Effects of litter addition and warming on soil carbon, nutrient pools and microbial communities in a subarctic heath ecosystem
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Effects of litter addition and warming on soil carbon, nutrient pools and microbial communities in a subarctic heath ecosystem. / Rinnan, Riikka; Michelsen, Anders; Jonasson, Sven Evert.
In: Agriculture, Ecosystems & Environment. Applied Soil Ecology, Vol. 39, No. 1, 2008, p. 271-281.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Effects of litter addition and warming on soil carbon, nutrient pools and microbial communities in a subarctic heath ecosystem
AU - Rinnan, Riikka
AU - Michelsen, Anders
AU - Jonasson, Sven Evert
N1 - Keywords: Arctic; Climate change; Microbial biomass; Phospholipid fatty acids; Nutrient pools; Near-infrared spectroscopy
PY - 2008
Y1 - 2008
N2 - Climatic warming leads to the expansion of deciduous shrubs and trees in the Arctic. This leads to higher leaf litter inputs, which together with warming may alter the rate of carbon and nutrient cycling in the arctic ecosystems. We assessed effects of factorial warming and additional litter on the soil ecosystem of a subarctic heath in a 7-year-long field experiment. Fine root biomass, dissolved organic carbon (DOC) and total C concentration increased in response to warming, which probably was a result of the increased vegetation cover. Litter addition increased the concentration of inorganic P in the uppermost 5 cm soil, while decreasing the pool of total P per unit area of the organic profile and having no significant effects on N concentrations or pools. Microbial biomass C and N were unaffected by the treatments, while the microbial biomass P increased significantly with litter addition. Soil ergosterol concentration was also slightly increased by the added litter in the uppermost soil, although not statistically significantly. According to a principal component analysis of the phospholipid fatty acid profiles, litter addition differed from the other treatments by increasing the relative proportion of biomarkers for Gram-positive bacteria. The combined warming plus litter addition treatment decreased the soil water content in the uppermost 5 cm soil, which was a likely reason for many interactions between the effects of warming and litter addition. The soil organic matter quality of the combined treatment was also clearly different from the control based on a near-infrared reflectance (NIR) spectroscopic analysis, implying that the treatment altered the composition of soil organic matter. However, it appears that the biological processes and the microbial community composition responded more to the soil and litter moisture conditions than to the change in the quality of the organic matter.
AB - Climatic warming leads to the expansion of deciduous shrubs and trees in the Arctic. This leads to higher leaf litter inputs, which together with warming may alter the rate of carbon and nutrient cycling in the arctic ecosystems. We assessed effects of factorial warming and additional litter on the soil ecosystem of a subarctic heath in a 7-year-long field experiment. Fine root biomass, dissolved organic carbon (DOC) and total C concentration increased in response to warming, which probably was a result of the increased vegetation cover. Litter addition increased the concentration of inorganic P in the uppermost 5 cm soil, while decreasing the pool of total P per unit area of the organic profile and having no significant effects on N concentrations or pools. Microbial biomass C and N were unaffected by the treatments, while the microbial biomass P increased significantly with litter addition. Soil ergosterol concentration was also slightly increased by the added litter in the uppermost soil, although not statistically significantly. According to a principal component analysis of the phospholipid fatty acid profiles, litter addition differed from the other treatments by increasing the relative proportion of biomarkers for Gram-positive bacteria. The combined warming plus litter addition treatment decreased the soil water content in the uppermost 5 cm soil, which was a likely reason for many interactions between the effects of warming and litter addition. The soil organic matter quality of the combined treatment was also clearly different from the control based on a near-infrared reflectance (NIR) spectroscopic analysis, implying that the treatment altered the composition of soil organic matter. However, it appears that the biological processes and the microbial community composition responded more to the soil and litter moisture conditions than to the change in the quality of the organic matter.
KW - Faculty of Science
KW - økologi
KW - planter
KW - jord
KW - climate change
KW - arktis
KW - ecology
KW - plants
KW - soil
KW - climate change
KW - arctic
U2 - 10.1016/j.apsoil.2007.12.014
DO - 10.1016/j.apsoil.2007.12.014
M3 - Journal article
VL - 39
SP - 271
EP - 281
JO - Applied Soil Ecology
JF - Applied Soil Ecology
SN - 0929-1393
IS - 1
ER -
ID: 8571174