Historical trends in tree-ring growth and chemistry across an air-quality gradient in Wisconsin

1989 ◽  
Vol 19 (1) ◽  
pp. 113-121 ◽  
Author(s):  
L. E. Frelich ◽  
J. G. Bockheim ◽  
J. E. Leide
Keyword(s):  
Chemical Composition ◽  
Sugar Maple ◽  
Basal Area ◽  
Growth Efficiency ◽  
Basal Area Increment ◽  
Past Century ◽  
White Pine ◽  
The Past ◽  
Age Related ◽  
The 1960S

Basal-area increment and chemical composition of xylem wood were measured in three old-growth (ca. 75–100 years) white pine (Pinusstrobus L.) and three sugar maple (Acersaccharum) Marsh.) stands across a pH and SO4 gradient in precipitation in Wisconsin. In 1986 the volume-weighted mean pH and SO4 content of precipitation ranged from 4.5 to 5.0 and from 21 to 11 kg • ha−1, respectively, from southeastern to northwestern Wisconsin. With one exception (a white pine site at Point Beach in eastern Wisconsin), basal-area increment increased from the 1890s until the 1950s (sugar maple) or 1970s (white pine), then levelled off. Growth efficiency, estimated as the ratio of basal area to exposed crown area or crown volume for the 1980–1985 period, was similar for sugar maple across the gradient; however, growth efficiency of white pine was lower at Point Beach than at the two northern Wisconsin sites. Lead concentrations in xylem wood of both species have increased with time, except at Crotte Creek in northwestern Wisconsin, and Pb concentrations in xylem wood of both species were significantly greater in southeastern than in northwestern Wisconsin. Sulfur concentrations in xylem wood of white pine have increased since the 1960s at Point Beach and at one site in north central Wisconsin; S concentrations are significantly greater for both species in southeastern than in northern Wisconsin. Concentrations of Ca, Mg, and K in xylem wood of sugar maple have decreased over the past century. Whereas xylem wood concentrations of Mn and Zn generally show no age-related trends, Fe and P concentrations have increased markedly at all sites, particularly during the past decade. Although additional research is needed to determine the potential of dendrochemistry in evaluating the consequences of environmental pollution, the age- and site-related trends in chemical composition of xylem wood of white pine and sugar maple appear to be related to vehicular emissions (Pb), air pollution (S), migration along ray paths during conversion of sapwood into heartwood (P, Fe, Ca, K, Mg), and possibly reallocation of nutrients from the labile soil pool to perennial tree tissues during stand development (Ca, K, Mg).

Growth trends in 10 species of trees in New England, 1950–1980

1988 ◽  
Vol 18 (10) ◽  
pp. 1337-1340 ◽  
Author(s):  
J. W. Hornbeck ◽  
R. B. Smith ◽  
C. A. Federer
Keyword(s):  
New England ◽  
Growth Rates ◽  
Sugar Maple ◽  
Basal Area ◽  
Forest Resources ◽  
Red Spruce ◽  
The Other ◽  
Balsam Fir ◽  
White Pine ◽  
The 1960S

Tree-ring measurements on increment cores collected from more than 5000 trees during a periodic survey of forest resources in New England indicate trends in regional basal-area increment by species for the period 1950–1980. Two species, red spruce and balsam fir, have had generally decreasing growth rates since the 1960s. Normal aging of the low-elevation, even-aged spruce–fir forest is a probable cause. Eight other species, including sugar maple, had constant or increasing growth throughout the period. White pine had considerably higher growth rates than the other species.

Religious Non-Affiliation

2021 ◽  
pp. 172-193
Author(s):  
William V. Trollinger
Keyword(s):  
Republican Party ◽  
Christian Right ◽  
Past Century ◽  
Right Wing ◽  
Cultural Changes ◽  
Conservative Politics ◽  
The Past ◽  
1960S And 1970S ◽  
The 1960S ◽  
Political Success

For the past century, the bulk of white evangelicalism has been tightly linked to very conservative politics. But in response to social and cultural changes in the 1960s and 1970s, conservative white evangelicalism organized itself into the Christian Right, in the process attaching itself to and making itself indispensable to the Republican Party. While the Christian Right has enjoyed significant political success, its fusion of evangelicalism/Christianity with right-wing politics—which includes white nationalism, hostility to immigrants, unfettered capitalism, and intense homophobia—has driven many Americans (particularly, young Americans) to disaffiliate from religion altogether. In fact, the quantitative and qualitative evidence make it clear that the Christian Right has been a (perhaps the) primary reason for the remarkable rise of the religious “nones” in the past three decades. More than this, the Christian Right is, in itself, a sign of secularization.

