Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

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
Concentrations of trace elements in organic soils are a result of natural accumulation or due to anthropogenic factors. A field study was carried out in May 2008 on selected sites in the Izera Mountains. Soil samples were collected from 8 profiles of organic soils. Four soil profiles were located on the plateau meadow called Hala Izerska, at the altitude of 835-850 m a.s.l. The other 4 profiles were located in the mountain range known as the Grzbiet Wysoki, at 909-990 m a.s.l. The concentration and pools of heavy metals were determined according to the elevation, depth in soil profile, content of organic matter and soil pH. The content of trace elements (Pb, Cu, Zn) was determined after wet mineralization of samples in nitric acid, using a Flame Atomic Absorption Spectrometer. Pools of trace elements were recalculated into g m–2 in the 0-30 cm layer of soil. The aim was to determine the influence of altitude on concentrations of trace elements in organic soils profiles. Organic soils from the Grzbiet Wysoki and Hala Izerska showed significant contamination, mainly with lead and zinc. The elements were most abundant in surface horizons. With an increasing depth into the soil profile, the content of trace elements decreased. The arithmetic means showed strong dominance of lead on zinc and copper in the examined profiles. The Grzbiet Wysoki, due to its higher location above the sea level, is more exposed to atmospheric deposition of contaminants than Hala Izerska. However, the concentration of Cu is higher in organic soils from Hala Izerska. Statistical analysis showed significant positive correlation between the Pb concentration and altitude. With an increasing altitude, the content of Pb in soil also increased. Zinc and lead correlate highly negatively with the depth into the soil profile. With an increasing depth, the content of these elements decreases.
At the turn of the 19th and 20th centuries large peatland areas of the Stołowe Mountains were drained for the forestry use. The aim of the study was to assess the real impact of the natural (climate) and anthropogenic (forestry drainage) factors on the actual nitrogen mineralization in the shallow organic soils in the Stołowe Mountains National Park (SMNP). For the needs of the study, two research transects were established on the fen peatlands located in the central part of the SMNP. Each transect consisted of three sampling plots. The soil samples for the basic soil properties analysis were sampled in April, while undisturbed soil samples for mineral nitrogen were collected in April (spring), July (summer) and October (autumn) to show the seasonal dynamics of nitrogen mineralization. The obtained results revealed that the currently investigated fen peatland soils were rather slightly affected by the drainage network remains. A vast domination of ammonium over the nitrate form observed in the study soils during the growing season might indicate a periodical soil moisture increase limiting the mineralization process. The amount of precipitation and soil moisture had dominant impact on the N mineralization process, especially on the N-NO₃ concentrations.
Celem badań była charakterystyka właściwości fizycznych oraz zdolności retencyjnych czarnych ziem wytworzonych z piasków występujących na terenie Parku Krajobrazowego „Dolina Bary¬czy", użytkowanych jako grunty leśne. Analizowane gleby reprezentowane były przez 5 profili - (26 próbek glebowych). W pobranym materiale glebowym oznaczono: skład granulometryczny, gęstość właściwą i objętościową, pF w zakresie od 0 do 2,7. W składzie granulometrycznym domi¬nowała frakcja piasku. Gęstość fazy stałej gleby oscylowała w przedziale od 2,32 do 2,76 g • cm-3, gęstość gleby suchej w przedziale od 0,66 do 1,79 g • cm-3, porowatość całkowita od 32,8 do 72,4%. Wartość potencjalnej retencji użytecznej wyniosła od 4,3 do 54,3 %v/v, natomiast efektywna reten¬cja użyteczna wahała się w przedziale od 2,4 do 8,4 %v/v.
