Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 18

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Aluminium content in overground plant parts and roots determined with ASA and colorimetric methods were compared in this work. High coefficients of determination between two methods were stated. The contents determined with the colorimetric method were higher than determined with the ASA method. Up to 300 mg Al/kg (low concentrations) there were big differences according to the method used.
Investigations were conducted to determine the impact of urban environment and cultivation on the content and fractional composition of humus in anthropogenically transformed soils of selected convent gardens in Cracow. Convent gardens in Cracow, mostly utilised as vegetable gardens, are located in densely built up city areas. On the basis of conducted research, it was established that hortisols of studied gardens are characterised by a high abundance of good quality humus. Humines and humic acids prevail over fulvic acids in humus compounds of these soils. Value of C:N ratio evidences advanced mineralisation of organic matter and good biological activity of soil.
Organic carbon stocks (SOCs) were determined in 14 pedons of the Little and Silesian Beskids (7 from each one: arable land and grassland) and compared with the C-stocks occurring in the soils of Ciężkowickie and Silesian Foothills. They were similar to SOCs in the soils of the Silesian Foothills, but significantly higher than in the soils of the Ciężkowickie Foothills. The participation of SOCs 0–30 cm layer at the stocks of this element in the whole pedon was higher than in the soils of the foothills. Different types of land used (arable land, grassland) did not affect the quantity of SOCs in pedons and layers.
The aim of the present study was to assess the degree of colonization of maize fields by the greater or hedge bindweed, Calystegia sepium L. in the vicinity of Krakow, and to investigate the habitat preferences of this weed. On the basis of field trips, carried out in 88 fields of maize, we found that C. sepium had colonized approximately 30% of the fields investigated. On average, it covered 17.5% of the field area. Multivariate analyses (PCA and RDA) showed that the presence of this species was correlated with that of sandy soils as well as the proximity of streams. Analysis of the morphological features revealed that C. sepium specimens growing both in fields and in natural stands share similar morphological characteristics.
In the work organic C stocks (SOCs) in soils of arable lands and grasslands of Ciężkowickie Foothills were compared. SOC stocks in soils of grasslands were higher than in soils of arable lands in all compared pairs of profiles and soil layers (0-30, 30-60, under 60 cm). Besides way of use, a quantity of SOC stocks and their distribution in soil profiles were influenced by soil textures.
The aim of the investigations was to determine the exchangeable Al in the soils of the pastural glades in the Tatra National Park, as well as to estimate the influence of pH reaction of the investigated soils on the Al accumulation in the plant sward of these glades. Aluminium in the soils was determined in the 1 mol KCl solution after the Sokołow method's, and in the plants after the wet mineralization by the ASA method's. The Al accumulation in the sward (the overground parts and roots) of the pastural glades increases together with the decrease of the pH value and the org. C content in the investigated soils.
17
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Cynk, ołów i kadm w glebach darniowych Podhala

51%
A total content of zinc, lead and cadmium have been determined in the turf soils of the Podhale region. Zn and Pb contents in the mineral soils is not high, as a result of their low content in the parent rocks. A higher content, particularly of Cd, occurs in rendzinas and a gley-podzol ectohumus horizon. An accumulation of the examined metals in the upper horizons in relation to the parent rock, expressed by the accumulation coefficient WA, is considerable, particularly in the case of Cd. The acid reaction of the major part of the examined soils increases risk of the accumulation ot this toxic metal in the ground flora of meadows and pastures.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.