Wyniki wyszukiwania - AGRO

1

Analysis of the impact of climate factors on the level of mechanical parameters of selected packaging films used for food products

100%

Cholewa-Wojcik A.

Polish Journal of Natural Sciences

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2017

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tom 32

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nr 1

Plastic films are of key importance as a group of materials used for packaging food products. It is therefore crucial that they meet specific functional and durability requirements as well as comply with all regulations regarding food contact materials. A degree to which a set of properties of these materials satisfies the requirements connected with their usage determines their functional value. The level of functional value depends to a large extent on climate factors affecting these materials in the post-production stage. The aim of this work was to analyze the effect of climate factors on the level of changes of the parameters characterizing the functional value of polyolefin packaging films used for food products. The research was conducted with the main focus on the scope and intensity of changes of selected properties of packaging films in different microclimate conditions. The results became the basis of assessing the impact of climate factors on the level of changes of the parameters characterizing functional value and served as a groundwork to the analysis of the correlation between the changes in the parameters and the level of functional value of the plastic films.

2

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Slope aspect and altitude effect on selected soil organic matter characteristics in Beskid Mountains forest soils

86%

Staszel K., Blonska E., Lasota J.

Folia Forestalia Polonica. Series A . Forestry

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2021

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tom 63

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nr 3

3

Phenological observations of selected species from the genus Syringa L. (Oleaceae) in the botanical garden of the Adam Mickiewicz University in Poznań

86%

Sowelo M., Antkowiak W.

Steciana

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2017

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tom 21

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nr 2

Phenological observations at the Botanical Garden of the Adam Mickiewicz University in Poznań were conducted on Syringa komarowii, S. meyeri, S. microphylla, S. oblata, S. reticulata, S. tomentella and S. wolfii. These observations showed the longest foliation phase in the case of S. oblata and S. meyeri, while the longest flowering phase was recorded in S. reticulata, S. microphylla and S. wolfii. Additionally, the longest period of anthesis (i.e. the period from the moment when 25% flowers bloomed to the time when 75% were out of bloom) was observed in S. oblata and S. microphylla. All examined shrubs, except for S. oblata, set fruits, which dispersal was extended to the next year (except for S. komarowii). In terms of decorative value suitable for green areas the most valuable species were S. komarowii, S. reticulata, S. meyeri, S. microphylla and S. oblata, with the three latter being the most showy shrubs in terms of autumn foliage. Moreover, S. komarowii was exceptional among the analysed species due to its large, attractive leaf blades. This lilac, together with S. meyeri, was also characterised by the most decorative inflorescences. Thanks to their stronger growth in comparison to the other species, S. komarowii, S. oblata and S. reticulata are best suited for large gardens, whereas S. meyeri and S. microphylla will prove most suitable for small gardens. All the recommended shrubs show good drought resistance.

4

Metody arkhitekturno-stroitel'nykh reshenijj teplovaja effektivnost' zdanijj

86%

Kulikov G., Kaz'mina A.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2014

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tom 16

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nr 5

5

Age and climate sensitivity of radial growth of Picea crassifolia to climate in a transitional climatic zone in Northwest China

86%

Zhang L., Jiang Y., Zhao S., Zhang W.

Polish Journal of Ecology

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2018

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tom 66

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nr 2

Study of the radial growth response to climate factors at different tree ages is essential for predicting forest dynamics and formulating correct management policies. In this study, we analysed the growth responsiveness of Picea crassifolia to climate conditions, and evaluated its relationship to tree age at the individual tree scale, in the transitional zone between regions affected by the East Asian monsoon and winds blowing from the west (westerlies) in the Qilian Mountains. On three study sites, 150 cores were taken from 75 trees. Pearson correlation coefficients were calculated between the standardized tree-ring series of each core (and chronology) and climatic factors which were utilized to research the climate-growth relationships. Quadratic polynomial fitting was used to test the relationships between tree age, chronological parameters, and the radial growth response to climate. Radial growth was positively influenced by total precipitation for the previous July-September and the current May-July. Additionally, radial growth was negatively correlated with the total monthly precipitation for the current September, and the mean monthly temperature for the previous July. Trees younger than 80 years old showed a stronger response to accumulative precipitation in the previous July-September, those older than 160 years old showed a stronger response to precipitation at the end of current growing season, while those of 140–160 years old showed a weaker response to precipitation in the current May-July.

6

Evaporation from water surface as climatic indicator to estimate mountain grassland evapotranspiration

86%

Misztal A., Zarzycki J.

Acta Agrophysica

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2016

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tom 23

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nr 2

This paper presents a study on the evaporation of water from the surface in the area of the Lesser Pieniny Mts., determined on the basis of measurements at the climatic-lysimetric station in Jaworki. The evaporation of water from the surface is diversified in specific 10-day periods and months of the vegetation season, and the total for April-September was 334.1 mm. The quantity of evaporating water was lower than the measured reference evapotranspiration, assumed to be the evaporation of a well-watered, compact grassy sward, and lower than the reference evapotranspiration calculated in accordance with the Penman formula in French modification and the Penman-Monteith formula. In the area of the Lesser Pieniny Mts., the evaporation of water can be expressed as a function of the deficit of air humidity and – to a lesser extent – of air temperature. The seasonal plant coefficients kc determined on the basis of evaporation from open water surface Ew can be used successfully to determine the evapotranspiration of mountain grassland.

