scholarly journals Ein Modell zur Bilanzierung des holzerntebedingten Nährstoffentzugs auf Schweizer Waldböden

2010 ◽  
Vol 161 (10) ◽  
pp. 401-412
Author(s):  
Renato Lemm ◽  
Oliver Thees ◽  
Urs Hensler ◽  
Jörg Hässig ◽  
Anton Bürgi ◽  
...  
Keyword(s):  
Critical Analysis ◽  
Nutrient Deficiency ◽  
Soil Nutrient ◽  
Timber Harvesting ◽  
Computational Implementation ◽  
Simulation Results ◽  
Forest Enterprises ◽  
Nutrient Extraction ◽  
Structure And Functions

Abstract A model named NBM was developed to judge quantitatively the risks of soil nutrient extraction due to timber harvesting in Switzerland. The model can be used for forest enterprises as well as for larger regions. It assesses nutrient extraction at the level of the single stand as part of a scenario analysis. The extraction of nine nutrients as a result of harvesting is quantified under conditions with different silvicultural and bucking methods. The results are then compared to the soil potentials and changes in these potentials. The simulation results are assessed with respect to sustainability. Two criteria are used to evaluate the long-term risk of nutrient deficiency. The validity of the model in a practical context is limited as more soil informations would be needed. The paper describes structure and functions of the model, its computational implementation, and the results obtained from its first application in the forest enterprise of Bremgarten, Wohlen, Waltenschwil. It ends with a critical analysis of this first implementation of the model.

scholarly journals Improving Economic Management Decisions in Forestry with the SorSim Assortment Model

2019 ◽  
Vol 41 (1) ◽  
pp. 71-83
Author(s):  
Renato Lemm ◽  
Clemens Blattert ◽  
Stefan Holm ◽  
Leo Bont ◽  
Oliver Thees
Keyword(s):  
Optimal Allocation ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Forest Stands ◽  
Economic Management ◽  
Practical Advantage ◽  
Potential Applications ◽  
Forest Enterprises ◽  
Individual Trees

The sustainable supply of timber is one of the most important forest ecosystem services and a decisive factor determining the long-term profitability of forest enterprises. If timber production is to be economically viable, there must always be a way to analyse forest stands and trees felled for exploitation with regard to the wood assortments they contain. Only then can the expected timber yields, achieved by various silvicultural strategies or actions and different sorting options, be quantified with sufficient accuracy. The SorSim assortment simulator was developed for forest practitioners and forest scientists in Switzerland to realistically simulate the sorting of individual trees and entire forest stands based on defined specifications. SorSim has a simple user interface and comes in a number of different language versions (G, E, F). The software is implemented in Java, making it platform-independent. It can be downloaded for free at (https://www.wsl.ch/en/projects/sortimentsimulator-sorsim.html). This article provides an overview of how the simulator works and demonstrates its potential applications based on a practical and a scientific example. A particular practical advantage is that the composition of the assortments of the planned harvests can be estimated according to quantity and value. When used in strategic planning and especially in research, SorSim provides a basis for analysing either long-term developments in yields from forest stands or silvicultural treatment methods. Based on an even-aged and a selection forest stand, the scientific example shows how strongly the assessment of the advantageousness of two different silvicultural strategies depends on the time when the calculation was made (using historical and current assortment revenues and timber harvesting costs). In particular, the combination of SorSim with timber harvest productivity models enables differentiated forest economic insights. Various approaches for value-based optimisation in the sorting of individual trees and for the optimal allocation of harvesting activities to defined customer demands are currently being examined as further SorSim developments.

The effect of long-term nutrient deficiency on the abundance and community composition of arbuscular mycorrhizal fungi in a mountainous grassland

2021 ◽  
Author(s):  
Kian Jenab ◽  
Stefan Gorka ◽  
Sean Darcy ◽  
Lucia Fuchslueger ◽  
Alberto Canarini ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Community Composition ◽  
Plant Community ◽  
Fungal Biomass ◽  
Nutrient Deficiency ◽  
Soil Nutrient ◽  
Am Fungi ◽  
Fungal Communities ◽  
Plant Community Composition

