Plant and microbial uptake and allocation of organic and inorganic nitrogen related to plant growth forms and soil conditions at two subarctic tundra sites in Sweden
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Plant and microbial uptake and allocation of organic and inorganic nitrogen related to plant growth forms and soil conditions at two subarctic tundra sites in Sweden. / Sørensen, Pernille Lærkedal; Clemmensen, Karina Engelbrecht; Michelsen, Anders; Jonasson, Sven Evert; Ström, Lena.
I: Arctic, Antarctic, and Alpine Research, Bind 40, Nr. 1, 2008, s. 171-180.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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T1 - Plant and microbial uptake and allocation of organic and inorganic nitrogen related to plant growth forms and soil conditions at two subarctic tundra sites in Sweden
AU - Sørensen, Pernille Lærkedal
AU - Clemmensen, Karina Engelbrecht
AU - Michelsen, Anders
AU - Jonasson, Sven Evert
AU - Ström, Lena
PY - 2008
Y1 - 2008
N2 - In order to follow the uptake and allocation of N in different plant functional types andmicrobes in two tundra ecosystems differing in nutrient availability, we performed a 15Nlabelingexperiment with three N forms and followed the partitioning of 15N labelamong plants, microorganisms and soil organic matter. At both sites the deciduousdwarf shrub Betula nana and the evergreen Empetrum hermaphroditum absorbed added15N at rates in the order: NH4+ . NO32 . glycine, in contrast to the graminoid Carexspecies which took up added 15N at rates in the orderNO32 . NH4+ . glycine. Carextransported a high proportion of 15N to aboveground parts, whereas the dwarf shrubsallocated most 15N to underground storage. Enhanced 13C in Betula nana rootsrepresents the first field evidence of uptake of intact glycine by this importantcircumpolar plant. Plant and microbial uptake of label was complementary as plantstook up more inorganic than organic N, while microbes preferred organic N. Microbesinitially took up a large part of the added label, but over the following four weeksmicrobial 15N decreased by 50% and most 15N was recovered in soil organic matter,while a smaller but slowly increasing proportion was retained in plant biomass.
AB - In order to follow the uptake and allocation of N in different plant functional types andmicrobes in two tundra ecosystems differing in nutrient availability, we performed a 15Nlabelingexperiment with three N forms and followed the partitioning of 15N labelamong plants, microorganisms and soil organic matter. At both sites the deciduousdwarf shrub Betula nana and the evergreen Empetrum hermaphroditum absorbed added15N at rates in the order: NH4+ . NO32 . glycine, in contrast to the graminoid Carexspecies which took up added 15N at rates in the orderNO32 . NH4+ . glycine. Carextransported a high proportion of 15N to aboveground parts, whereas the dwarf shrubsallocated most 15N to underground storage. Enhanced 13C in Betula nana rootsrepresents the first field evidence of uptake of intact glycine by this importantcircumpolar plant. Plant and microbial uptake of label was complementary as plantstook up more inorganic than organic N, while microbes preferred organic N. Microbesinitially took up a large part of the added label, but over the following four weeksmicrobial 15N decreased by 50% and most 15N was recovered in soil organic matter,while a smaller but slowly increasing proportion was retained in plant biomass.
U2 - 10.1657/1523-0430(06-114)[SORENSEN]2.0CO;2
DO - 10.1657/1523-0430(06-114)[SORENSEN]2.0CO;2
M3 - Journal article
VL - 40
SP - 171
EP - 180
JO - Arctic, Antarctic, and Alpine Research
JF - Arctic, Antarctic, and Alpine Research
SN - 1523-0430
IS - 1
ER -
ID: 8379002