From Gilles de la Tourette's Disease to Tourette Syndrome: A History

CNS Spectrums ◽  
1999 ◽  
Vol 4 (2) ◽  
pp. 24-35 ◽  
Author(s):  
Howard I. Kushner
Keyword(s):  
Basal Ganglia ◽  
Tourette Syndrome ◽  
Past Century ◽  
Organic Substrates ◽  
The Past ◽  
Symptom Complex ◽  
Initial Description ◽  
Pharmacologic Treatments ◽  
The 1960S

AbstractOver the past century researchers have attributed the symptoms that today are labeled as Tourette syndrome to various etiologies. Although most investigators have accepted Gilles de la Tourette's initial description of a symptom complex of tics and involuntary vocalizations, most have rejected his claim that “tic disease” resulted from hereditary degeneration. Subsequent investigators have offered an array of contradictory etiological explanations including viewing these symptoms as a subset of choreas, a result of insufficient inhibition, a failure to control infantile habits, a sequel to encephalitis and other infections, or the result of unconscious psychosexual childhood conflict. With the advent of effective pharmacologic treatments in the 1960s, psychiatrists, often urged on by the parents of afflicted children, began to insist that the disorder resulted from organic factors, most likely connected to transmission of the neurotransmitter dopamine and signaling in the basal ganglia. Since the 1970s, research has focused on a variety of possible organic substrates, but disputes over which symptoms to include in the syndrome's phenotype continue to constrain efforts to locate its etiology.

The View from the Top: A Century of PS Presidents' Perspectives on the Paleontological Society and Paleontology

2008 ◽  
Vol 14 ◽  
pp. 1-15
Author(s):  
Patricia H. Kelley
Keyword(s):  
Continental Drift ◽  
Early Years ◽  
Second Century ◽  
Past Century ◽  
Science And Society ◽  
Mccarthy Era ◽  
The Past ◽  
Paleontological Society ◽  
Sister Organization ◽  
The 1960S

The Paleontological Society was founded in 1908, as a section of the Geological Society of America, for the purpose of promoting the science of paleontology. Although disciplinarily inclusive, our founders were an elitist, demographically limited group. Constitutional revisions over the past century trace the evolution of the PS, including increased democratization (with a setback during the McCarthy Era, but accelerating following the turmoil of society as a whole during the 1960s), internationalization, independence from the GSA and our sister organization SEPM, and broadening of our activities and concerns. Comments by Paleontological Society presidents, in their presidential addresses and/or a survey I conducted, reinforce these conclusions. In addition, the presidential addresses demonstrate the shifting concerns and interests of paleontologists over the past century: emphasis on stratigraphic paleontology during the early years of the Society; avoidance of the topic of evolution during the antievolution movement of the 1920s – 1950s; lack of participation in the debates over continental drift; development of paleobiology. Many presidents focused on the identity of paleontology, either praising our potential for contributions to science and society or bemoaning our status and recommending remedies for our situation. Despite some predictions of impending extinction of paleontology and the PS, both our Society and our field remain vigorous as we begin our second century.

Intertree competition in uneven-aged ponderosa pine stands

2003 ◽  
Vol 33 (9) ◽  
pp. 1719-1726 ◽  
Author(s):  
C W Woodall ◽  
C E Fiedler ◽  
K S Milner
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Basal Area ◽  
Growth Efficiency ◽  
Tree Size ◽  
Basal Area Increment ◽  
Diameter Class ◽  
Individual Tree ◽  
Sapwood Area ◽  
Competition Indices

Intertree competition indices and effects were examined in 14 uneven-aged ponderosa pine (Pinus ponderosa var. scopulorum Engelm.) stands in eastern Montana. Location, height, diameter at breast height (DBH), basal area increment, crown ratio, and sapwood area were determined for each tree (DBH >3.8 cm) on one stem-mapped plot (0.2-0.4 ha) in each sample stand. Based on tree locations, various competition indices were derived for each sample tree and correlated with its growth efficiency by diameter class. In addition, trends in individual tree attributes by diameter class and level of surrounding competition were determined. For trees with a DBH <10 cm, growth efficiency was most strongly correlated with the sum of surrounding tree heights within 10.6 m. The index most highly correlated for larger trees was the sum of surrounding basal area within 6.1 m. Regardless of tree size, individual tree growth efficiency, basal area increment, and crown ratio all decreased under increasing levels of competition, with the effect more pronounced in smaller trees. These results suggest that individual trees in uneven-aged stands experience competition from differing sources at varying scales based on their size, with response to competition diminishing as tree size increases.

