scholarly journals Quality Indicators of The Forest Harvesting Process In Clear-Cut Operations of Eucalyptus Stands For Energetic Purposes

2017 ◽  
Keyword(s):  
Quality Indicators ◽  
Forest Harvesting ◽  
Clear Cut ◽  
Harvesting Process

scholarly journals PREDICTABILITY IN THE PRODUCTIVE PROCESS OF THINNING AND CLEARCUTTING MECHANIZED OPERATIONS IN Pinus taeda L.

FLORESTA ◽  
2019 ◽  
Vol 50 (1) ◽  
pp. 933
Author(s):  
Bruna Martins Garcia ◽  
Philipe Ricardo Casemiro Soares ◽  
Jean Alberto Sampietro ◽  
Caroline Fernandes
Keyword(s):  
Critical Points ◽  
Control Charts ◽  
Timber Harvesting ◽  
Statistical Process ◽  
Pareto Chart ◽  
Clear Cut ◽  
Forestry Sector ◽  
Productive Process ◽  
Harvesting Process ◽  
Pinus Taeda L

Some organizations in the Brazilian forestry sector, especially in the activities carried out in forest stands, do not follow the development pace of other industries and the adoption rate of management and quality methodologies and tools. This study aimed to evaluate the predictability of timber harvesting process based on critical points identified in the selective thinning and clear cut operations. Interviews and Pareto chart were used, for the identification and evaluation of the critical points, respectively, and for the evaluation of the process, it was used the Statistical Process Control (SPC) by attributes and variables in the main failures. In the interviews conducted with workers, seven critical points were identified. The evaluation with Pareto chart showed that 80% of the failures identified during harvest are attributed to the damage to the remaining trees, sorting (measures of length and diameter of the product) and stump height. Among the possible causes of the critical points are problems with employees’ training, regular maintenance of machinery and operations planning. In the evaluation with the CEP, the control charts indicated that the sorting and stump height, although within the limits specified by the company, was considered unstable and unpredictable

Influence of streamside buffers on stream temperature response following clear-cut harvesting in western Oregon

2013 ◽  
Vol 43 (11) ◽  
pp. 993-1005 ◽  
Author(s):  
Elizabeth Cole ◽  
Michael Newton
Keyword(s):  
Management Practice ◽  
Temperature Response ◽  
Stream Temperature ◽  
Forest Harvesting ◽  
Riparian Buffers ◽  
Daily Maximum ◽  
Clear Cut ◽  
Best Management ◽  
Temperature Trends ◽  
Temperature Responses

Determining the effectiveness of different riparian buffers for mitigating forest-harvesting impacts on stream temperatures continues to be of interest throughout the world. Four small, low or medium elevation streams in managed western Oregon forests were studied to determine how the arrangement and amount of streamside retention strips (buffers) in clear-cut units influenced stream temperatures. Buffers included (i) no tree, (ii) predominantly sun-sided 12 m wide partial, and (iii) two-sided (Best Management Practice, (BMP)) 15–30 m wide buffers. Harvested units alternated with uncut units along 1800–2600 m study reaches. Impacts of harvesting on stream temperatures were determined by time series comparisons of postharvest and preharvest regressions. Trends for daily maximum and mean stream temperature significantly increased after harvest in no tree buffer units. Partial buffers led to slight (<2 °C) or no increased warming. BMP units led to significantly increased warming, slight, or no increased warming. Temperature responses in uncut units appeared to be linked to responses in upstream harvested units. In many instances, when harvested units exhibited significantly higher postharvest trends, lower trends were observed in the uncut units downstream. Stream temperature trends of 7 day moving maxima indicated warming through the no tree buffer units and some of the BMP units. Peaks in maxima were not maintained in downstream units. Stream temperature responses were related to buffer implementation and stream features, relating to cooling and warming.

The effects of forest harvesting and best management practices on streamflow and suspended sediment concentrations during snowmelt in headwater streams in sub-boreal forests of British Columbia, Canada

2003 ◽  
Vol 33 (8) ◽  
pp. 1397-1407 ◽  
Author(s):  
J S Macdonald ◽  
P G Beaudry ◽  
E A MacIsaac ◽  
H E Herunter
Keyword(s):  
British Columbia ◽  
Suspended Sediment ◽  
Best Management Practices ◽  
Boreal Forests ◽  
Management Practices ◽  
Complete Removal ◽  
Sediment Concentration ◽  
Forest Harvesting ◽  
Clear Cut ◽  
Best Management

This paper examines suspended sediment concentration and stream discharge during freshet in three small sub-boreal forest streams (<1.5 m in width) in the central interior of British Columbia for 1 year prior to (1996) and for 5 years following forest harvesting (1997–2001). Harvesting prescriptions in a 20-m strip beside one stream required complete removal of merchantable timber (>15 cm diameter at breast height (DBH) for pine and >20 cm for spruce), while all stems <30 cm DBH were retained beside a second stream. A third stream remained unharvested as a control. The two riparian treatments were prescribed to test the efficacy of current British Columbia legislation that allows for varying amounts of riparian retention as best management practices for the management of windthrow. Both treated watersheds were clear-cut harvested (approximately 55% removal) in January 1997, and in the following year, temporary access roads were deactivated, including two stream crossings in the low-retention watershed. An increase in peak snowmelt and total freshet discharge was first noted in the second spring following harvest in both treatments and remained above predicted in all subsequent years. Suspended sediment also increased during freshet following harvest but returned to levels at or below preharvest predictions within 3 years or less in the high-retention watershed.

