USDA Forest Service - Research Papers PNW-RP最新文献_第7页

The influence of relative humidity on fires in forests of Central Poland 相对湿度对波兰中部森林火灾的影响

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0027

K. Konca-Kedzierska, K. Pianko-Kluczyńska

{"title":"The influence of relative humidity on fires in forests of Central Poland","authors":"K. Konca-Kedzierska, K. Pianko-Kluczyńska","doi":"10.2478/frp-2018-0027","DOIUrl":"https://doi.org/10.2478/frp-2018-0027","url":null,"abstract":"Abstract The purpose of the present work was to answer the question of how and to what extent information about low air humidity in a selected area can be used in determining the fire risk. The central region as defined in the Classification of Territorial Units for Statistics (NUTS) was selected for the study, because this classification is also used in the National Fire Information System, which provides data on the number of forest fires. Data on humidity for a given region were taken from the synoptic or climatic station of The Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB) located in the region. Two independent experiments were conducted based on various methodological assumptions. In experiment A, the main focus was on humidity deficit, as defined by nine different indicators. Using the relative risk and the Jaccard index, their connection to fire cases of third class or higher was studied. A class reconstruction of the number of fires was also carried out using the fuzzy analogues method, and the obtained reconstructions were evaluated using cross-correlation indicators in contingency tables. In experiment B, correlation relationships between the number of fires and the annual characteristics of relative humidity were studied. In order to use the association measures in the cross-tabulation tables, the number of fires and humidity characteristics were categorised using quantiles. The relationship between the number of fires and the percentage share of low-humidity (<40%) days in the year was tested using the Mann–Whitney test. The obtained values of the examined correlation indices and the analysis of correlation relationships emphasise the important role of relative humidity dynamics in determining the fire risk.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85006579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Efficiency evaluation in forest management – a literature review 森林经营效率评价——文献综述

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0029

W. Mlynarski, A. Kaliszewski

{"title":"Efficiency evaluation in forest management – a literature review","authors":"W. Mlynarski, A. Kaliszewski","doi":"10.2478/frp-2018-0029","DOIUrl":"https://doi.org/10.2478/frp-2018-0029","url":null,"abstract":"Abstract The aim of our work was to give an overview on efficiency evaluation in forest management as described in the literature. Here we present definitions for efficiency and productivity of economic entities as well as categories of efficiency evaluation methods and discuss ratio analysis, parametric and non-parametric approaches to measure efficiency in forestry. With regards to ratio analysis, we focused on reports employing this approach in Poland due to the abundant literature on this subject. On the other hand, studies based on parametric and non-parametric approaches for efficiency evaluation in the forest sector have only been used occasionally in Poland and thus this part of our analysis is based on research done abroad. The most important parametric method is the Stochastic Frontier Approach (SFA), while the most important non-parametric approach involves Data Envelopment Analysis (DEA), which was developed at the end of the 1970s and utilizes a mathematical programming algorithm. Our review shows that efficiency evaluation in forest management in Poland so far is mostly based on ratio analysis. However, although those methods are of considerable practical importance, in terms of scientific development they are now being replaced by more mathematically and statistically advanced parametric and non-parametric methods, which also open up more opportunities to analyze the efficiency of forest management. The first research employing non-parametric DEA recently published in Poland is a good step towards improving research quality and provides comprehensive results for the efficiency evaluation of forest management.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83029136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Forest policy goals in Poland in light of the current forestry aims in Europe Part 3. European priorities for the forest policy in Polish programmes and strategies 根据欧洲目前的林业目标，波兰的森林政策目标第3部分。波兰方案和战略中关于森林政策的欧洲优先事项

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0021

A. Kaliszewski

{"title":"Forest policy goals in Poland in light of the current forestry aims in Europe Part 3. European priorities for the forest policy in Polish programmes and strategies","authors":"A. Kaliszewski","doi":"10.2478/frp-2018-0021","DOIUrl":"https://doi.org/10.2478/frp-2018-0021","url":null,"abstract":"Abstract The aim of the paper is to review and evaluate Polish programmes and strategies centred on and related to forest, as well as national and transregional development strategies and priorities formulated at the european level. this work covers the ‘National Forest Policy’ and 28 other strategies, policies and programmes representing various forest-related policy areas, including environmental protection, agriculture and rural development, climate and energy as well as development strategies from 1997 to 2017. The study shows that many of the priorities of the European forest policy have not been reflected in the ‘National Forest Policy’. These include, among others, adapting forests to climate change and enhancing their mitigation potential, enhancing the economic contribution of forestry to rural development, enhancing the role of the SFM in a green economy, securing the participation of all stakeholders in forest-related decision-making processes, improving communication in forestry and developing cross-sectoral cooperation. However, many of these forest-related issues have already been included in numerous strategic documents of other policy areas. As a result, many European forest policy priorities are scattered across Polish policy documents of different forest-related sectors and it raises justified concerns that inconsistencies and contradictions exist between them. Another matter of significant concern is that the issue of forests and forestry is barely mentioned in any of the examined development strategies. This may also indicate that the forest sector is getting more and more marginalized in the socioeconomic and political sector, as forest policy goals are defined and achieved within other policy areas and are practically absent in national and transregional development strategies.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82915366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Density dynamics, diet composition and productivity of sparrowhawk Accipiter nisus L. population in central Poland 波兰中部雀鹰种群密度动态、食性组成和生产力

