Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 41

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  skaly macierzyste
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Investigations of the cultivated field climate and its complex evaluation require determining soil conditions in which the above research is based on. The maintenance of soil retention capacity, water filtration rate, gas exchange between atmospheric and soil air, and soil temperature dynamics are considerably conditioned by the physical state of the soil and its properties. The object selected for the study is located in the field of the agrometeorological observatory at Felin, near Lublin on brown earth, of a grey-brown type (Orthic Luvisol), derived from silt formations, non-uniform on chalk marl. Granulometric composition of the soil classifies it within loamy silt formations. Soil contains a medium amount of organic carbon (980 mg/100 g of soil) in the arable layer. The soil reaction is acid (pH 4.85), and the saturation of sorption complex with basic cations is higher then 50 %. Compaction of the plough-humus layer reaches on average 1.39 g/cm⁻³, and total porosity exceeds 45 % v/v. Field water capacity is higher than 26 %, w/w, while field air capacity is 7.9 % v/v. Wilting point of plants corresponds to water capacity at pF 4.2 and accounts for 5.8 % w/w on the average. The content of water-stable aggregates, valuable from the agronomic point of view, i.e., bigger than 1 mm in diameter exceeds 22 % w/w. The soil analyses did not show any signs of gleying or other unfavourable signs limiting the possibility of cultivation of basic plant species.
The study focused on the influence of several soil properties and forest species composition on spatial distribution of organic carbon stock in soils developed from the contrasted parent materials: Tertiary claystones and sandstones, and Qurternary sands of different origins. Soil sampling was performed on 110 plots, while forest mensuration was conducted on 82 ones. The content of <0.05 mm fraction determined by the type of parent material played a key role in the distribution of carbon stock in soils. Higher content of fine fraction favoured the accumulation in mineral part of soil, while higher sand content had an indirect influence on accumulation of carbon in the organic horizon. Forest species composition and biomass volume are more important for C accumulation in the O horizons. Taking into account the geological heterogeneity, the size of investigation area played a prominent role for the statistical significance of the observed correlations between carbon stocks and the other soil properties.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 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.