Wyniki wyszukiwania

1

Response of greenhouse tomato to increased plant densities and defoliation

100%

Miszalski Z., Mydlarz J., Libik A.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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1989

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tom 37

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nr 4-6

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Improved methods of classification of multispectral aerial photographs: evaluation of floodplain forests in the inundation area of the Danube

86%

Bucha T., Slavik M.

Folia Forestalia Polonica. Series A . Forestry

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2013

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tom 55

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nr 2

The Gabčíkovo hydroelectric power plant has significantly influenced Danube water regime, thus the condition of floodplain forests in the region. Forest condition has been regularly monitored since 1995 using aerial photos. The subject of this study was to improve the procedure of floodplain forest health evaluation based on digital multispectral aerial images. Firstly, the forest mask was created with overall accuracy 89%, and next, tree health was evaluated using defoliation as health indicator. We applied orthogonal transformation of 4 original bands of multispectral imagery into two-dimensional space. Marginal values of digital numbers (DN) of the first component (New Synthetic Channel – NSC1) were defined by fully foliated willow and poplar. The second component (NSC2) was optimised for damage estimation. Calculated DN values of NSC2 represented a perpendicular distance from the line of DN values of the first component. The distance from the line was proportionate to tree damage extent in a given pixel. We generated linear regression model between pair values of NSC2 and defoliation evaluated for 38 trees in the field, respectively, from aerial photos. A decline prediction resulted in r-square equal 0.86. Finally, we used the model to predict defoliation for each picture element (pixel) of the component NSC2.

3

Scots pine (Pinus sylvestris L.) crown condition in the Lubin Forest District (Wroclaw RDSF) in years 2002-2004

86%

Jaszczak R., Niziolek K., Przybylski P.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2007

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tom 06

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nr 3

4

The study of the causal agents of massive needle fall in blue spruce

86%

Werner M., Fruzynska-Jozwiak D., Andrzejak R.

Roczniki Akademii Rolniczej w Poznaniu. Ogrodnictwo

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2001

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tom 34

5

Biomass allocation, compensatory growth and internal C/N balance of Lolium perenne in response to defoliation and light treatments

72%

Wang L., Wang J., Liu W., Gan Y., Wu Y.

Polish Journal of Ecology

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2016

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tom 64

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nr 4

Light environments can have a considerable influence on how plants respond to defoliation through influencing the biomass allocation patterns and internal C/N ratio. Seedlings of Lolium perenne, a common perennial grass species, were grown for eight weeks under three different light environments (natural light, red light and shading) and two different defoliation treatments (no defoliation versus 50% aboveground biomass removal). This study was conducted to examine (1) the effects of light regimes and defoliation on biomass accumulation, biomass allocation and internal C/N ratio status in plants; (2) how the light regimes influence the pattern of compensatory growth after defoliation; and (3) the relationship between compensatory growth and the internal C/N ratio status. We found that red light altered the shoot-to-root allometry, enhanced the leaf C concentrations and induced N deficiency. By contrast, the leaf N concentrations of L. perenne were greater during shading treatment, which simultaneously enhanced shoot growth and stopped root growth. Under defoliation, red light increased shoot growth, not at the expense of root growth, which was not the same as in natural light and shading treatment. Moreover, regardless of the unclipped (no defoliation) and defoliation conditions, the L. perenne biomass partitioning between roots and shoots was significantly correlated with the leaf N concentrations and C/N ratio, indicating that allometric biomass allocation can be largely modulated by signals related to the C and N status of the plants. These results demonstrated that the leaf C and N status would be an appropriate indicator of compensatory growth after defoliation.

6

Vitality of European beech (Fagus sylvatica L.) at the limit of its natural range in Poland

72%

Dobrowolska D.

