Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Zastosowanie metod wielowymiarowych do oceny współzależności cech użytkowych ziarna i mąki wybranych odmian pszenicy ozimej

100%

Gregorczyk A., Smagacz J., Hury G., Ulasik S.

Colloquium Biometricum

|

2008

|

tom 38

2

Wielowymiarowa analiza danych w ekonomice rolnictwa

100%

Kisielinska J., Stanko S.

Roczniki Nauk Rolniczych. Seria G: Ekonomika Rolnictwa

|

2009

|

tom 96

|

nr 2

3

Subsydia i efektywność ekonomiczno-finansowa a typ produkcyjny gospodarstw osób fizycznych

100%

Kulawik J., Plonka R.

Zagadnienia Ekonomiki Rolnej

|

2014

|

nr 3

The type of farming of a family agricultural holding very clearly differentiates its economic and financial efficiency and the possibility of the use of budget support. The performed calculations of multiple regression showed that the subsidy rate in the form of the ratio of the sum of financial support received and the income from the family agricultural holding influenced the effectiveness mostly negatively, significantly statistically. The impact of other variables from the category of subsidising holdings on economic and financial indices was not so clear when it came to the direction of the interdependence, although it met the generally accepted criteria for statistical significance in most of the cases. The same phenomenon was observed with the technical and economic production characteristics as a determinant of efficiency. In this context, it still remains a major challenge to identify the factors that influence the operating efficiency of family agricultural holdings.

4

Sąsiedztwo i następstwo gatunków drzew w Białowieskim Parku Narodowym

80%

Gazda A., Miscicki S.

Sylwan

|

2018

|

tom 162

|

nr 03

The diversity and sustainability of species composition are important topic of forest research. The possibility to observe the coexistence of tree species in a given forest patch and their succession in the next generation is limited because there are few forests unaffected by management activities. For this reason, the study was conducted in the oldest part of the Białowieża National Park, called Strict Reserve. The purpose of the research was to determine the relationship between the quantity of individual tree species in the overstorey (the standing volume of trees with the diameter at breast height d≥8 cm) and regeneration layer (the total height of trees with the diameter at breast height d<8 cm or height h≤1.3 m) as well as the relationships between those stand layers. Multiple regression and canonical analysis were used to determine the relationships between 12 tree species (tab. 1). The research material was the results of measurements of 920 concentric sample plots conducted in 1995 and 2005. In the overstorey, the correlation coefficient between the standing volume of a given tree species on sample plots and the standing volume of other tree species assumed for each species both significant positive values (species ‘co−occurrence’), significant negative values (species ‘avoidance’) and close to zero values (fig. 1). The same was true for the regeneration layer (fig. 2). In eight cases the correlation between the total height of trees of a given species in the regeneration layer and the standing volume of trees from the overstorey showed the highest positive values when referred to the ‘regeneration−overstorey’ relationship of the same species (fig. 3). The same referred to the ‘overstorey−regeneration’ relationship (fig. 4). Eight of the canonical variables turned out to be significant (tab. 2). For the first canonical variable, standing volume of hornbeam in the overstorey (Gb_m) showed the highest absolute value of the loading factor in the first dataset, while the variable the total height of hornbeam trees in the regeneration layer (Gb_o) – in the other dataset (fig. 5). The total redundancy was 20.7%, which means that such part of the variance of the total height of individual tree species in the regeneration layer could be explained by their standing volume in the overstorey. The sequence of tree generations understood as the relationship between species composition of the regeneration and overstorey layers was associated with life strategies of tree species.

Ograniczanie wyników

1 Colloquium Biometricum

1 Roczniki Nauk Rolniczych. Seria G: Ekonomika Rolnictwa

1 Sylwan

1 Zagadnienia Ekonomiki Rolnej

1 Gazda A.

1 Gregorczyk A.

1 Hury G.

1 Kisielinska J.

1 Kulawik J.

1 Miscicki S.

1 Plonka R.

1 Smagacz J.

1 Stanko S.

1 Ulasik S.

1 2018

1 2014

1 2009

1 2008

Zastosowanie metod wielowymiarowych do oceny współzależności cech użytkowych ziarna i mąki wybranych odmian pszenicy ozimej

Wielowymiarowa analiza danych w ekonomice rolnictwa

Subsydia i efektywność ekonomiczno-finansowa a typ produkcyjny gospodarstw osób fizycznych

Sąsiedztwo i następstwo gatunków drzew w Białowieskim Parku Narodowym