectively). In the rainy season, the abundance of organisms in the three vegetation types did not differ. The highest values of average and total richness were recorded in the secondary forest in the dry season and in the mimosa stand in the rainy season. Shannon's index ranged from 1.57 in areas with acacia and eucalyptus in the rainy season to 3.19 in the eucalyptus area in the dry season. The uniformity index was highest in forest stands (eucalyptus, acacia and mimosa) in the dry season, but higher in the rainy season in the pasture and secondary forest than in the forest stands. The change index V indicated that the percentage of extremely inhibited groups was lowest in the area with mimosa, both in the dry and rainy season (36 and 23 %, respectively). Of all forest stands, the mimosa area had the most abundant soil fauna.

scholarly journals Robust volumetric models for supporting the management of secondary forest stands in the Southern Brazilian Atlantic Forest

2018 ◽  
Vol 90 (4) ◽  
pp. 3729-3744 ◽  
Author(s):  
LAIO Z. OLIVEIRA ◽  
ALINE R. KLITZKE ◽  
ALFREDO C. FANTINI ◽  
HEITOR F. ULLER ◽  
JEAN CORREIA ◽  
...  
Keyword(s):  
Atlantic Forest ◽  
Secondary Forest ◽  
Brazilian Atlantic Forest ◽  
Forest Stands ◽  
Volumetric Models

Progress report on 21-cm observations at low latitude between longitudes (l 11) 0° and 66°

1967 ◽  
Vol 31 ◽  
pp. 177-179
Author(s):  
W. W. Shane
Keyword(s):  
Preliminary Report ◽  
Progress Report ◽  
Galactic Centre ◽  
Low Latitude ◽  
The Third ◽  
Introductory Lecture ◽  
Centre Region

In the course of several 21-cm observing programmes being carried out by the Leiden Observatory with the 25-meter telescope at Dwingeloo, a fairly complete, though inhomogeneous, survey of the regionl11= 0° to 66° at low galactic latitudes is becoming available. The essential data on this survey are presented in Table 1. Oort (1967) has given a preliminary report on the first and third investigations. The third is discussed briefly by Kerr in his introductory lecture on the galactic centre region (Paper 42). Burton (1966) has published provisional results of the fifth investigation, and I have discussed the sixth in Paper 19. All of the observations listed in the table have been completed, but we plan to extend investigation 3 to a much finer grid of positions.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

Monte Carlo Algorithms for Moments of Transition Arrays

1988 ◽  
Vol 102 ◽  
pp. 79-81
Author(s):  
A. Goldberg ◽  
S.D. Bloom
Keyword(s):  
Monte Carlo ◽  
State Vector ◽  
Basis Vector ◽  
Collective State ◽  
Dispersion Characteristics ◽  
Dipole Strength ◽  
The Third ◽  
Monte Carlo Algorithms ◽  
Third Moment ◽  
Very High

AbstractClosed expressions for the first, second, and (in some cases) the third moment of atomic transition arrays now exist. Recently a method has been developed for getting to very high moments (up to the 12th and beyond) in cases where a “collective” state-vector (i.e. a state-vector containing the entire electric dipole strength) can be created from each eigenstate in the parent configuration. Both of these approaches give exact results. Herein we describe astatistical(or Monte Carlo) approach which requires onlyonerepresentative state-vector |RV> for the entire parent manifold to get estimates of transition moments of high order. The representation is achieved through the random amplitudes associated with each basis vector making up |RV>. This also gives rise to the dispersion characterizing the method, which has been applied to a system (in the M shell) with≈250,000 lines where we have calculated up to the 5th moment. It turns out that the dispersion in the moments decreases with the size of the manifold, making its application to very big systems statistically advantageous. A discussion of the method and these dispersion characteristics will be presented.

Sign in / Sign up

Export Citation Format

Share Document