This paper describes the fractional composition of humus substances and the physico-chemical and sorptive properties of Mollic Umbrisols Arenic, Mollic Gleysols Arenic and Phaeozems Arenic of the Milicz-Głogów Depression. The following analyses were performed on collected soils samples: granulometric composition, pH in 1mol KCl dm⁻³, hydrolytic acidity (Hh), TOC, Nt, CaCO₃, content of exchangeable cations of alkaline character (Ca⁺², Mg⁺², K⁺ , Na⁺ ) and fractional composition of humus compounds using the Tiurin method. Loamy sand and sand dominate in granulometric composition. Reactions of the soils analyzed ranged from light acidic to alkaline. TOC and Nt content was highly differentiated, and values for the TOC/Nt ratio ranged from 7.9 to 26.9. Alkaline cations dominated in the sorptive complex. Base cations (S) were noted in the range 2.2 – 68.8 cmol(+) kg⁻¹, cation exchange capacity (CECt) in the range 2.8 to 69.4 cmol(+) kg⁻¹ and base saturation (BS) was high, i.e. between 69.8 and 99.4%. In terms of the content of the fractional composition of the analyzed soils, a non-significant part was represented by the fraction Ia (fulvic fraction) which was in the range from 2.8 to 6.2% of TOC. Within humus matter, fraction I dominated (humic compounds bound with calcium and mobile forms of R2O₃) (33.2 – 61.2% of TOC) and within it humic acid. The ratio of CHA:CFA reached the value of 1.1 – 4.2. CHA-Ca (humic acids bonded with Ca) share was placed in the range of 44.1 – 82.8% CHA, while Cpp (post-extraction residue) was in the range of 21.1 – 54.5% TOC.
This work describes the fractional composition of acid formed humus based on physical-chemical and chemical properties in the Mollic Phaeozems Arenic and Mollic Gleysols Arenic. Sand and sandy loam with a decalcification feature dominates in terms of texture. Reactions of the studied soils range from strong light acid to alkaline. The organic O horizon and humic A horizon are very rich in C total. Alkaline character cations, mainly calcium and magnesium, dominated in the absorbing complex. The saturation degree of the sorption complex (BS) is very high in all profiles. With regard to the fractional composition, the Ia fraction represented a small part. Within the humus matter the I fraction dominates. The CHA-Ca (humic acids bonded with Ca) part is very high in both the organic O horizon and the humic A horizon. In turn, the content of non-hydrolyzed C total is minor in the organic O horizon compared with the humic A horizon. The high content of humic acids bonded with Ca (CHA-Ca) as well as strong humidity, the investigated soils favour stabilizing the soil organic matter despite the light texture.
In this paper we presents the characteristics of selected physical and water properties of four arable soils situated within the range of the predicted depression cone of “Tomisławice” lignite open-cast mine. In the sampled soil material of undisturbed and disturbed structure following properties were determined: texture, particle density, bulk density, total porosity, hygroscopic moistures, maximal hygroscopic capacity, saturated hydraulic conductivity, potentials of water bonding in soil, total and readily available waters, total retention in the soil layers of 0-50 and 0-100 cm, drainage porosity and content of organic matter. Study soils were developed from sands, sandy loams and sapric peat material. All of the analyzed soil properties were determined by clay fraction or organic matter content in particular. In the most of the investigated soils high field water capacity and wide scopes of total and readily available water were recorded. Measured saturated hydraulic conductivity was typical for arable soils with similar origin. Study soils showed a precipitation water regime and probably won’t be exposed to drainage degradation caused by open-cast mine.
The aim of this paper was to assess the degradation stage of fen peatland located in the north-western part of the Opolskie voivodeship in accordance with “peatland degradation stages” classification. Understanding of the current state of peatland will be helpful in the future management and possible restoration. Field survey including vegetation and soil research were carried out in May 2013, soil material for laboratory analysis were collected by using “Instorf” peat sampler from four sampling points. Obtained results allowed to classify the study area (located within a larger peatland complex along the Prosna river valley) to minor stage of degrada- tion, with spontaneous changes in vegetation community and soil cover. Only few species of plants typical for fen peatlands were recorded. Moreover, soil cover research did not confirm mursh forming process, typical for strongly degraded peatland areas. Obtained results may indicate that possible future restoration will bring the expected effect. It is very likely, that fen peatland vegetation will regenerate spontaneously, provided that diaspores of the key peat-forming plant species are available in the soil.
The aim of the study was to assess the impact of long-term drainage on the morphology and selected properties of shallow peatland soils in microrelief. The study was conducted within strongly drained peatland (Długie Mokradło bog) located on elevated plateau in the Central Sudetes. The study area is covered by spruce stands introduced by man. Long-term drainage has changed morphology of study soils which were classified as Ombric Fibric Dystric Histosols or Histic Dystric Gleysols. Some peat horizons were strongly silted. The depth of organic materials varied within the range 30-55 cm. Peat humification process showed greater - activity in surface horizons, than in a deeper ones. This phenomenon were especially visible in the shallow places in drainage ditches. Soil reaction was strongly acidic. In soil horizons in old drainage ditches higher values of effective cation exchange capacity (CECe) were recorded, whereas base saturation (BS) did not exceed 20%.
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.