Wyniki wyszukiwania

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Effects of vegetation cover and slope length on nitrogen and phosphorus loss from a sloping land under simulated rainfall

100%

Qian J., Zhang L.-P., Wang W.-Y., Liu Q.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 3

In order to evaluate the effects of different slope lengths (1, 2, 3, 4, and 5 m) and different vegetation coverage ratios (20%, 45%, 60%, and 90%) on the mechanisms of nutrient loss and runoff producing processes, we have conducted 14 simulated rainfall experiments. The results show that N and P loss are decided by the concentration and the runoff volume, but when the amounts of N and P in topsoil are small, their loss content mostly depends on runoff volume. Dissolved nitrogen is the main form in the nitrogen loss, while nitrate nitrogen is the main component in dissolved nitrogen, but the proportion in the total nitrogen gradually decreases with slope length increasing or with the increase of vegetation cover; the main form of phosphorus losses is particulate phosphorus, and the excessive sediment-bound nutrient loss released into water might cause secondary pollution of an aquatic environment.

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Laboratory determination of potential interception of young deciduous trees during low-intense precipitation

84%

Klamerus-Iwan A., Sporysz M.

Folia Forestalia Polonica. Series A . Forestry

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2014

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tom 56

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nr 1

The research issue focuses on potential interception, which is the maximum amount of water that can be stored on plant surface. Tests under controlled conditions remain the best way to enhance knowledge on interception determinants in forest communities. Such tests can provide data for identification of mathematical models based on ecological criteria. The study presented in this paper concerned tree interception under simulated rain in a range from 2 to 11 mm/h. To perform the experiment a set of sprinklers was designed and built. The study included two deciduous species: beech (Fagus sylvatica L.) and oak (Quercus robur L.). Descriptive characteristic and nonlinear estimation were suggested for the obtained data. Interdependence of potential interception, the intensity of rain and the size of raindrops were described using exponential equation. The intensity and drop size of simulated rainfall significantly influence the obtained values of potential interception. Data analysis shows a decrease of interception value with an increase of intensity of simulated rainfall for both analysed species. Every run of the experiment that differed in the intensity and size of raindrops reached an individual level of potential interception and time needed to realize it. The formation of ability of plants to intercept water depends both on the dynamics and the time of spraying.

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Teoretyczne i praktyczne aspekty metodyki badan nad zatrzymywaniem wody opadowej przez poziomy organiczne gleb lesnych w warunkach symulowanych opadow

67%

Kucza J.

Acta Agraria et Silvestria. Series Silvestris

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2003

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tom 41

25-37

The prerequisite of conducting investigations on the water retention ability of the organic layers of forest soils in case of simulated rainfall was developing of appropriate methods of sampling and methods of conducting the experiment. The basic assumptions need: 1. botanical uniformity of analyzed samples, 2. the way that the samples are collected, including the succession of soil layers and slope inclination, 3. unification of the conditions for conducting experiments in respect to the intensity and duration of rainfall and the length of breaks between consecutive rainfalls, 4. conducting investigations within the entire range of moisture contents of soil samples.

Ograniczanie wyników

1 Acta Agraria et Silvestria. Series Silvestris

1 Folia Forestalia Polonica. Series A . Forestry

1 Polish Journal of Environmental Studies

1 Klamerus-Iwan A.

1 Kucza J.

1 Liu Q.

1 Qian J.

1 Sporysz M.

1 Wang W.-Y.

1 Zhang L.-P.

2 2014

1 2003

Effects of vegetation cover and slope length on nitrogen and phosphorus loss from a sloping land under simulated rainfall

Laboratory determination of potential interception of young deciduous trees during low-intense precipitation

Teoretyczne i praktyczne aspekty metodyki badan nad zatrzymywaniem wody opadowej przez poziomy organiczne gleb lesnych w warunkach symulowanych opadow