Forest harvesting impacts on soil properties and vegetation communities in the Northwest Territories

2002 ◽  
Vol 32 (4) ◽  
pp. 713-724 ◽  
Author(s):  
Michael D Bock ◽  
Ken CJ Van Rees
Keyword(s):  
Species Composition ◽  
Soil Properties ◽  
Forest Harvesting ◽  
Understory Vegetation ◽  
Vegetation Community ◽  
Clear Cut ◽  
Mixedwood Forests ◽  
Crown Cover ◽  
Composition And Structure ◽  
Harvesting Systems

Management of boreal mixedwood forests in Canada has traditionally relied almost exclusively on the clear-cut silvicultural system. In recent years, greater utilization of the hardwood component of boreal mixedwoods and increased societal concerns over maintenance of the integrity and sustainability of these ecosystems has provided impetus for forest managers to consider alternative silvicultural practices in boreal mixedwood forests. Little is currently known, however, concerning the response of soils and vegetation to forest harvesting systems in the mixedwood forests of the Liard River valley, Northwest Territories (NWT). Therefore, the objective of this study was to quantify the effects of patch clear-cut, strip clear-cut, and clear-cut harvesting systems on soil properties and understory vegetation composition and structure. Treatment sites with 3 or 4 years of recovery since harvesting and adjacent uncut forest sites were sampled using transect methodology. Soil samples were collected and understory vegetation community species composition and percent crown cover were assessed in 1-m2 quadrats. Compared with the range of conditions present in the uncut forest, increases in mineral soil bulk density (2%), exchangeable calcium (7%), LFH horizon thickness (13%), pH (0.2 units), and total organic carbon (5%) and decreases in LFH horizon total nitrogen (6%) and exchangeable potassium (22%) were observed following harvesting. Harvesting resulted in the reduction in crown cover of feathermoss species and increased abundance of shrub and herb species and minimal changes to species composition. Multivariate analysis of the data indicated that the method of harvesting did not result in significant differences in species composition and structure of the understory vegetation community. Overall, winter harvesting of these boreal mixedwood sites did not have a major impact on the majority of soil properties evaluated or on the species composition of the understory vegetation community.

Seasonal patterns of soil respiration in intact and clear-cut northern hardwood forests

1994 ◽  
Vol 24 (8) ◽  
pp. 1711-1716 ◽  
Author(s):  
David E. Toland ◽  
Donald R. Zak
Keyword(s):  
Soil Respiration ◽  
Root Respiration ◽  
Microbial Respiration ◽  
Late Summer ◽  
Soda Lime ◽  
Forest Harvesting ◽  
Seasonal Patterns ◽  
Soil C ◽  
Northern Hardwood ◽  
Clear Cut

The flux of CO2 from forest soils is controlled by the respiration of plant roots and soil microorganisms, the rates of which are likely to change following forest harvesting. Root respiration should decrease, whereas microbial respiration should increase, in response to warmer soil temperatures and greater soil C availability following removal of the overstory. We investigated the influence of forest harvesting on seasonal patterns of soil respiration in two different northern hardwood ecosystems. One ecosystem was dominated in the overstory by Acersaccharum Marsh, and Quercusrubra L., and the other by A. saccharum and Tiliaamericana L.; two stands were studied in each ecosystem type. We measured daily rates of soil respiration using the soda-lime technique. Averaged across ecosystems, daily rates of soil respiration did not significantly differ between intact and clear-cut plots, nor did they differ between ecosystems or sites nested within ecosystems. Peak daily rates ranged from 2.75 to 3.00 g CO2-C•m−2•day−1 during mid to late summer in both intact and clear-cut plots. Soil temperature accounted for 43 and 58% of the variation in daily rates for intact and clear-cut plots, respectively. Annual soil respiration rates in intact (478 g CO2-C•m−2•year−1) and clear-cut (470 g CO2-C•m−1•year−1) plots did not differ significantly. Our results suggest that greater rates of microbial respiration in clear-cut plots proportionally offset a decrease in root respiration following clear-cut harvest.

scholarly journals Investigation of the reasons for the failures of the tractor microclimate system

2021 ◽  
Vol 273 ◽  
pp. 07011
Author(s):  
Victor Kataev ◽  
Ilia Markvo ◽  
Kaprel Khubiian ◽  
Valery Dimitrov
Keyword(s):  
Quality Indicators ◽  
Performance Indicators ◽  
Economic Effect ◽  
Significant Error ◽  
Agricultural Machinery ◽  
Assessment Of Performance ◽  
Labour Intensity ◽  
Combine Harvester ◽  
Digital Agriculture ◽  
Harvesting Process

