scholarly journals Management of spontaneously regenerated mixed stands of birch and Norway spruce in Sweden

Silva Fennica ◽  
2021 ◽  
Vol 55 (4) ◽  
Author(s):  
Felicia Dahlgren Lidman ◽  
Emma Holmström ◽  
Tomas Lundmark ◽  
Nils Fahlvik
Keyword(s):  
Interest Rates ◽  
Norway Spruce ◽  
Management Strategy ◽  
Management Strategies ◽  
Stem Volume ◽  
Stand Age ◽  
Production Volume ◽  
Total Production ◽  
Mixed Stands ◽  
Spontaneous Regeneration

Timber production and profitability were evaluated for spontaneously-regenerated mixtures on two formerly clearcut areas. The abandoned areas developed into birch-dominated ( Roth and Ehrh.) stands with successional ingrowth of Norway spruce ( (L.) H. Karst.). An experiment with randomized treatments within blocks was established, using three management strategies and one unthinned control, resulting in variation in optimal rotation age, merchantable volume and species composition. The management strategies were evaluated based on total production (volume) by using measured growth data 42 years after clearcutting and the modelled future stand development. The long-term effects of spontaneous regeneration and management strategies were evaluated based on land expectation value (LEV) and compared with a fifth management strategy using artificial regeneration and intense thinnings. 12 years after treatment, at a stand age of 42 years, the unthinned control had produced the highest total stem volume. At interest rates of 2% or higher, the unmanaged forest was an economically viable strategy, even compared to an intensive management strategy with a preferred merchantable timber species. Interest rates clearly impacted the profitability of the different management strategies. This study shows that when spontaneous regeneration is successful and dense, the first competition release can have a high impact on the development of future crop trees and on the species mixture.Betula pendulaBetula pubescensPicea abies

scholarly journals Over- and Underyielding in Time and Space in Experiments with Mixed Stands of Scots Pine and Norway Spruce

Forests ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 495 ◽  
Author(s):  
Lars Drössler ◽  
Eric Agestam ◽  
Kamil Bielak ◽  
Małgorzata Dudzinska ◽  
Julia Koricheva ◽  
...  
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Tree Species ◽  
Mixed Forest ◽  
Stand Age ◽  
Mixed Species ◽  
Mixed Stands ◽  
Mixing Effect ◽  
Individual Site ◽  
Study Sites

Pine-spruce forests are one of the commonest mixed forest types in Europe and both tree species are very important for wood supply. This study summarized nine European studies with Scots pine and Norway spruce where a mixed-species stand and both monocultures were located in an experimental set-up. Overyielding (where growth of a mixed stand was greater than the average of both monocultures) was relatively common and often ranged between 0% and 30%, but could also be negative at individual study sites. Each individual site demonstrated consistent patterns of the mixing effect over different measurement periods. Transgressive overyielding (where the mixed-species stand was more productive than either of the monocultures) was found at three study sites, while a monoculture was more productive on the other sites. Large variation between study sites indicated that the existing experiments do not fully represent the extensive region where this mixed pine-spruce forest can occur. Pooled increment data displayed a negative influence of latitude and stand age on the mixing effect of those tree species in forests younger than 70 years.

Wastewater management strategies for the black sea coast of Turkey

1999 ◽  
Vol 39 (8) ◽  
pp. 169-176
Author(s):  
I. Ozturk ◽  
E. Yuksel ◽  
A. Tanik
Keyword(s):  
Black Sea ◽  
Management Strategy ◽  
Population Distribution ◽  
Management Strategies ◽  
The Black Sea ◽  
Wastewater Management ◽  
Black Sea Coast ◽  
The Cost ◽  
Solid Waste Landfills ◽  
Sea Coast

The Black Sea, surrounded by six riparian countries, is under the threat of severe pollution, giving rise to the need of taking precautions to protect it from further deterioration. In this paper, an effort putting forth a wastewater treatment and management strategy is outlined for the Black Sea coast of Turkey, including both the technical and financial aspects. The present situation of the coast in terms of land-based pollution and infrastructure is stated, followed by an applicable management strategy. The strategy developed for the coastal settlements involves various stagewise treatment schemes based on population distribution and densities along the coastline, and on the availability of land in a specified period of thirty years. Similar strategies are proposed for the control of pollution originating from industries, for those carried by rivers joining the sea, and for leachate of solid waste landfills. The cost estimations of various treatment schemes are also given in terms of population equivalents.

