Forest History: International Studies on Socioeconomic and Forest Ecosystem Change

2002 ◽  
Vol 159 (3) ◽  
pp. 293 ◽  
Author(s):  
R. Baker
Keyword(s):  
Forest Ecosystem ◽  
Forest History ◽  
Ecosystem Change ◽  
International Studies

scholarly journals What Are Intermediate-Severity Forest Disturbances and Why Are They Important?

Forests ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. 579 ◽  
Author(s):  
Justin Hart ◽  
Jonathan Kleinman
Keyword(s):  
Forest Ecosystem ◽  
Forest Disturbance ◽  
Spatial Extent ◽  
Ecosystem Change ◽  
Forest Disturbances ◽  
Height Ratio ◽  
Catastrophic Events ◽  
Canopy Opening ◽  
Disturbance Processes

The classification of discrete forest disturbance events is usually based on the spatial extent, magnitude, and frequency of the disturbance. Based on these characteristics, disturbances are placed into one of three broad categories, gap-scale, intermediate-severity, or catastrophic disturbance, along the disturbance classification gradient. We contend that our understanding of disturbance processes near the endpoints of the disturbance classification gradient far exceeds that of intermediate-severity events. We hypothesize that intermediate-severity disturbances are more common, and that they are more important drivers of forest ecosystem change than is commonly recognized. Here, we provide a review of intermediate-severity disturbances that includes proposed criteria for categorizing disturbances on the classification gradient. We propose that the canopy opening diameter to height ratio (D:H) be used to delineate gap-scale from intermediate-severity events and that the threshold between intermediate and catastrophic events be based on the influence of residual trees on the composition of the regeneration layer. We also provide examples of intermediate-severity disturbance agents, return intervals for these events, and recommendations for incorporating natural intermediate-severity disturbance patterns in silvicultural systems.

scholarly journals Quantitative Assessment of Climate Change Impacts On Forest Ecosystem

2021 ◽  
Author(s):  
Dan Liu ◽  
Hao Yan ◽  
Cheng long Yu ◽  
Shi Ping Yin ◽  
Cheng Wei Wang ◽  
...  
Keyword(s):  
Climate Change ◽  
Forest Ecosystem ◽  
Quantitative Assessment ◽  
Net Primary Productivity ◽  
Climate Impact ◽  
Vegetation Coverage ◽  
Ecosystem Change ◽  
Heilongjiang Province ◽  
Sequestration Potential ◽  
The Impact

Abstract Characterizing and predicting the response of terrestrial ecosystems to global change is one of the key challenges of contemporary ecology and ecological conservation. The impact of climate change on forest ecosystem has been widely studied, but it rarely uses method of multi-index fusion for quantitative evaluation. In this study, forest ecosystem in Heilongjiang Province was investigated. Based on remote sensing, meteorological observation, ground survey, geographic information, MAXENT model, CASA model, carbon sequestration potential model of Zhou Guangsheng-Zhang Xinshi, pixel dichotomy model and Savitzky Golay Filter model were used. On this basis, we analysed the change characteristics of forest distribution, net primary productivity and vegetation coverage. We also established a model for evaluating the impact of forest ecosystem change on climate, and made a quantitative assessment of the impact on climate. Our results indicate the following: (1) From 2001 to 2019, the forest area in Heilongjiang Province ranged from 2.34 × 105 to 2.46 × 105 km2, the forest NPP ranged from 40.48 to 555.32 gC/m2/a, and the vegetation coverage ranged from 42.42% to 67.64%, both of which showed a significant upward trend; (2) The values of forest ecological role were significantly positively correlated with the climatic potential; (3) The results of climate impact assessment of forest ecosystem change showed the contribution rate of climate change to forest ecosystem change was negatively correlated with forest coverage, which varied from 4.79% to 18.07% in different regions (cities) of the province. This study contribute to improving evaluating influence of climate change on forest ecosystem.

Abrupt forest ecosystem change in SW Sweden during the late Holocene

The Holocene ◽  
2009 ◽  
Vol 19 (5) ◽  
pp. 691-702 ◽  
Author(s):  
Gunnar Gustavsson ◽  
Geoffrey Lemdahl ◽  
Marie-José Gaillard
Keyword(s):  
Forest Ecosystem ◽  
Late Holocene ◽  
Ecosystem Change

Epidemiological Trends in Attempted Suicide in Adolescents and Young Adults Between 1996 and 2004

Crisis ◽  
2009 ◽  
Vol 30 (3) ◽  
pp. 115-119 ◽  
Author(s):  
Stephanie De Munck ◽  
Gwendolyn Portzky ◽  
Kees Van Heeringen
Keyword(s):  
Young Adults ◽  
Attempted Suicide ◽  
Suicide Attempts ◽  
Epidemiological Studies ◽  
Adolescents And Young Adults ◽  
University Hospital ◽  
International Studies ◽  
Suicide Attempters ◽  
Increased Risk ◽  
Epidemiological Trends

Background: Notwithstanding the epidemiological studies indicating an increased risk of attempted suicide among adolescents and young adults, there is a scarcity of international studies that examine long-term epidemiological trends in rates and characteristics of this vulnerable group. Aims: This article describes the results of a 9-year monitoring study of suicide attempts in adolescents and young adults referred to the Accident and Emergency Department of the Gent University Hospital (Belgium). Methods: Between January 1996 and December 2004, trends, sociodemographic, and methodrelated characteristics of suicide attempts were assessed by a psychiatrist on data sheets. Results: Attempted suicide rates declined from 1996 to 2001 and then rose until 2004, but did not exceed previous rates. During the 9 years of monitoring, there was a preponderance of female suicide attempters, except for 1997. Rates of attempts and of fatal suicide were negatively correlated. Significantly more males than females deliberately injured themselves. Younger attempters, especially females, significantly more often poisoned themselves with analgesics. In nearly one in five attempts, alcohol was used in combination with other methods, and alcohol intake was more commonly observed in older suicide attempters. Nearly half of the adolescents were identified as repeaters. Conclusions: The results of this study warrant further monitoring of trends and characteristics of young suicide attempters.

Traditions of foreign countries studies in modern russian economic expertise

2015 ◽  
pp. 116-128 ◽  
Author(s):  
A. Kuznetsov
Keyword(s):  
Economic Policy ◽  
International Relations ◽  
World Economy ◽  
International Studies ◽  
Economic Relations ◽  
Scientific Schools ◽  
Foreign Countries ◽  
Modern Application ◽  
Academy Of Sciences ◽  
World Development

The article deals with Russian traditions of studies of foreign countries which have become an intellectual pillar for Russian economic expertise. The modern application of experience of Soviet scientific schools in international studies is shown, especially in the fields of world development forecasts, analysis of Russian foreign economic relations and research of economic policy abroad. The article is based on open sources with publications, reports and presentations about expert and analytical activities of the Institute of World Economy and International Relations (IMEMO) and other institutes of the Russian Academy of Sciences, VNIKI-Institute, MGIMO-University and some other centers. It is explained that results of international studies have become a necessary element for consulting of governmental bodies and businessmen in the epoch of globalization.

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