7

The impact of climatic conditions of spring flood formation on hydrograph shape of the Desna River

86%

Khrystyuk B., Gorbachova L., Koshkina O.

Meteorology Hydrology and Water Management. Research and Operational Applications

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2017

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tom 05

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nr 1

Climatic factors are the most important of all the factors that influence the hydrograph shape of a river; this is because they are dynamic in space and time. The presence of hydrographs with a similar shape in long-term observation series of water runoff indicates that from time to time in the catchment of a river the same conditions of water runoff formation repeat. This is due to the cyclicity of climatic and – as a consequence – hydrological processes. The classification of hydrographs based on the similarity of their shapes on the Desna River (observation period 1885- 2010) was carried out using the geometrical similarity criterion (ρ) and the average Euclidean distance between values of hydrograph pairs (η). 41 classes of hydrographs, which included from 1 to 6 hydrographs, were obtained. Among them were determined 12 classes with low probability, 9 classes with medium probability and 20 classes with high probability. An analysis of the conditions of hydrograph formation for each of the identified classes was performed for the following factors: the sums of daily air temperatures and precipitation during the period of positive air temperature (from July) and the period of negative air temperatures, and also during the period of temperature transition through 0ºC up to the peak discharges, index of depth of soil freezing, index of snow water equivalent, index of soil moisture content, and index of snowmelt. In general, hydrographs which are included in one class have similar climatic conditions to those of water runoff formation. However, in some cases, a combination of different values and dynamic factors can lead to the formation of similar hydrograph shapes.

8

Analysis of climatic factors affecting the size and efficiency of the thermal energy storage system

86%

Bakon T., Obstawski P.

Annals of Warsaw University of Life Sciences - SGGW. Agriculture

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2017

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nr 70

9

Interannual variation of the growing season maximum normalized difference vegetation index, MNDVI, and its relationship with climatic factors on the Tibetan Plateau

72%

Wang S.-H., Sun W., Li S.-W., Shen Z.-X., Fu G.

Polish Journal of Ecology

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2015

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tom 63

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nr 3

The effects of the growing season climatic factors (i.e., temperature, precipitation, vapor pressure and relative humidity) on the growing season maximum normalized difference vegetation index (MNDVI), which can mirror the aboveground net primary production and the vegetation maximum absorbed ability of photosynthetically active radiation, were examined during the period from 2000 to 2012 on the Tibetan Plateau. The effects of climatic factors on the MNDVI changed with vegetation types, which was probably due to the fact that the changes of climatic factors differed with the type of vegetation. There was a significant increasing trend for the spatially averaged MNDVI of the vegetation area over the entire plateau. Approximately 16 and 3% of the vegetation area demonstrated a significant MNDVI increasing and decreasing trend, respectively. The MNDVI was significantly affected by relative humidity and vapor pressure, but not affected by temperature and precipitation over the entire plateau. Our findings suggested that the environmental humidity played a predominant role in affecting the variation of MNDVI over the entire Tibetan Plateau.

10

Foliar responses of Abie fargesii Franch. to altitude in the Taibai Mts, China

72%

Xu P., Zhang X., Zhao C., Chen L., Gao X., Yao B., Deng J., Deng Y.

Polish Journal of Ecology

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2014

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tom 62

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nr 3

Physiological and ecological adaptations of altitudinal gradients reveal alpine plants’ ecological and evolutionary responses to environmental changes. Here we quantitatively investigated the variation in the foliar physiological and morphological traits of alpine tree species (Abies fargesii) along the altitudinal gradient in the Taibai Mountains, China. We collected the needle samples of Taibai fir (A. fargesii) from seven sites at altitudes of 2550, 2650, 2750, 2850, 2950, 3050 and 3150 m, respectively, and measured the 12 foliar physiological and morphological traits. Each set of needle sample (100 needles) was randomly selected from the upper- third of A. fargesii canopies. The results showed that leaf mass per unit area (LMA), stable carbon isotope composition (δ13C), stomatal rows (SR), leaf carbon concentration per unit area (Carea), leaf nitrogen concentration per unit leaf mass (Nmass) and area (Narea) linearly increase significantly while stomatal density (SD), number of stomata per unit nitrogen concentration (St/N) and per unit leaf mass (St/LM) decrease with the altitudes raise. Moreover, all measured traits presented both strong correlations and significantly linear relationships with the main climate factors such as the mean temperature, rainfall and relative humidity during the growing season as well as the altitudes, except for leaf free water concentration (LWC), leaf carbon concentration per unit leaf mass (Cmass) and C: N ratio. The patterns of foliar traits in response to altitudes imply that the alpine plants need higher cost (e.g. higher nutrient concentration) to adapt to the harsher environments along altitudinal gradient. Moreover, our results show that the variation patterns of the leaf traits for A. fargesii plants should be driven by the interactions of multi-climate factors because the abiotic factors that directly influence the growth of plants covary with the increasing altitudes.