<p>Arbuscular mycorrhiza (AM) fungi are associated with almost all land plants and provide soil nutrients and other benefits to their plant hosts in exchange for photosynthetic products. While fertilization regimes in managed grasslands or agricultural systems are tailored for increasing plant biomass, their potential effects on AM fungi are rarely taken into account. Nutrient-driven changes in abundance and community composition of AM fungi, however, may feedback on ecosystem performance in the long term. Therefore, it is necessary to get a better understanding on how AM fungal communities respond to changes and imbalances in soil nutrient availabilities.</p><p>Here, we evaluated how long-term nutrient deficiency of phosphorus (P), nitrogen (N) and potassium (K) affects the abundance and community composition of AM fungi in a mountainous grassland. In addition, we investigated how the responses of AM fungi to those deficiencies were modulated by liming and the type of fertilizer addition (inorganic versus organic).</p><p>Our study was carried out on a long-term nutrient deficiency experimental grassland site in Admont (Styria, Austria), established in 1946. Different fertilization treatments were applied for more than 70 years in a randomized block design, including numerous combinations of inorganic (P, N, K with/without lime) and organic (solid manure and liquid slurry) fertilizers. The hay meadow at the site is cut three times per year and biomass is not returned to the system. Therefore, biomass and nutrients have been continuously removed for decades, leading to different types of soil nutrient deficiency. In this study, we collected both root and soil samples in July 2019 and quantified AM fungi and other microbial groups by measuring neutral fatty acid (NLFA) and phospholipid fatty acid (PLFA) biomarkers, respectively. Additionally, we applied DNA and RNA-based amplicon sequencing of the 18S rRNA gene to identify AM fungal community composition.</p><p>Our data shows that deficiencies of one or more elements had a major impact on both AM fungal biomass and community composition. AM fungal biomass was higher in plots that received no fertilizers compared to inorganically fertilized plots, but lower in plots which were deficient only in certain single or multiple elements, specifically in plots fertilized with inorganic N only (i.e., deficient in P and K). Conversely, liming and organic fertilizer amendments increased AM fungal biomass compared to plots containing inorganic fertilizers without lime. Across all treatments, AM fungal biomass was positively correlated with pH and soil water content, and negatively with dissolved N compounds, indicating indirect effects via responses of other soil parameters to nutrient deficiency. Long-term nutrient deficiency also altered plant community composition, which may also have indirectly affected AM fungal communities.</p><p>We conclude that long-term nutrient deficiency, and in particular the stoichiometry of available nutrients, strongly affects the abundance and community composition of AM fungi in grassland soil. This response may be linked to changes in plant community composition or soil chemistry both as a result and as a cause, emphasizing the complexity of feedbacks determining the response of grassland ecosystems to changing nutrient conditions.</p>

scholarly journals Long-term effects of soil nutrient deficiency on arbuscular mycorrhizal communities

2012 ◽  
Vol 26 (2) ◽  
pp. 532-540 ◽  
Author(s):  
Pedro M. Antunes ◽  
Anika Lehmann ◽  
Miranda M. Hart ◽  
Michael Baumecker ◽  
Matthias C. Rillig
Keyword(s):  
Nutrient Deficiency ◽  
Soil Nutrient ◽  
Arbuscular Mycorrhizal ◽  
Long Term Effects

Controls of microbial N cycling in agricultural grassland soils

2021 ◽  
Author(s):  
Felix Spiegel ◽  
Lucia Fuchslueger ◽  
Alberto Canarini ◽  
Jörg Schnecker ◽  
Hannes Schmidt ◽  
...  
Keyword(s):  
N Mineralization ◽  
Soil Microbial Communities ◽  
Nutrient Deficiency ◽  
Soil Nutrient ◽  
N Cycling ◽  
Inorganic N ◽  
Soil Microbial ◽  
Soil Nutrient Cycling ◽  
Microbial N