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0024

J. Gryz, D. Krauze‐Gryz

{"title":"Density dynamics, diet composition and productivity of sparrowhawk Accipiter nisus L. population in central Poland","authors":"J. Gryz, D. Krauze‐Gryz","doi":"10.2478/frp-2018-0024","DOIUrl":"https://doi.org/10.2478/frp-2018-0024","url":null,"abstract":"Abstract Long-term monitoring of raptor populations can serve as a proxy for the evaluation of whole ecosystem health. The aim of the study was to compare the current abundance of the sparrowhawk Accipiter nisus L. with data from past decades. Additionally, we examined the diet of this species in the breeding season and recorded the number of fledglings. The study area encompassed 105 km2 of field and forest mosaic, located in the vicinity of the Rogów village (51°49'17,98''N, 19°53'54,5''E). Forests covered approximately 24% of the area and formed eight individual complexes ranging in size from 65 ha to 1000 ha. In the years 2011–2017, an average of 20.1 sparrowhawk pairs were recorded resulting in a population density of 19.1 pairs per 100 km2 of total area and 8.2/10 km2 of forested area. This is an increase of 26% compared to the years 2001–2003, when only 16 pairs nested in the same study area. Each successful pair of sparrowhawk produced between one and five fledglings with the average being 3.4. Larch Larix spp. and Scots pine Pinus sylvestris L. dominated as nesting trees accounting for 36.9 and 35.9% of nesting sites respectively. The average age of the nesting trees was 31 years and nests were built at an average height of 11.7 m. The sparrowhawk diet was dominated by birds, which amounted to 81.5% of prey items and over 95% of the consumed biomass. Among the birds identified to the species level, the domestic pigeon Columba livia f. domestica Gm. constituted the biggest share in biomass. Further important prey items were starling Sturnus vulgaris L., with 5.6% of prey items and 9.8% of the total biomass, and hawfinch Coccothraustes coccothraustes (L.), with 6.3% of prey items and 7.6% of the total biomass. Sparrowhawks also consumed significant numbers of thrush Turdus spp. that formed in total over 11% of the total consumed biomass. It would appear that the observed population growth was a result of prohibited persecution and the ban on DDT usage in agriculture.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83269893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The influence of riparian woodlands on the thermal conditions of small lowland streams during the summer 夏季河岸林地对低地小溪流热条件的影响

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0023

Maksym Łaszewski, Wojciech Kiryla

{"title":"The influence of riparian woodlands on the thermal conditions of small lowland streams during the summer","authors":"Maksym Łaszewski, Wojciech Kiryla","doi":"10.2478/frp-2018-0023","DOIUrl":"https://doi.org/10.2478/frp-2018-0023","url":null,"abstract":"Abstract Riparian woodlands significantly affect the water quality of streams and rivers. Thus, we examined whether the presence of woodlands in riparian buffer zones also impacts the thermal characteristics of lowland streams during the summer. Water temperature data were recorded with digital temperature loggers located in eight quasi-natural sites across the Garwolin Plain in central Poland. The mean, maximum, minimum, and mean daily range parameters were calculated for the whole study period from July to September 2017 with a 30 min. resolution. The percentage of woodlands in the catchment area and buffer zone along the streams was estimated based on satellite images from the Sentinel-1 and Sentinel-2 missions. The Random Forest method was used in the classification process with an accuracy of 96%. The similarity of measurement sites in terms of water temperature was determined using cluster analysis (Ward method), while a Spearman correlation coefficient was applied to compare thermal parameters with the percentage of woodland areas. The results indicate that water temperature patterns across the measurement sites varied, with mean temperatures ranging from 14.4°C in site T8 to 16.3°C in site T1. Furthermore, the correlation analysis confirmed our hypothesis that the presence of woodland areas does not significantly alter the thermal parameters of lowland streams. Moreover, the cluster analysis showed that sites with significantly different percentages of woodland areas were closely linked due to the similar distributions of water temperature values. However, it must be emphasised that the lack of riparian woodlands in buffer zones does not exclude the presence of shade associated with shrubs and grasses, as well as aquatic plants. In consequence, more advanced indicators of riparian shade, such as vegetation mapping using unmanned aerial vehicle (UAV) or hemispherical photography, should be used for small lowland streams.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84191567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The influence of initial tension on blunting of chain saw blades and cutting efficiency 初始张力对链锯片钝化及切割效率的影响

