Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 16

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

Wyszukiwano:
w słowach kluczowych:  allotment garden
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
Cadmium was determined in the soil of six allotment gardens of Lodz, situated in areas with different traffic patters (the centre of the city and its suburbs). It was determined in the form of cadmium (II) dithizonate by the extraction-spectrophotometric method.
Lead, as a heavy metal, is harmful to living organisms (both plants and animals) and it is relatively mobile in the environment. In this article we present the results of the monitoring of the lead content in local allotment gardens (Zielona Góra, Poland). We examined both the total and the phytoavailable form. Soil samples were collected in eight places in the allotment gardens, and two places in the neighbourhood of the allotment gardens. The lead content in the soil met the Polish soil ground standards (Regulation by the Minister of the Environment of 9.09.2002). The total content of lead varied from 21 to 39 mg kg⁻¹, (12–14 mg kg⁻¹ at reference point) and the form potentially available for plants from 10 to 19 mg kg⁻¹ (6–7 mg kg⁻¹ at reference point). The content of lead does not exceed the threshold values according to Polish law.
This work presents the results of determination of lead in the soils of six allotment gardens located in different parts of the city (in the centre and on the outskirts). Lead was determined spectrophotometrically in the form of pink lead(II) ditizonate.
During the years 1984-1990, red beet, carrot and parsley were cultivated in four selected allotment gardens situated near the Płock Petrochemical Works (central Poland). Leaves and roots were harvested, dried and analysed for nine heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) and two forms of sulphur (total and sulphate). The accumulation of the heavy metals (except copper) was much higher in vegetable leaves than in the roots. This was especially true for manganese, iron, lead and chromium. Only two metals, cobalt and copper, were gathered in normal concentrations in all samples. Iron, chromium and cadmium were accumulated in above-normal amounts in all analysed vegetable organs. Overall, the contents of iron, chromium, zinc and nickel found in the examined vegetables were harmful for them. Total sulphur and sulphate sulphur showed highest levels in carrot leaves. In this organ both forms of sulphur occurred in amounts which were harmful to the plants. In general, the quality of examined vegetables, considering the accumulation of heavy metals and sulphur, was low because of very high levels of iron and chromium.
The present work is a continuation of our research on the content of heavy metals in the soil of allotment gardens located in the area of ód. It presents results of the determination of bioavailable and total iron in the soil collected in two allotment gardens in the city. Iron was determined spectrophotometrically in the form of red-pink complex of Fe(II) and 2,2'-dipyridine. The method of determination recommended by the Polish Standards has been modified by using hy­droxy­lamine instead of glycin to reduce Fe(III) to Fe(II).
The vegetation of allotment gardens is an important element of urban green areas and constitutes a habitat where many groups of insects exist, including aphids. This research involved the monitoring of winged morphs of aphids in allotment gardens in the area of Poznań with the use of Moericke traps. The fauna structure of aphids in two large allotment gardens was demonstrated by comparing the activity of winged morphs of aphids in 2000–2001 and 2014–2015. The vegetation of these gardens was accompanied by the rich fauna of aphids. For four growing seasons, 113 species or groups of aphid species were captured with the traps. Major changes were reported in the structure of the collected fauna in the period of time when the research was conducted. The differences concerned particular positions of collected species in aphid communities. The abundance of Anoecia corni, Aphis sambuci, Phorodon humuli and Periphyllus testudinaceus increased, and now hold the position of subdominants of the communities, whereas Myzus persicae and Hyalopterus pruni decreased in comparison with the situation more than ten years ago. Rhopalosiphum padi still remains an eudominant in the communities. The main reason for this phenomenon is thought to be due to changes in the vegetation composition of gardens because the gardens are being used differently. The production function has changed to recreation.
Research was carried out in 1998 on the area of 10 allotments situated within the limits of the city of Lublin. Representative soil samples, as well as samples of white cabbage and carrot roots were collected. Content of lead, zinc, and copper were analysed in the samples. On the basis of chemical analysis, it was observed that quantities of lead and zinc were usually higher than average in the same type soils in non-polluted areas. Copper content in the soil did not exceed the average values. The natural content of metals was usually not exceeded in plants. However, samples of white cabbage taken from the "Nasza Zdobycz" and "Sygnał" allotments, where the amount of lead was higher than I mg kg-1 of dry mass were an exception.
In the years 1984-1990 soil and ground water quality was defined in selected allotment gardens of Płock (central Poland) and in a household garden situated in a village about 25 km from the town. In soil, analysis covered the level of accumulation of heavy metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn), and total sulphate sulphur and total nitrogen, and in ground water the metals mentioned above, as well as sulphate sulphur and nitrate nitrogen. These pollutants were accumulated in soil in mostly permissible amounts except for zinc and sulphate sulphur, which occurred in excessive amounts in all gardens. The soil pollution level in analyzed gardens did not decrease proportionally to the increasing distance from the Petrochemical Works. In all gardens an excessive accumulation of sulphate sulphur, iron, lead, cadmium, manganese and copper in ground water was noted, while chromium, nickel and cobalt appeared in nondetectable amounts. The pollution of ground water had some tendency to decrease with increasing distance from the works; however, this evidently applied only to iron.
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.