<p>Fertilization experiments provide insights into elemental imbalances in soil microbial communities and their consequences for soil nutrient cycling. By addition of selected nutrients, other nutrients become deficient and limiting for soil microorganisms as well as for plants. In this study we focused on microbial nitrogen (N) cycling in a long-term nutrient manipulation experiment. In many soils, the rate-limiting step in N cycling is depolymerization of high-molecular-weight nitrogen compounds (e.g., proteins) to oligomers (e.g., peptides) and monomers (e.g., amino acids) rather than the subsequent steps of mineralization (ammonification) and nitrification. The aim of our study was to determine whether nutrient deficiency directly or indirectly – via changes in plant carbon (C) inputs - affects soil microbial N processing.</p><p>We collected soil samples from a fertilization experiment, established in 1946 on a hay meadow close to Admont (Styria, Austria). The field experiment consisted of a full factorial combination of inorganic N, P, and K fertilization and a control with no fertilizers. Furthermore, liming (Ca-addition) and organic fertilizer application treatments (solid manure and liquid slurry) were established. In the experiment, plant biomass is harvested three times per year, inducing strong nutrient limitation in plots that have not received nutrient additions (fully deficient or deficient in a single element). We determined gross rates of microbial protein depolymerization, N-mineralization and nitrification via isotope pool dilution assays with <sup>15</sup>N-labeled amino acids, NH<sub>4</sub><sup>+</sup>, and NO<sub>3</sub><sup>-</sup>. We hypothesized that N deficiency (lack of N fertilization) would stimulate microbial N mining (depolymerization), and reduce subsequent N mineralization and nitrification. In contrast, we expected that organic fertilization would alleviate microbial C and N limitations, reducing N depolymerization rates and increasing mineralization and nitrification.</p><p>Our results show that organically fertilized and limed soils have significantly lower gross protein depolymerization rates than plots receiving inorganic N. No significant differences were found comparing gross N-mineralization and gross nitrification rates across the different treatments. Given the higher rates of protein depolymerization in inorganically fertilized soils as compared to organically fertilized and limed soils, microbial N processes seem to be controlled by plant C input and/or soil pH rather than by direct soil nutrient availability. However, depolymerization of macromolecular N does not only supply N to the soil microbial community but also organic C. Thus, the reduced plant C input compared to fully fertilized soils may have caused microorganisms to increase their mining for a C-containing energy source, thereby increasing protein depolymerization rates. In summary, this study suggests that long term nutrient deficiency or nutrient imbalances may affect soil nutrient cycling indirectly by changing plant C inputs (via reduced primary production) and/or changing soil pH, rather than directly, by nutrient availability. This further indicates that soil microbial communities are rather C than nutrient limited.</p><p> </p>

Der Wald-Wild-Konflikt – was kann die Forstökonomie zur Lösung beitragen? (Essay)

2017 ◽  
Vol 168 (4) ◽  
pp. 181-185
Author(s):  
Marc Hanewinkel
Keyword(s):  
Forest Economics ◽  
Production Risk ◽  
Damage Compensation ◽  
Land Expectation Value ◽  
Compensation Methods ◽  
The Future ◽  
Single Tree Selection ◽  
Simplifying Assumptions ◽  
Forest Enterprises

The forest-game conflict – how can forest economics contribute to solve it? (Essay) Core parameters of forest economics such as land expectation value or highest revenue show that damage caused by wild ungulates can critically influence the economic success of forest enterprises. When assessing and evaluating the damage in order to calculate damage compensation, methods are applied in Germany that look either into the past (“cost value methods”) or into the future (“expected value methods”). The manifold uncertainties related to this evaluation over long-term production periods are taken into account within a framework of conventions through strongly simplifying assumptions. Only lately, the increased production risk due to game-induced loss of species diversity is also considered. Additional aspects that should be taken into account in the future are the loss of climate-adapted species, the change of the insurance values of forest ecosystems and the impossibility of specific management systems such as single-tree selection forestry due to the influence of game. Because of high transaction costs when assessing the damage, financial compensation should only be the “ultimate measure” and a meditation between stakeholder groups with the goal to find a cooperative solution before the damage occurs should be preferred.

Vom Forst zum Wald. Entwicklungstendenzen im naturnahen Waldbau | From a Production-Oriented Forest to a Multipurpose Forest. New Trends in Near-Natural Silviculture

1999 ◽  
Vol 150 (12) ◽  
pp. 484-488 ◽  
Author(s):  
Wolf Hockenjos
Keyword(s):  
Forest Management ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Natural Forest ◽  
The Other ◽  
Private Forest ◽  
Wide Spread ◽  
Great Demand ◽  
The Past ◽  
Forest Enterprises