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-09-01 DOI: 10.2478/frp-2018-0026

A. Maciak, Magda Kubuśka

{"title":"The influence of initial tension on blunting of chain saw blades and cutting efficiency","authors":"A. Maciak, Magda Kubuśka","doi":"10.2478/frp-2018-0026","DOIUrl":"https://doi.org/10.2478/frp-2018-0026","url":null,"abstract":"Abstract The initial tension of the chainsaw is a decisive factor in making the operator’s work more efficient and at the same time it is a parameter that the operator can adjust and thus affect significantly. This article presents the results of research aimed at determining the impact of the initial chain tension on the blunting of the blade and the cutting efficiency. Two tree species, pine and oak, were examined in our research, which enabled us to also compare the effect of the wood hardness on blade blunting. the wood tested in this study was fresh wood. The measurements were carried out with two different degrees of chain tension: tensioned and loose. We found that both, tension and wood hardness, significantly affect the rate of blunting of the saw blades. The dulling occurs more intensively when working with a loose chain and sawing wood with greater hardness. In the case of too small tension on the saw chain, blunting may occur even more than twice as fast compared to working with a properly tensioned saw. The initial tension and tree species also affect the cutting efficiency with too small an initial tension reducing cutting efficiency.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79830730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Running in forest areas – an analysis of activities undertaken by State Forests 在森林地区跑步——国家森林开展的活动分析

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-06-01 DOI: 10.2478/frp-2018-0017

M. Ciesielski

{"title":"Running in forest areas – an analysis of activities undertaken by State Forests","authors":"M. Ciesielski","doi":"10.2478/frp-2018-0017","DOIUrl":"https://doi.org/10.2478/frp-2018-0017","url":null,"abstract":"Abstract A growing need to lead a healthy lifestyle and to spend more time in nature causes an increased pressure on forests, which renders their social functions more and more important. In order to meet people’s expectations, the State Forests undertake several actions to make forests more available to the public including the organization of running events in forests and the development of a network of recreational and running paths. In order to describe these actions, an online survey was conducted among the workers of forest districts. Additional data such as information published on the State Forests’ website, Facebook and runners’ blogs, was included in the analysis as well. 283 forest districts participated in the electronic survey. The results indicate that the State Forests actively participated in promoting running events in forests totaling 488 running events in 2014 and 779 between January and October 2017, which constitutes an increase by approximately 60%. The average number of running events in the forest districts during the analysed period was 9.5. Most of them took place in forest districts within city agglomerations and in the mountains. The State Forests supported over 20% of running events organised in the areas they administer. They had also started numerous initiatives (such as ‘Wolność w naturze’, ‘Zielony punkt kontrolny’ and ‘BiegamBoLubię Lasy’) that were evaluated positively by their participants (according to Facebook). In conclusion, it is clear that the State Forests do promote recreation in forests and forest education by supporting public events.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90381513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency and thickness of snow cover at the foot of the Babia Góra Massif in the winter seasons 1960/61 to 2014/15 1960/61 ~ 2014/15冬季巴比亚Góra山脚下积雪频率和厚度

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-06-01 DOI: 10.2478/frp-2018-0014

Paweł Franczak

{"title":"Frequency and thickness of snow cover at the foot of the Babia Góra Massif in the winter seasons 1960/61 to 2014/15","authors":"Paweł Franczak","doi":"10.2478/frp-2018-0014","DOIUrl":"https://doi.org/10.2478/frp-2018-0014","url":null,"abstract":"Abstract The aim of the study was to gain knowledge about changes in the nival conditions prevailing in the lower part of the Babia Góra massif in the winter, during the period from 1960/61 to 2014/15. The performed analyses concerned the daily snow cover thickness in the winter seasons of the years 1960/61–2014/15, and were based on data recorded by a meteorological station established by the Institute of Meteorology and Water Management – National Research Institute (IMGW-PIB) in Zawoja (697 m altitude). The study was focused on the period from the first to the last day of the appearance of the snow cover in the season. Based on long-term measurements carried out in in Zawoja, it was found that the average length of the occurrence of snow cover with the thickness of ≥ 1 cm was 104 days, which showed variability in individual seasons that ranged from 47 days in 2013/14 to 145 days in 1993/94. It was noted that the period of snow cover occurrence was shortened – from 118 days in the decade 1960/61–1969/70 to 96 days in the recent decade (2000/01–2009/10). The potential duration of snow cover was on average 157 days. The snowiest months were February and January, when snow cover occurred for 81% and 75% of all the observation days, respectively. The largest thickness of snow cover was recorded during these two months, with the maximum of 178 cm (January 30, 1976). In contrast, snow cover was not observed in July, August and September. The studied multi-year period was characterised by high variability of the winter snowiness index: from 1.61 in 2013/14 to 8.00 in 1962/63. In the period 1960/61–2014/15, in Zawoja, there was observed the distinct periodicity (16–19 years) with regard to the number of days with snow cover, the average and total snow cover and the winter snowiness.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76908997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The extraction process and seed quality of silver fir cones Abies alba Mill. 研究了银杉球果的提取工艺及种子质量。