Polish Journal of Ecology

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2015

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tom 63

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nr 2

The European beech is a major component of central European forests, and the eastern limit of its range lies in Poland. However, the Holocene migration of the beech is not yet finished, especially in NE Poland, so the northern distribution of the beech continues to change. The main goal of this study was to determine if the beech will reach its northern limit in the future. The investigation was carried out in 18 beech stands in Poland. To study the status of the health of the trees, circular plots were established in grids of different sizes. The basal beech stand area ranged from 3.7 m² ha⁻¹ to 31.2 m² ha⁻¹. The density of trees exceeded a hundred trees per hectare in most of the plots (61%), and the average degree of defoliation was not greater than 60% in all of the investigated stands. Environmental conditions influenced defoliation of beech trees (Fisher's test, F = 4.0204; P <0.0001). The vitality of the beech trees varied between stands (Kruskal-Walis test, H = 139.7433, P <0.0001) and was rather good in 56% of the study plots. Seedlings and saplings were observed in all of the investigated stands, and they covered from 5 to 39% and 21 to 80% of the study plots, respectively. Spontaneous beech regeneration was widespread and differed from stand to stand as well as within stands in all of the study plots. The number of tall seedlings in most of the study plots (56%) was greater than 10,000 individuals per hectare. The factors limiting beech regeneration were stand density and herb cover, and the number of beech seed trees influenced the quantity of small seedlings. Beech tree density positively influenced the number of small seedlings, and the strength of the correlation was moderate and statistically significant (Pearson correlation, r = 0.349). Beech tree density influenced the vitality of tall and small saplings (Pearson's correlations, r = 0.673 and r = 0.361, respectively). The spontaneous regeneration and strong vitality of seedlings and saplings suggests that beech can create stable stands in the future and that it is an expansive tree species both within its continuous range and at the limit of its distribution. It is quite possible that beech will reach its north-eastern limit in Poland in the future.

7

Evaluation of oak tree conditions on the basis of losses in the assimilation aparatus of selected oak stands in Sulecin Forest District

72%

Szewczyk W., Dudek M., Baranowska M.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2011

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tom 10

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nr 3

Oak trees play a significant naturalistic and economic role. Common oaks represent the most valuable forest-creating species in Poland. In the recent years, on the area of the whole country, one can observe a visible deterioration of the health conditions in oak tree stands. It is difficult to indicate the main factor responsible for this phenomenon. Because of the wide range of this observation, it can be assumed that this process is caused by many biotic and abiotic, as well as anthropogenic factors. Studies were out in the Sulęcin Forest District. At the turn of July and August in the years 2009 and 2010, an assessment of the losses in the majority of trees showed a medium degree (49%). Another group of trees showed 36% of leaf loss, while 14% of oak trees did not show any losses at all. A very high degree of defoliation was found only in 1% of trees. The presented data indicate that an average loss in the assimilation apparatus of oak trees amounted to 29.15%.

8

Application of a synthetic tree damage index to assess changes in the health condition of selected oak stands in the Wloszakowice Forest Division

72%

Kuzminski R., Wtyklo R.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2014

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tom 13

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nr 2

The paper presents an evaluation of health condition of selected oak stands in the Włoszakowice Forest Division based on a synthetic tree damage index. Field work was conducted in 2007-2008. In order to perform this task seven experimental sites were established, with 25 trees from Kraft’s age classes I-III evaluated in each. It was found that the overall health condition of most stands deteriorated in 2008 in comparison to 2007.

9

Crown defoliation of trees of common pine [P.sylvestris L.] of different kraft classes in the evaluation of forest health condition

72%

Jaszczak R.

Forestry

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1999

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tom 02

10

Tree crowns condition of the main scots pine [Pinus sylvestris L.] tree stand in some selected forest division in 2003

72%

Jaszczak R., Golojuch P.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2004

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tom 03

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nr 2

11

Wplyw pozycji biosocjalnej i wieku drzew sosny zwyczajnej [Pinus sylvestris L.] na defoliacje ich koron w strefie uszkodzen slabych

58%

Jaszczak R., Jankowski P., Maliszak L.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2003

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tom 02

|

nr 1

27-45

12

Wplyw stresu mechanicznego na wymiane gazowa oraz wzrost roslin rzodkiewki zwyczajnej i rzepaku jarego

58%

Blamowski Z. K., Michalek W., Rukasz I.