Effects of chronic ammonium sulfate treatment on basal area increment in red spruce and sugar maple at the Bear Brook Watershed in Maine

2003 ◽  
Vol 33 (5) ◽  
pp. 862-869 ◽  
Author(s):  
Jose Alexander Elvir ◽  
G Bruce Wiersma ◽  
Alan S White ◽  
Ivan J Fernandez
Keyword(s):  
Ammonium Sulfate ◽  
Acer Saccharum ◽  
Sugar Maple ◽  
Basal Area ◽  
Red Spruce ◽  
Basal Area Increment ◽  
Internal Stresses ◽  
Ice Storm ◽  
Growth Responses ◽  
Growth Allocation

Responses in basal area increment (BAI) of sugar maple (Acer saccharum Marsh.) and red spruce (Picea rubens Sarg.) to chronic ammonium sulfate ((NH4)2SO4) treatment were examined at the Bear Brook Watershed in Maine. The Bear Brook Watershed is a pair-watershed forest ecosystem study with West Bear watershed treated with (NH4)2SO4 at a rate of 1800 equiv.·ha–1·year–1 since 1989, while East Bear watershed serves as a reference. Following 10 years of treatment, BAI was significantly higher for sugar maple trees growing in the treated watershed, with yearly increases relative to the reference watershed ranging from 13% in 1999 to 104% in 1996. The increase in sugar maple radial growth was attributed to a fertilization effect from the (NH4)2SO4 treatment. A reduction in BAI in sugar maple growing in the treated watershed observed in 1998 and 1999 was attributed to internal stresses and growth allocation to crown recovery after the severe 1998 ice storm. Red spruce showed no BAI growth responses to the treatment. Lower foliar Mg and Ca concentrations in red spruce in the treated watershed and lower soil responses to N enrichment in treated softwood stands compared with treated hardwood stands could explain the lack of BAI response in red spruce.

ANTECEDENTES EN ESPAÑA DE LA CRIMINOLOGÍA POSITIVA MODERNA Y DE LA CRIMINOLOGÍA CLINICA

2020 ◽  
pp. 331
Author(s):  
Alfonso Serrano Gómez
Keyword(s):  
Past Century ◽  
Medium Term ◽  
Short Term ◽  
The Past ◽  
The 1960S

La Criminología en España ha sido tutelada por los penalistas. Algunos hicieron aportaciones teóricas. A finales de la década de los sesenta del siglo pasado se inicia una nueva etapa con la aparición de los primeros trabajos empíricos y de Criminología clínica. En los últimos años se ha creado el Grado en Criminología en más de treinta universidades, aunque en el campo de la investigación disponemos de pocos expertos en la disciplina. El futuro científico de la Criminología en nuestro país a corto plazo, e incluso a medio, parece poco prometedor.Criminology in Spain has been protected by criminalists. Some made theoretical contributions. At the end of the decade of the 1960s of the past century, a new stage was initiated with then appearance of the first empirical papers and those on clinical criminology. In recent years the Degree in Criminology has been created in more than thirty universities, although in the field of investigation we have few experts in the discipline. The scientific future of criminology in our country in the short term, even in the medium term, seems quite bleak.

Selected Nova Scotia old-growth forests: Age, ecology, structure, scoring

2003 ◽  
Vol 79 (3) ◽  
pp. 632-644 ◽  
Author(s):  
Bruce J Stewart ◽  
Peter D Neily ◽  
Eugene J Quigley ◽  
Lawrence K Benjamin
Keyword(s):  
Age Structure ◽  
Coarse Woody Debris ◽  
Sugar Maple ◽  
Dead Wood ◽  
Woody Debris ◽  
Large Diameter ◽  
Basal Area ◽  
Red Spruce ◽  
White Pine ◽  
Old Growth

A study of four old-growth stands in Nova Scotia was conducted to document the ecological characteristics of these currently rare Acadian forest ecosystems. Stands were selected to represent the two dominant climax forest types, hemlock–red spruce–eastern white pine, and sugar maple–yellow birch–beech. Data include measurements of age structure, species composition, diameter distribution, basal area, height, coarse woody debris, snags, vertical structure, and canopy condition. All stands were determined to be uneven-aged. Old-growth reference ages calculated for the stands ranged from 164 to 214 years. All stands displayed broad diameter distributions that had peak basal area representation in the 40- to 50-cm diameter classes. Volumes of dead wood ranged from 111 to 148 m3/ha in the softwood stands and from 63 to 83m3/ha in the hardwood stands. Dead wood consisted of approximately one-third snags and two thirds downed coarse woody debris. Measurements from the stands were used to evaluate Nova Scotia's recently developed Old Forest Scoring System. Six stand attributes were rated for a maximum score of 100: stand age, primal value, number of large-diameter trees, length of large-diameter dead wood, canopy structure, and understorey structure. Based on the age attribute, three of the four stands were classed as Mature Old Growth and one was very close, indicating that all are in the shifting mosaic stage of late forest succession. The scores for all stands were relatively high, ranging from 75 to 85, as would be expected from some of the best old-growth stands in the province. Key words: old growth, climax, primal, late succession, uneven-aged, scoring, coarse woody debris, age structure, diameter, Acadian forest, northern hardwood, red spruce, eastern hemlock, white pine, sugar maple, yellow birch, American beech

scholarly journals Winter Stoneflies of Illinois (Insecta: Plecoptera)