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-06-01 DOI: 10.2478/frp-2018-0016

M. Aniszewska, J. Brzózko, W. Zychowicz

{"title":"The extraction process and seed quality of silver fir cones Abies alba Mill.","authors":"M. Aniszewska, J. Brzózko, W. Zychowicz","doi":"10.2478/frp-2018-0016","DOIUrl":"https://doi.org/10.2478/frp-2018-0016","url":null,"abstract":"Abstract Fir cones Abies alba Mill. are not as extensively described in the literature as cones of other species, and therefore, there is no description of the changes in water content and their dynamics during the extraction process. Developing a mathematical model describing these changes based on cone parameters and air temperature is a step forward in determining the optimal conditions for the extraction process. here, we present such a model derived using fresh cones collected in a seed production stand in the Zwoleń Forest District (RDSF Radom). For 120 randomly chosen cones, the length and the largest diameter of the cone were measured, using the Multiscan program. in addition, for 60 randomly selected cones, the diameter was measured along the entire length of the cone at 10 mm intervals. this allowed us to generate cone models approximating rotational solids for which the outer surface area was calculated using a fourth degree polynomial function and the obtained area was then used to determine cone volume. to facilitate the generalization of surface area and volume calculations to other cones, the ks1 and ks2 coefficients were derived, which simplified the employed formulas without significantly affecting accuracy. Analogous analyses were also performed for cone stems, which allowed the process of seed extraction from cones to be described by mathematical equations. The stem of the cone was found to constitute 2.6% of its volume and 4% of its dry mass. An exponential equation was used to describe the change in cone mass during the seed extraction process, in which the parameters are the initial and final water content of the cone and power factor b, which is a function of cone thickness. The energy content and germination rate for the extracted seeds were determined 14 and 28 days after sowing. The seeds obtained in the investigated extraction process did not reach first grade quality.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90083105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Variability of hygro-climatic conditions of forest vegetation in Poland during the period of 1951–2015 1951-2015年波兰森林植被水文气候条件的变率

USDA Forest Service - Research Papers PNW-RP Pub Date : 2018-06-01 DOI: 10.2478/frp-2018-0015

M. Siedlecki

{"title":"Variability of hygro-climatic conditions of forest vegetation in Poland during the period of 1951–2015","authors":"M. Siedlecki","doi":"10.2478/frp-2018-0015","DOIUrl":"https://doi.org/10.2478/frp-2018-0015","url":null,"abstract":"Abstract This work presents an assessment of changes in the hygro-climatic conditions determining the vegetation and productivity of forest areas. Selected indices such as the radiant index of climate aridity – RIA, optimal precipitation – Popt, critical value of precipitation – Pkrt and CVP index (Climate, Vegetation, Productivity), which describe annual biomass and wood production under climatic conditions, were used. The analysis is based on standard meteorological measurements taken from 21 stations from the period of 1951–2015. The daily data were employed to calculate the previously mentioned indices, and the next linear trend coefficient was used to assess changes in hygro-climatic conditions. The results show an increasing tendency towards dry climate conditions (positive values of the RIA linear trend coefficient) in a large part of the area consisting of Wielkopolska, the Silesian lowlands, and southern Poland. These areas are also characterized by the fastest increase in the most favourable sum of precipitation Popt and critical precipitation Pkrt for forest vegetation. This means that water resources in the environment and hygro-climatic conditions important for vegetation and the productivity of forest vegetation are deteriorating. On the other hand, the results of the CVP change assessment show an improvement in the climatic conditions influencing vegetation and forest productivity. The greatest positive changes of the CVP index are observed in the areas of south-eastern Poland.","PeriodicalId":35347,"journal":{"name":"USDA Forest Service - Research Papers PNW-RP","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83038232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1