In the process of performing technological operations, any agricultural machinery is exposed to a large number of changing factors. The result of performing technological operations, i.e. the assessment of performance indicators, in most cases, is performed by the organoleptic method, which is characterized by a significant error (up to 40%) and labour intensity. The use of automatic means of control gives an undoubted advantage in convenience of use and in speed of obtaining results. Given the complexity and labour intensity of assessing the quality indicators of agricultural machinery, even partial automation of this process in practice gives a significant (tens of percent) economic effect and becomes the basis for the formation of digital agriculture. We have analyzed the existing methods for controlling the quality indicators of technological operations using the example of the grain harvesting process. In particular, the possibilities of improving the methods of monitoring the quality indicators of the work of the combine harvester are considered.

scholarly journals Organized Access to the Ibero-American Quality Journals: The PPL Experience

2012 ◽  
Vol 4 (1) ◽  
Author(s):  
Ana Maria Cetto ◽  
José Octavio Alonso-Gamboa ◽  
Saray Córdoba González ◽  
Elea Giménez-Toledo ◽  
Guillermo Chávez Sánchez
Keyword(s):  
Case Studies ◽  
Quality Indicators ◽  
Information Sources ◽  
Initial Experience ◽  
Scholarly Journals ◽  
Additional Information ◽  
Relevant Role ◽  
Harvesting Process ◽  
Critical Overview

Abstract: Latindex has created a portal of portals (PPL) aimed at providing free and open organized access to the literature published in Ibero-American scholarly journals. A report on the initial experience with the PPL is presented, with a critical overview of the main features and shortcomings found in the harvesting process. Our findings raise the need for additional information sources in Ibero-America and for the portals to adopt and adhere to technical and editorial standards. Further, the coverage of journals by different systems providing quality indicators is analyzed, based on case studies of journals produced in two countries with different degrees of development. This analysis highlights the relevant role that PPL can play in support of Ibero-American journals and as a tool in evaluation processes.Résumé : Latindex a créé un portail de portails (PPL) destiné à fournir un accès organisé libre et ouvert à la littérature publiée dans les journaux scientifiques ibéro-américains. On présente un rapport sur l'expérience initiale, avec une revue critique des caractéristiques principales et des problèmes rencontrés durant la récolte. On montre la nécessité de sources d'information additionnelles dans la région et que les portails adoptent et suivent des normes techniques et éditoriales. De plus, sur la base d'études de cas dans deux pays de degrés de développement différents, on analyse le traitement de journaux par des systèmes fournissant des indices de qualité. Cette analyse met en évidence le rôle que le PPL peut jouer en plus comme appui des journaux ibéro-américains et comme outil de processus d'évaluation.

Nutrients in Salmonid Ecosystems: Sustaining Production and Biodiversity

2003 ◽  
Keyword(s):  
Pacific Northwest ◽  
Nutrient Dynamics ◽  
Nitrogen Concentration ◽  
Coniferous Forest ◽  
Forest Litter ◽  
Forest Harvesting ◽  
Total Carbon ◽  
Old Growth ◽  
Red Alder ◽  
Clear Cut

<em>Abstract.</em>—One result of clear-cut logging in the Pacific Northwest is that many watersheds are now dominated by riparian stands of red alder <em>Alnus rubra </em>(Bong). This species colonizes disturbed areas quickly and can limit the establishment of coniferous forest species. In the Northwest, inputs of nutrients from decaying salmon carcasses have been reduced with declining salmon runs, and nitrogen-rich red alder litter may provide a critical source of nutrients to streams. We hypothesized that high-nutrient inputs from red alder forests would translate into more productive and nutrient-rich stream ecosystems, compared with streams bordered by coniferous species. Leaf litter inputs and chemistry, surface water chemistry, and seston and periphyton nutrient dynamics were measured in six streams in the Hoh River Watershed on the western Olympic Peninsula, Washington, during 1999–2000; three streams were dominated by riparian red alder and three in old-growth coniferous forest. Litter inputs to a red alder-dominated stream were three times greater than litter into an old-growth stream. Although total carbon concentration was similar, nitrogen concentration of red alder litter was approximately three times greater than coniferous litter. Alder litter concentrations of other limiting elements, such as Ca, Cu, Mg, K, P, and Zn, were also significantly higher than conifer needles. Phosphorus and Mg concentrations of suspended particulate matter were significantly higher in streams dominated by red alder. Periphyton biomass was significantly higher in streams dominated by alder and had increased levels of magnesium. These data suggest that red alder forests may provide important subsidies of limiting elements that fuel food webs in Pacific Northwest streams. This might be especially important in stressed systems, such as those that have experienced drastic resource removal through forest harvesting or reduced salmon runs.

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