Central Bank Liquidity Management and the Signal Extraction Problem on the Money Market / Die Liquiditätssteuerung der Notenbank und das Signal-extraktionsproblem am Geldmarkt

2000 ◽  
Vol 220 (3) ◽  
pp. 284-301
Author(s):  
Ulrich Bindseil
Keyword(s):  
Monetary Policy ◽  
Central Bank ◽  
Interest Rates ◽  
Term Structure ◽  
Management Strategies ◽  
Money Market ◽  
Signal Extraction ◽  
Maintenance Period ◽  
Liquidity Management ◽  
Expectation Theory

Summary Understanding the factors determining overnight rates is crucial both for central bankers and private market participants, since, assuming the validity of the expectation theory of the term structure of interest rates, expectations with regard to this “monadic” maturity should determine longer term rates, which are deemed to be relevant for the transmission of monetary policy. The note proposes a simple model of the money market within a two-day long reserve maintenance period to derive relationships between the relevant quantities, expectations concerning these quantities for the rest of the reserve maintenance period, and overnight rates. It is argued that a signal extraction problem faced by banks when observing quantities such as their aggregate reserve holdings and allotment amounts of monetary policy operations is at the core of these relationships. The usefulness of the model is illustrated by applying it to the analysis of three alternative liquidity management strategies of a central bank.

scholarly journals Assessment of Stem Volume on Plots Using Terrestrial Laser Scanner: A Precision Forestry Application

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 301
Author(s):  
Dimitrios Panagiotidis ◽  
Azadeh Abdollahnejad ◽  
Martin Slavík
Keyword(s):  
Norway Spruce ◽  
Laser Scanner ◽  
Estimation Methods ◽  
Coefficient Of Determination ◽  
Stem Volume ◽  
Small Scale ◽  
Terrestrial Laser Scanner ◽  
Precision Forestry ◽  
Total Tree ◽  
European Oak

Timber volume is an important asset, not only as an ecological component, but also as a key source of present and future revenues, which requires precise estimates. We used the Trimble TX8 survey-grade terrestrial laser scanner (TLS) to create a detailed 3D point cloud for extracting total tree height and diameter at breast height (1.3 m; DBH). We compared two different methods to accurately estimate total tree heights: the first method was based on a modified version of the local maxima algorithm for treetop detection, “HTTD”, and for the second method we used the centers of stem cross-sections at stump height (30 cm), “HTSP”. DBH was estimated by a computationally robust algebraic circle-fitting algorithm through hierarchical cluster analysis (HCA). This study aimed to assess the accuracy of these descriptors for evaluating total stem volume by comparing the results with the reference tree measurements. The difference between the estimated total stem volume from HTTD and measured stems was 2.732 m3 for European oak and 2.971 m3 for Norway spruce; differences between the estimated volume from HTSP and measured stems was 1.228 m3 and 2.006 m3 for European oak and Norway spruce, respectively. The coefficient of determination indicated a strong relationship between the measured and estimated total stem volumes from both height estimation methods with an R2 = 0.89 for HTTD and R2 = 0.87 for HTSP for European oak, and R2 = 0.98 for both HTTD and HTSP for Norway spruce. Our study has demonstrated the feasibility of finer-resolution remote sensing data for semi-automatic stem volumetric modeling of small-scale studies with high accuracy as a potential advancement in precision forestry.

Large Bowel Obstruction

2021 ◽  
Vol 34 (04) ◽  
pp. 233-241
Author(s):  
Wali R. Johnson ◽  
Alexander T. Hawkins
Keyword(s):  
Bowel Obstruction ◽  
Large Bowel ◽  
Management Strategy ◽  
Management Strategies ◽  
Large Bowel Obstruction ◽  
Clinical Guidance ◽  
Work Up

AbstractNearly one-quarter of bowel obstructions occur in the large bowel. As with all bowel obstructions, large bowel obstructions have three defining characteristics: partial or complete, intrinsic or extrinsic, benign or malignant. The work-up for a large bowel obstruction should focus on the etiology of the obstruction as well as severity. Management strategy is contingent on the previous characteristics and can include endoscopy, diversion, or resection. This chapter will discuss common and rare etiologies of large bowel obstructions as well as management strategies for clinical guidance.

Small Project Management Strategy and its Relationship to Satisfaction on Life as Recognized by its Employees

2020 ◽  
Vol 8 (1) ◽  
pp. 34-61
Author(s):  
Neama Mostafa RaKaban ◽  
Hanaa Saeed Salama
Keyword(s):  
Project Management ◽  
Standard Deviation ◽  
Young People ◽  
Management Strategy ◽  
Satisfaction With Life ◽  
Management Strategies ◽  
Social Situation ◽  
The Social ◽  
Level Of Significance ◽  
The Relationship