Acta Scientiarum Polonorum. Hortorum Cultus

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2003

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tom 02

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nr 1

3-11

The effect of mechanical stress (partial defoliation and/or shoot decapitation) were studied on gas exchanges and growth of radish and rapeseed plants. Removal of older leaves increased transpiration rate (E) but it didn’t have any influence on net photosynthesis rate (Pn). Shoot decapitation and defoliation of young leaves didn’t influence the Pn of radish but it greatly decreased photosynthesis rate of rapeseed plants. The stress also changed pattern of assimilates distribution and the organs’ growth. In radish plants photoassimilates were translocated to hypocotyls whereas in rapeseed they were mostly used for the growth of leaves and roots. It is concluded that mechanical stress plays important role in sink/source regulation. In this way it has an influence on gas exchange, biomass distribution and the growth of plants. That processes also depend on the types (donor or acceptor) and age of defected organs and plants cultivars.

13

Charakterystyka defoliacji korony drzew sosny zwyczajnej [Pinus sylvestris L.] roznych klas biosocjalnych

58%

Jaszczak R.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2002

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tom 01

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nr 2

13-24

14

Zmiana stanu koron sosny zwyczajnej [Pinus sylvestris L.] w Nadlesnictwie Doswiadczalnym Siemianice

58%

Jaszczak R.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2002

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tom 01

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nr 1

35-43

15

Effect of canopy density on the defoliation of the European silver fir (Abies alba Mill.) due to heavy industrial pollution

58%

Filipiak M., Napierala-Filipiak A.

Dendrobiology

|

2009

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tom 62

17-22

Until recently, the level of industrial air pollution in the Sudetes (a mountain range extending on the Czech Republic and Poland border) was very high.This caused a large-scale forest decline, especially in the western part of the Polish Sudetes: in the Izerskie and Karkonosze Mts. An analysis of data on fir defoliation in that area, collected directly after the period of heavy industrial pollution, showed a clear dependence of the degree of defoliation of the primary crown on canopy density: the lower the density, the higher the degree of defoliation.

16

Radial growth response of Scots pine [Pinus sylvestris L.], black pine [Pinus nigra Arnold], and black alder [Alnus glutinosa [L.] Gaertn.] to the nun moth [Lymantria monacha L.] outbreak in the Slowinski National Park and the Damnica Forest District [Northern Poland]

58%

Bednarz B., Kochanowski D.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2010

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tom 13

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nr 2

17

Shea (Vitellaria paradoxa C.F. Gaertn.) seedlings showed impressive recovery after defoliation

58%

Ugese F. D., Ezechukwu P. T., Ogbaje C.

International Letters of Natural Sciences

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2015

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tom 37

Experiments to determine the effect of seed size, watering interval and defoliation on growth and dry matter attributes of seedlings of shea butter tree were conducted at Makurdi, Nigeria, from July 2010 to April, 2012. In the first experiment, treatments were made up of three seed size categories described as small (5-10g), medium (11-15g) and large (16-20g) and three watering intervals of 3, 6 and 9 days. In the second experiment, treatments comprised three watering intervals of 3, 6 and 9 days and three levels of defoliation – 0, 50 and 100%. In both experiments, factorial combinations of the treatments were laid out in completely randomized design (CRD) and replicated three times. Results of analysis of variance showed that in the first experiment seed size significantly influenced root length with the medium and large seeds producing seedlings with comparatively longer roots than the small seeds. The most frequently watered seedlings (3 and 6 days) produced more leaves than those watered less frequently (9 days). Seed size influenced dry weight of root and total (whole plant) dry weight with the medium and large seeds recording significantly higher values than the small seeds. Watering interval however did not significantly influence any of the other traits. Seed weight exerted significant influence on amount of dry matter partitioned to the stem and the root. More dry matter was partitioned to the stem by the small seeds. Conversely, medium and large seeds allocated more dry matter to the root than to the stem. In the second experiment, defoliation level only influenced total fresh weight, dry weight of root and total dry weight in favour of plants with half their leaves removed. None of the traits examined were significantly influenced by watering regime. Interaction between defoliation level and watering regime significantly influenced total fresh weight, dry weight of root and total dry weight. Generally seed size had more influence on seedling characters than watering interval. Seedlings also demonstrated remarkable ability to overcome effects of defoliation.

