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Statements

Subject Item
n2:RIV%2F60076658%3A12310%2F11%3A43879716%21RIV12-GA0-12310___
rdf:type
n4:Vysledek skos:Concept
dcterms:description
Two common plant species of temperate wet grasslands, Carex acuta and Glyceria maxima, were tested for their preferences in the uptake of different nitrogen (N) sources (amino acid, ammonium, nitrate) and their ability to compete for these sources with soil microorganisms. The experiment was a one-day incubation study with plants growing in soil obtained from the field, which was supplied with a solution containing the three N sources, one at a time labeled with (15)N. The bulk of the N demand of both species was covered by nitrate-N, which was the dominant N form in the soil at the time of the experiment. Ammonium-N was taken up less strongly, and organic N formed only a negligible part of their nutrition. The assimilated inorganic N was preferentially transported to apical meristem of the youngest leaf, while organic N remained mostly in the roots. The fast-growing Glyceria took up more N and was a better competitor vis-a-vis soil microbes for rarer N forms than Carex. However, both plants were poor competitors for N vis-A-vis soil microbes, irrespective of the N form. Microbes took up nitrate ca. five times faster and organic N more than a hundred times faster than plants. Correspondingly, the calculated turnover time of microbial N was 17 days, compared to 40 days for N in plant roots. A significant amount of added 15N was found at non-exchangeable sites in the soil, which points to the importance of microbial N transformation and abiotic N fixation for N retention in soil. In summary, the preferential assimilation of inorganic N by the wetland plants studied here and their poor ability to compete for N with soil microbes over the short term agree with the results of studies carried out with other species from temperate grasslands. Two common plant species of temperate wet grasslands, Carex acuta and Glyceria maxima, were tested for their preferences in the uptake of different nitrogen (N) sources (amino acid, ammonium, nitrate) and their ability to compete for these sources with soil microorganisms. The experiment was a one-day incubation study with plants growing in soil obtained from the field, which was supplied with a solution containing the three N sources, one at a time labeled with (15)N. The bulk of the N demand of both species was covered by nitrate-N, which was the dominant N form in the soil at the time of the experiment. Ammonium-N was taken up less strongly, and organic N formed only a negligible part of their nutrition. The assimilated inorganic N was preferentially transported to apical meristem of the youngest leaf, while organic N remained mostly in the roots. The fast-growing Glyceria took up more N and was a better competitor vis-a-vis soil microbes for rarer N forms than Carex. However, both plants were poor competitors for N vis-A-vis soil microbes, irrespective of the N form. Microbes took up nitrate ca. five times faster and organic N more than a hundred times faster than plants. Correspondingly, the calculated turnover time of microbial N was 17 days, compared to 40 days for N in plant roots. A significant amount of added 15N was found at non-exchangeable sites in the soil, which points to the importance of microbial N transformation and abiotic N fixation for N retention in soil. In summary, the preferential assimilation of inorganic N by the wetland plants studied here and their poor ability to compete for N with soil microbes over the short term agree with the results of studies carried out with other species from temperate grasslands.
dcterms:title
Comparison of uptake of different N forms by soil microorganisms and two wet-grassland plants: A pot study Comparison of uptake of different N forms by soil microorganisms and two wet-grassland plants: A pot study
skos:prefLabel
Comparison of uptake of different N forms by soil microorganisms and two wet-grassland plants: A pot study Comparison of uptake of different N forms by soil microorganisms and two wet-grassland plants: A pot study
skos:notation
RIV/60076658:12310/11:43879716!RIV12-GA0-12310___
n4:predkladatel
n19:orjk%3A12310
n3:aktivita
n6:P n6:Z
n3:aktivity
P(GA526/09/1545), Z(MSM6007665801)
n3:cisloPeriodika
6
n3:dodaniDat
n10:2012
n3:domaciTvurceVysledku
n5:2450526 n5:9014632
n3:druhVysledku
n18:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
191305
n3:idVysledku
RIV/60076658:12310/11:43879716
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Amino acids; Ammonium; Nitrate; Plant-microbial competition; Grassland soil; Plant N demand
n3:klicoveSlovo
n11:Grassland%20soil n11:Plant%20N%20demand n11:Plant-microbial%20competition n11:Amino%20acids n11:Ammonium n11:Nitrate
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[14D7B4BEF41B]
n3:nazevZdroje
Soil Biology & Biochemistry
n3:obor
n21:EE
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n14:GA526%2F09%2F1545
n3:rokUplatneniVysledku
n10:2011
n3:svazekPeriodika
43
n3:tvurceVysledku
Kaštovská, Eva Šantrůčková, Hana
n3:wos
000290698100020
n3:zamer
n20:MSM6007665801
s:issn
0038-0717
s:numberOfPages
7
n8:doi
10.1016/j.soilbio.2011.02.021
n15:organizacniJednotka
12310