11

Altitudinal gradients in a volcanic island: effect on biodiversity and species richness of the dipteran fauna

72%

Ferreira T., Ribeiro E., Duarte-Rodrigues P., Boavida M.-J.

Polish Journal of Ecology

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2012

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tom 60

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nr 3

Although research on environmental gradients is relatively common, the altitudinal gradient is one of the least explored. The discrepancies between earlier studies attributing highest diversity to lowest altitude and more recent studies where this altitudinal pattern is not maintained justify the pertinence of investigating the way diversity gradually changes with altitude. The studied altitudinal gradient is located inside the volcanic cone, on one of volcanic island Azores, and the investigated altitudes were 450, 600 and 800 meters a.s.l. Malaise traps were used to capture insects and Diptera were selected for this study. Application of the Zipt-Mandelbrot model to rank-abundance curves of Diptera sampled at three different altitudes, as well as analyses of richness, diversity and evenness, led to the conclusion that medium altitude was the stratum with the highest niche diversity, the highest specific diversity and the highest predictability. Non-metric multidimensional scaling allowed an excellent separation of the three altitudes sampled, suggesting that habitat characteristics significantly differ with altitude. The study, undertaken in a volcanic island of the Azores, Atlantic Ocean, will have heuristic interest to the scientific community in general and especially to those researchers studying environmental gradients. The results of this research will underpin further work on the insect biodiversity in the Azores Archipelago.

12

Phenology of the wild service tree (Sorbus torminalis (L.) Crantz] in Poznań and Wielkopolski National Park

72%

Bednorz L., Urbaniak A.

Dendrobiology

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2005

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tom 53

3-10

In this paper the results of the 3-year observations (2001–2003) of seasonal rhythm of S. torminalis trees growing in Poznań in Dendrological Garden of Agricultural University and in forests of Wielkopolski National Park are presented. The observations included the course of leaf development, leaf coloration and leaf fall as well as flowering, fruit ripening and fall. Sixteen phenophases were taken into account. The differences in timing and duration of S. torminalis phenophases from year to year, between two sites and among trees within the same site are pointed out and discussed.

13

Kierunki zmian zachwaszczenia - szanse i zagrozenia

72%

Krawczyk R.

Progress in Plant Protection

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2005

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tom 45

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nr 1

233-241

14

Climatic factors affecting development and yielding of grapevine in Central Poland

72%

Lisek J.

Journal of Fruit and Ornamental Plant Research

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2008

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tom 16

285-293

15

Leaf morphology shift of three dominant species along altitudinal gradient in an Alpine meadow of the Quinghai - Tibetan Plateau

72%

Zhong M., Wang J., Liu K., Wu R., Liu Y., Wei X., Pan D., Shao X.

Polish Journal of Ecology

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2014

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tom 62

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nr 4

It has been observed that leaf morphology shift within species is linked to climate change, but there are few studies on the effects of altitude change on leaf morphology of species. We hypothesized that similar to climate change, a morphological shift within species would occur over time under different growing altitudes. In this study, we evaluated three dominant grass species: Elymus nutans Griseb., Kobresia capillifolia Clarke., Carex moorcroftii Boott., taking advantage of the altitudinal variations (3000-4000 a.s.l.) on the Qinghai-Tibetan Plateau. Our study showed that almost all leaf traits of these three species had significant differences (P <0.05) across an altitudinal gradient. Different species responded differently to altitude change. Leaf thickness (LT) of the three species increased with increase in altitude. Leaf area (LA) of E. nutans and C. moorcroftii decreased with increasing altitude, but that of K. capillifolia increased. There was no obvious linear effect on leaf dry matter content (LDMC) and specific leaf area (SLA) of these three species. LDMC of E. nutans and C. moorcroftii showed a trend of increase, while that of K. capillifolia decreased. SLA of E. nutans and K. capillifolia showed a trend of increase, but that of C. moorcroftii decreased with increase in altitude. In addition, soil pH (pH) and air temperature (AT) decreased with increase in altitude. However, other soil and climate factors increased as altitude increased. The finding of this work is that leaf morphology shift within species happens under altitude change to adapt to specific environment.

16

Information and communication technology: a variable tool for mitigating climate change and improving crop production

72%

Magawata D.

International Letters of Natural Sciences

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2014

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tom 13

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nr 2

17

Traffic, machinery, soil and climatic factors in grassland compaction

72%

Douglas J. T., Fortune R. A., Forristal P. D.

Bibliotheca Fragmenta Agronomica

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1997

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tom 2A

18

The impact of soil tillage methods on crops yield and soil density

72%

Fotyma M., Lipiec J., Naglik E.

Bibliotheca Fragmenta Agronomica

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1997

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tom 2A

19

Agrometeorologic and agronomic factors and their response to spring barley productivity

72%

Szwejkowski Z., Wanic M.

Fragmenta Agronomica

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1995

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tom 12

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nr 2

20

Take-off behaviour and effects of weather on the migration of the Silvereye [Zosterops lateralis]

72%

Chan K.

The Ring

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1995

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tom 17

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nr 1-2

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