18

Assessment of influence of age of trees and dust fall on defoliation of the Scotch pine in the region of Opole and some neighboring territories using Bayesian approach

58%

Golabek E., Tukiendorf A.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

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2001

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tom 04

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nr 2

The paper presents an ecological analysis of the defoliation of Scotch pines in relation to the age of trees, and the dust fall in the immediate environment. The Bayesian modeling of empirical data was proposed here via MCMC technique known as Gibbs sampling in the BUGS software. The usefulness of the methodology was accentuated in such ecological assessments.

19

Effect of the local contamination emitter on the tree crowns condition of the Scots pine [Pinus sylvestris L.] main stand in Przedborow Forest Division

58%

Jaszczak R., Golojuch P.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2003

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tom 02

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nr 2

20

Crown state of Scots pine trees [Pinus sylvestris L.] in selected forest divisions of the Legnica-Glogow Copper Mining Centre [LGOM]

58%

Jaszczak R., Golojuch P.

Forestry

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2002

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tom 05

Ograniczanie wyników

Response of greenhouse tomato to increased plant densities and defoliation

Improved methods of classification of multispectral aerial photographs: evaluation of floodplain forests in the inundation area of the Danube

Scots pine (Pinus sylvestris L.) crown condition in the Lubin Forest District (Wroclaw RDSF) in years 2002-2004

The study of the causal agents of massive needle fall in blue spruce

Biomass allocation, compensatory growth and internal C/N balance of Lolium perenne in response to defoliation and light treatments

Vitality of European beech (Fagus sylvatica L.) at the limit of its natural range in Poland

Evaluation of oak tree conditions on the basis of losses in the assimilation aparatus of selected oak stands in Sulecin Forest District

Application of a synthetic tree damage index to assess changes in the health condition of selected oak stands in the Wloszakowice Forest Division

Crown defoliation of trees of common pine [P.sylvestris L.] of different kraft classes in the evaluation of forest health condition

Tree crowns condition of the main scots pine [Pinus sylvestris L.] tree stand in some selected forest division in 2003

Wplyw pozycji biosocjalnej i wieku drzew sosny zwyczajnej [Pinus sylvestris L.] na defoliacje ich koron w strefie uszkodzen slabych

Wplyw stresu mechanicznego na wymiane gazowa oraz wzrost roslin rzodkiewki zwyczajnej i rzepaku jarego

Charakterystyka defoliacji korony drzew sosny zwyczajnej [Pinus sylvestris L.] roznych klas biosocjalnych

Zmiana stanu koron sosny zwyczajnej [Pinus sylvestris L.] w Nadlesnictwie Doswiadczalnym Siemianice

Effect of canopy density on the defoliation of the European silver fir (Abies alba Mill.) due to heavy industrial pollution

Radial growth response of Scots pine [Pinus sylvestris L.], black pine [Pinus nigra Arnold], and black alder [Alnus glutinosa [L.] Gaertn.] to the nun moth [Lymantria monacha L.] outbreak in the Slowinski National Park and the Damnica Forest District [Northern Poland]

Shea (Vitellaria paradoxa C.F. Gaertn.) seedlings showed impressive recovery after defoliation

Assessment of influence of age of trees and dust fall on defoliation of the Scotch pine in the region of Opole and some neighboring territories using Bayesian approach

Effect of the local contamination emitter on the tree crowns condition of the Scots pine [Pinus sylvestris L.] main stand in Przedborow Forest Division

Crown state of Scots pine trees [Pinus sylvestris L.] in selected forest divisions of the Legnica-Glogow Copper Mining Centre [LGOM]