2002 ◽  
Vol 36 (1-5) ◽  
pp. 195-274
Author(s):  
Donald W. Webb
Keyword(s):  
Species Diversity ◽  
Current Status ◽  
Past Century ◽  
Generalist Species ◽  
The Past ◽  
Illinois Natural History Survey ◽  
Habitat Specialists ◽  
The 1960S ◽  
History Survey ◽  
Made In

Winter stoneflies (Insecta: Plecoptera) are an aquatic group of insects whose adults emerge in IIlinois from late November to early April. Twenty-one species have been reported from Illinois. Extensive collections of winter stoneflies were made in Illinois during the 1920s and 1930s by Frison, the 1960s by Ross and “the winter stonefly club’, and the 1990s by Webb. These specimens are housed in the Insect Collection of the Illinois Natural History Survey and allowed for an evaluation of the current status of these species following a century of environmental change.Over the past century (1900-2000), the species diversity of winter stoneflies averaged 2.5 species per county with species reported from every county but 3 (Carroll, DuPage, Ford) and with 10 counties recording 5 or more species. Pope County (13 species) reported the greatest species diversity. During the recent resurvey (1976-2000), species diversity average 1.9 species per county withspecimens not collected in 11 counties, and only 3 counties (Hardin, Pope, and Saline) exhibited 5 or more species.Four species are considered extirpated from Illinois: Allocapnia illinoensis, Nemocapnia carolina, Paracapnia angulata, and Taeniopteryx parvula. Seven species were found to be common (known from more than 15 localities): Allocapnia forbesi, A. granulata, A. mystica, A. rickeri, A. vivipara, Taeniopteryx burksi, and T: nivalis. Four species are considered uncommon (known from 4—15localities): Allocapnia recta, Strophopteryx fasciata, Taeniopteryx metequi and Zealeuctra claasseni. Six species are considered rare (known from 1-3 localities): Allocapnia nivicola, A. smithi, Prostoia completa, Taeniopteryx lita, Zealeuctra fraxina, and Z. narfi. Significantly reduced patterns of distribution were noted in three species: A. granulata, A. mystica, and Strophopteryx fasciata. OnlyTaeniopteryx nivalis, previously rare, is now spreading its distribution across northern Illinois.There has been a modest decline during the past century in the diversity of stonefly species within various counties. Also, a trend was observed toward an increase in pollution-tolerant, “generalist” species with a decrease in pollution-sensitive, habitat “specialists.”

scholarly journals Relationships between Tree Vigor Indices and a Tree Classification System Based upon Apparent Stem Defects in Northern Hardwood Stands

Forests ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 588 ◽  
Author(s):  
Edouard Moreau ◽  
Steve Bédard ◽  
Guillaume Moreau ◽  
David Pothier
Keyword(s):  
Classification System ◽  
Acer Saccharum ◽  
Sugar Maple ◽  
Basal Area ◽  
Growth Efficiency ◽  
Efficiency Index ◽  
Classification Systems ◽  
Betula Alleghaniensis ◽  
Forest Zone ◽  
Northern Hardwood

Many northern hardwood stands include several low-vigor trees as a result of past management. To restore these degraded stands, partial cuts are applied with partly validated tree classification systems that are based upon apparent stem defects. We sampled 214 sugar maple (Acer saccharum Marsh.) and 84 yellow birch (Betula alleghaniensis Britt.) trees from six sites covering the northern hardwood forest zone of the Province of Quebec, Canada. We evaluated their vigor with a four-class system, and quantified the growth efficiency index and several indices that were based solely upon radial growth. The growth efficiency index increased non-significantly with increasing tree vigor class. The five-year basal area increment (BAI-1-5) was significantly different between the lowest and highest tree vigor classes. Yet, temporal changes in BAI-1-5 helped classify correctly only 16% of high-vigor trees that became poorly vigorous 8–10 years later. Overall, these results suggest that the tree classification system is weakly related to actual tree vigor and its application likely generates few significant gains in future stand vigor. Modifying and simplifying the tree vigor system must be considered to facilitate the tree marking process that is required to improve the vigor of degraded stands.

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