The research aims to study the relationship between the management strategies of the small projects of the workers in their dimensions: (Project phase strategy, making decisions, the project management strategy of financial production, Marketing Productive Management Strategy, the strategy of managing productive legal projects) with satisfaction with life dimensions: (Psychological compatibility, Self-compliance, Work environment, and Social compatibility) . The research sample consisted of 102 persons working in four small projects, "Ceramics - Bamboo - Serma - Hand Carpets". They were selected in a pesky-purpose manner from the employees of these projects in Sakiet Abu Shaara village, Sentris, Menoufia Governorate and 10th of Ramadan City. "General data form", "Project Management Strategies scale", and "measure of satisfaction with life" were applied. The study followed the descriptive and analytical approach. The data were categorized and analyzed using appropriate statistical methods through the SPSS statistical program such as number and percentages, arithmetic mean, standard deviation, T-test, Pearson correlation coefficient, Chi-square and F-test. The most important results are related to the relationship between the project management strategy and the financial productivity and self-compliance at the level of significance of 0.01, which means that the realization of the requirements of the project in terms of finance and meet the needs, resulting in self-compatibility.  There is also a correlation between the project management strategy and the business environment at the level of 0.01 meaning that whenever the project needs to be met in terms of funding and meet the needs of the project as this leads to compatibility with the place of residence of the project and the surrounding environment, there is an inverse correlation Between the social situation and the decision-making at the level of significance of 0.01, which means that the greater the number of employees are married the less ability to make the decisions needed in those small projects, which means the impact of the ability to make decisions on the social situation of the individual. There were statistically significant differences between the averages of the different projects in terms of the overall project management strategy according to the dwelling. The highest value was for the medium in the ceramics project and the lowest in the hand carpets where the ceramic represents the highest average 2.000 while the carpets represent the lowest average by 1.809 at the level of significance 0.1. There were significant differences between the mean of the various projects in terms of satisfaction with total life according to the dimension of psychological compatibility and the highest value for the average in the hand carpet project where the results showed that the average and standard deviation of hand carpets is (23.745 ± 4.38) The recommendations of the government, decision-makers and ministries to establish a culture of entrepreneurship and motivate young people to set up private projects through the media, paying attention to the enactment of laws on small projects to motivate young people to establish and develop small and micro enterprises, In various stages to ensure the success and continuity of the project.

PROBLEM LOANS MANAGEMENT STRATEGIES UNDER CONDITIONS OF REMAINING RISKS OF UNCERTAINTY OF ECONOMIC DEVELOPMENT

2021 ◽  
Vol 2 (5) ◽  
pp. 128-135
Author(s):  
R. M. GUSEYNOV ◽  
Keyword(s):  
Economic Development ◽  
Management Strategy ◽  
Management Strategies ◽  
Economic Uncertainty

The article is devoted to the study of the problem loans management strategy in the context of the con-tinuing risks of economic uncertainty. The advantages and features of the restructuring of problem loans dur-ing the COVID-19 pandemic are being investigated.

scholarly journals WATER MANAGEMENT STRATEGIES UNDER DEFICIT IRRIGATION

2008 ◽  
Vol 39 (4) ◽  
pp. 27 ◽  
Author(s):  
Antonino Capra ◽  
Simona Consoli ◽  
Baldassare Scicolone
Keyword(s):  
Water Management ◽  
Deficit Irrigation ◽  
Management Strategies ◽  
Yield Reduction ◽  
Research Approach ◽  
Total Production ◽  
Economic Aspects ◽  
Optimization Strategy ◽  
Full Irrigation ◽  
Positive Effects

Deficit irrigation (DI) is an optimization strategy whereby net returns are maximized by reducing the amount of irrigation water; crops are deliberated allowed to sustain some degree of water deficit and yield reduction. Although the DI strategy dates back to the 1970s, this technique is not usually adopted as a practical alternative to full irrigation by either academics or practitioners. Furthermore, there is a certain amount of confusion regarding its concept. In fact, a review of recent literature dealing with DI has shown that only a few papers use the concept of DI in its complete sense (e.g. both the agronomic and economic aspects). A number of papers only deal with the physiological and agronomical aspects of DI or concern techniques such as Regulated Deficit Irrigation (RDI) and Partial Root Drying (PRD). The paper includes two main parts: i) a review of the principal water management strategies under deficit conditions (e.g. conventional DI, RDI and PRD); and ii) a description of a recent experimental research conducted by the authors in Sicily (Italy) that integrates agronomic, engineering and economic aspects of DI at farm level. Most of the literature reviewed here showed, in general, quite positive effects from DI application, mostly evidenced when the economics of DI is included in the research approach. With regard to the agronomic effects, total fresh mass and total production is generally reduced under DI, whereas the effects on dry matter and product quality are positive, mainly in crops for which excessive soil water availability can cause significant reductions in fruit size, colour or composition (grapes, tomatoes, mangos, etc.). The experimental trial on a lettuce crop in Sicily, during 2005 and 2006, shows that the highest mean marketable yield of lettuce (55.3 t ha-1 in 2005 and 51.9 t ha-1 in 2006) was recorded in plots which received 100% of ET0-PM (reference evapotranspiration by the Penman- Monteith method) applied water. In the land-limiting case, the estimated optimal economic levels were quite similar to the optimal agronomic levels. In the waterlimiting case DI ranges, at least as profitable as full irrigation, were of 17-49% ET0-PM and of 71-90% ET0-PM in 2005 and 2006 respectively.

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