Wyniki wyszukiwania

1

Invasive giant knotweed (Fallopia sachalinensis) alters the composition of oribatid mite communities

100%

Skubala P.

Biological Letters

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2012

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tom 49

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nr 2

2

Geometrical analysis of the soil lump side part disturbed in three directions by the narrow implement

100%

Kuczewski J., Piotrowska E.

Annals of Warsaw Agricultural University. Agriculture

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1998

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nr 33 Agric.Eng.

15-20

3

Results of large-size timber extracting with a grapple skidder

100%

Bembenek M., Mederski P. S., Erler J., Giefing D. F.

Acta Scientiarum Polonorum. Silvarum Colendarum Ratio et Industria Lignaria

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2011

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tom 10

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nr 3

A new HSM 904Z 6WD skidder of a large size was tested in a 140-year-old beech stand in northern Poland. The aim of the study was to analyse machine productivity and impact on the soil (bulk density and cone penetrometer test) and the remaining natural regeneration caused by skidding. Trees were cut by chainsaw and, if possible, felled into the direction of the skidroads. After delimbing, logs with a top diameter of a minimum 7 cm over the bark were prepared. The average skidding operational productivity including piling was 21.0 m3x h-1. At the same time, the level of damage in natural regeneration was: 18% (38% due to both: felling and skidding). An analysis of the soil after skidding showed that the density had grown by 15-30 gx cm-3. Increase of penetration resistance was up to 2.77 MPa as the biggest.

4

Timber harvesting in selected complex cutting in Polish lowlands - results

100%

Suwala M.

Folia Forestalia Polonica. Series A . Forestry

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2002

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tom 44

5

American bison Bison bison wallowing behavior and wallow formation on tallgrass prairie

100%

Coppedge B. R., Shaw J. H.

Acta Theriologica

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2000

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tom 45

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nr 1

We characterized social and spatial patterns of wallowing (dust-bathing) behavior in an American bison Bison bison (Linnaeus, 1758) population on a tallgrass prairie site in Oklahoma, USA. Consistent with earlier studies, wallowing was primarily practiced by adults, Unlike earlier studies, however, aggressive interactions associated with wallowing incidents were rare, probably due to the reduced bullicow ratio in the population. Forty-three significant soil disturbance sites, known as wallows, were created by wallowing activity during the 2-year study. The spatial distribution of wallows was significantly different from overall bison habitat use patterns for some landscape characteristics. Bison preferentially formed wallows on relatively level areas on spring and fall burns, thus avoiding summer burns, unburned areas, and severe slopes. Bison wallowed exclusively on bare or exposed soils when not using wallows, and in many instances wallowed on soil disturbed by other animals. When coupled with a preference for wallowing on relatively coarse soils, bison clearly exhibit a macro- and microsite preference for the conduction of this behavior. This preference has important implications for wallow distribution and their resulting ecological function in prairie environments.

6

Water movement through ploughed and shallow tilled soil blocks

100%

Pitkanen J.

Bibliotheca Fragmenta Agronomica

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1997

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tom 2B

7

Effects of method of soil management on orchard weed occurrence and distribution

80%

Lipecki J., Janisz A.

Electronic Journal of Polish Agricultural Universities. Series: Horticulture

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1999

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tom 02

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nr 2

8

Effects of soil disturbance and disease on the growth and reproduction of Lolium perenne [Poaceae] introduced to semi-natural grassland

80%

Erneberg M., Strandberg B., Strandberg M., Jensen B. D., Weiner J.

Polish Journal of Ecology

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2008

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tom 56

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nr 4

593-604

We performed manipulative field experiments to investigate the effects of soil disturbance and exposure to a fungal plant pathogen, Puccinia coronata (Corda), on the establishment and spread of two introduced, cultivated genotypes of perennial ryegrass, Lolium perenne (L.). The two cultivars of L. perenne with different levels of susceptibility to P. coronata were introduced to grassland sites to investigate whether a plant cultivar selected to resist a pathogen shows better establishment in semi-natural plant communities than a susceptible cultivar. At two sites where L. perenne was already present, the addition of L. perenne seeds had no significant effect on the shoot biomass of the species, indicating that these populations were not seed limited. Exposure to the pathogen resulted in disease, and infected L. perenne populations showed increased shoot biomass over the course of the 3 year experiment and at harvest the final year, but no effect on seed production. Reproductive allocation was not affected by disease exposure in disturbed plots, but decreased in the presence of disease in undisturbed plots. The increased biomass observed in the semi-natural plant communities when exposed to the pathogen contrasts with the reduced biomass observed in garden experiments when the two cultivars of L. perenne were exposed to pathogen attack. The surprising positive effect of P. coronata on biomass in semi-natural communities indicates that processes here are more complex than in more intensively managed production systems.

9

Optimisation of the design and operation capacities of mobile cutting and manipulation system to minimise soil disturbance and contaminant load in forests

80%

Janecek A., Dvorak J.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2002

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tom 05

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nr 2

Ograniczanie wyników

Invasive giant knotweed (Fallopia sachalinensis) alters the composition of oribatid mite communities

Geometrical analysis of the soil lump side part disturbed in three directions by the narrow implement

Results of large-size timber extracting with a grapple skidder

Timber harvesting in selected complex cutting in Polish lowlands - results

American bison Bison bison wallowing behavior and wallow formation on tallgrass prairie

Water movement through ploughed and shallow tilled soil blocks

Effects of method of soil management on orchard weed occurrence and distribution

Effects of soil disturbance and disease on the growth and reproduction of Lolium perenne [Poaceae] introduced to semi-natural grassland

Optimisation of the design and operation capacities of mobile cutting and manipulation system to minimise soil disturbance and contaminant load in forests