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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Concurrent transport of reactive and non-reactive ions in undisturbed soil columns

100%
Korsunskaia L. P., Shein E. V., Pachepsky Y. A.
International Agrophysics
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2004
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tom 18
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nr 2
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Soil moisture and bulk electrical conductivity variability measured by TDR

86%
Sobczuk H. A., Zhixiong C., Liuzong Z.
International Agrophysics
|
1996
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tom 10
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nr 4
3

Biological soil crusts, plant functional groups, and soil parameters in arid areas of Iran

72%
Bashtian M. H., Sepehr A., Farzam M., Bahreini M.
Polish Journal of Ecology
|
2018
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tom 66
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nr 4
Biological soil crusts (BSCs) have a vital role regarding vegetation and soil development in arid and semi-arid areas in the world, and apparently in Iran, where they comprise more than 85% of the land. In this research, the relationship between BSCs and plant functional groups, considering soil parameters along an arid alluvial fan located in Khorasan Razavi province in northeastern Iran, was examined. The sampling carried out in summer, systematically from apex towards base part of alluvial fan, using a 0.25 m² quadrat over a 5-cm thick soil surface. Surface levels were classified into three categories: apex, middle, and base. At each level, 16 samples were taken; in total 48 samples were collected along the alluvial fan from the apex point to the base district. The results showed a strong relationship between BSCs and the soil surface features, and a weak correlation between the plant functional group and soil parameters. BSCs indicated an ecological evolution from apex to the base geomorphic level by soil development; so that BSCs are more developed on the base of alluvial fan, but their diversity is reduced.
4

Plant-soil feedback in herbaceous species of Mediterranean coastal dunes

72%
Bonanomi G., Esposito A., Mazzoleni S.
Biological Letters
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2012
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tom 49
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nr 1
5

Geostatistical approach to data from field experiments with check plots

72%
Golaszewski J.
Electronic Journal of Polish Agricultural Universities. Series Agronomy
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2002
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tom 05
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nr 2
The paper suggests some indicators for the application of spatial methods in field experimentation. The indicators were based on the data from two field-breeding experiments with pea and field bean. Partially balanced square lattice designs were applied. The Smith’s index of soil heterogeneity b, chemical properties of the soil e.g. pH, Mg, P and K contents as well as data obtained from check plots sown with a single variety were used to evaluate spatial variation across the experiments. The Smith’s index of soil variability b showed a potential as a convenient tool to assess the purposefulness of background variation analysis by applying spatial methods. When b<0.6 one can expect a significantly increased efficiency of the experiment. Therefore the application of the nearest neighbour analysis or kriging to the data obtained from a net of check plots can produce the concomitant variable which can reduce the experimental error effectively.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Wymiar fraktalny gleb torfowo-murszowych o roznym stopniu zmurszenia

58%
Sokolowska Z.
Acta Agrophysica
|
2002
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tom 68
193-204
7

Effect of patchy distribution of soil nutrients on root morphology and biomass allocation of selected grassland species: experimental approach

58%
Zaller J. G.
Polish Journal of Ecology
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2007
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tom 55
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nr 4
Nutrient distribution in natural habitats is usually patchy in space and time, however most knowledge about plant growth and behaviour is based on experiments conducted under spatially homogenous conditions. Evidence has accumulated that the growth and competitive interaction of plant species are strongly affected by heterogeneous rather than homogeneous resource distribution, even when the total resource supply remains similar. For this study it is hypothesized that infestations of grasslands with the nitrophilous weed Rumex obtusifolius L. (broadleaved dock) are partially the consequence of its ability to exploit spatial nutrient heterogeneity. This was tested in a full-factorial pot experiment with homogeneously or heterogeneously distributed nitrogen and/or potassium at either normal or increased soil moisture where R. obtusifolius was grown together with three other grassland species (grass: Arrhenatherum elatius L., non-leguminous herb: Taraxacum officinale Weber, leguminous herb: Trifolium repens L.). The species differed significantly in their root morphology (root length and diameter, specific root length, number of root tips) and biomass allocation response to nutrient distribution, as well as to the nutrient type used to create patches and to soil moisture (e.g., significant species × treatment interactions). Generally, the root system of A. elatius showed the highest plasticity to imposed treatments, followed by T. officinale, R. obtusifolius and T. repens. Unexpectedly, root morphology of R. obtusifolius was unresponsive to soil heterogeneity and less responsive to nutrient type and irrigation than that of the other species. Nutrient type used to create patches influenced the biomass allocation to the root system of R. obtusifolius while nutrient distribution and irrigation showed no effect on biomass allocation. Exploitation of soil nitrate-nitrogen and potassium was similar among species but exploitation was individually affected by nutrient type, nutrient distribution and irrigation suggesting that species-specific differences in nutrient storage capacities in roots or adjustments regarding root nutrient uptake kinetics may play an important role. Results from this study show that R. obtusifolius does not seem to have superior traits to utilize soil nutrient heterogeneity, certain nutrient types or higher soil moisture that differentiates it from the other grassland species tested. The observed effects might have consequences for the long-term competitive relationships between species in the grassland community suggesting that cultural and biological management measures oriented towards the improvement of the competitive ability of co-occurring grassland species might also be important in heterogeneous soils.
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