Concepts of near-natural forestry are in great demand these days. Most German forest administrations and private forest enterprises attach great importance to being as «near-natural» as possible. This should allow them to make the most of biological rationalisation. The concept of near-natural forestry is widely accepted, especially by conservationists. However, it is much too early to analyse how successful near-natural forestry has been to date, and therefore to decide whether an era of genuine near-natural forest management has really begun. Despite wide-spread recognition, near-natural forestry is jeopardised by mechanised timber harvesting, and particularly by the large-timber harvester. The risk is that machines, which are currently just one element of the timber harvest will gain in importance and gradually become the decisive element. The forest would then be forced to meet the needs of machinery, not the other way round. Forests would consequently become so inhospitable that they would bear no resemblance to the sylvan image conjured up by potential visitors. This could mean taking a huge step backwards: from a near-natural forest to a forest dominated by machinery. The model of multipurpose forest management would become less viable, and the forest would become divided into areas for production, and separate areas for recreation and ecology. The consequences of technical intervention need to be carefully considered, if near-natural forestry is not to become a thing of the past.

scholarly journals Mental health consequences of home demolition policy towered Palestinians: Literature review

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Mohammed Marie ◽  
Sana SaadAdeen
Keyword(s):  
Mental Health ◽  
Critical Analysis ◽  
Educational Opportunities ◽  
Housing Conditions ◽  
Health Consequences ◽  
Low Incomes ◽  
Family Home ◽  
Study Type ◽  
Type Sample

Abstract Abstract Home demolition is considered a miserable and frequent reality of life for thousands of Palestinian people. Recently, in January 2020, at least 44 structures were demolished by Israeli forces, displacing at least 87 people. Studies have revealed high levels of stress was associated with losing a family home during home demolition, and the stress doesn’t only carry out immediate effects but also long-term mental consequences. This paper aims to provide an overview of the literature and established studies related to the mental health consequences of home demolitions in Palestine. Methods PubMed, Science Direct, Semantic Scholar and Google Scholar were used to search for materials for the critical analysis of empirical articles. The following aspects were taken into consideration: study type, sample, and key findings. Results In this review, nine studies related to mental health consequences of home demolition were found and considered in this paper. The results indicate depression, stress, anxiety, phobias and lack of hope in the future are mutual themes running throughout the lives of those Palestinian families who have actually experienced home demolition along with those who have experienced a constant threat of demolition to their homes. In addition, many of life stressors such as lack of educational opportunities, low incomes, and a tendency to live in poor housing conditions after and before demolition also play a role in developing serious mental disorders. Conclusion As primary prevention, the practice of home demolition in Palestine has to be ended. In addition to conduct a constant monitoring of the resulting displacement and the damage caused, and ensuring the necessary assistance in particular mental health and psychological support for victims of home demolitions.

Long-term fertilization increases soil nutrient accumulations but decreases biological activity in navel orange orchards of subtropical China

2016 ◽  
Vol 17 (9) ◽  
pp. 2346-2356 ◽  
Author(s):  
Song-Ze Wan ◽  
Han-Jiao Gu ◽  
Qing-Pei Yang ◽  
Xiao-Fei Hu ◽  
Xiang-Min Fang ◽  
...  
Keyword(s):  
Biological Activity ◽  
Soil Nutrient ◽  
Navel Orange ◽  
Subtropical China

Reliability Parameters Forecasting for Transmission Lines Based on Principal Component Regression

2013 ◽  
Vol 291-294 ◽  
pp. 2381-2386 ◽  
Author(s):  
Wen Xia Liu ◽  
Ji Kai Xu ◽  
Hong Yuan Jiang ◽  
Yong Tao Shen
Keyword(s):  
Principal Component Analysis ◽  
Transmission Lines ◽  
Principal Component Regression ◽  
Principal Component ◽  
Forecasting Accuracy ◽  
Factors Affecting ◽  
Reliability Parameters ◽  
Impacting Factors ◽  
Simulation Results

It is the foundation for evaluating the reliability of transmission lines to obtain and analyze the original reliability parameters. However, these parameters depend on long- term statistic and calculation. In the case of lacking such parameters in a new project , this paper proposes a method of Principal Component Analysis to obtain the principal component of the impacting factors ,in which various factors affecting reliability parameters are taken into account. Through this method, we can use PCR to obtain the failure rate of the unknown transmission lines on the base of the known credible lines’ rates. The simulation results show that the proposed approach possesses higher forecasting accuracy and provides references for the power system dispatching departments and transmission lines maintenance departments.

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