Plant nitrate use in deciduous woodland: the relationship between leaf N, 15N natural abundance of forbs and soil N mineralisation

Falkengren‐Grerup, Ursula; Michelsen, Anders; Olsson, M O; Quarmby, C.; Sleep, Darren

doi:10.1016/j.soilbio.2004.05.009

Cited by 40 publications

(24 citation statements)

References 30 publications

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“…Reduced competition and increased light, moisture and nutrients are likely stimulants of this growth. As forbs prefer NO 3 − uptake over NH 4 + in deciduous woodland (Falkengren-Grerup et al, 2004) and alpine meadow (Miller and Bowman, 2002) systems, increased forb cover observed in this study may be related to increased net nitrification. The positive relationship between N mineralization and C. geyerii %N also suggests that herbaceous species benefit from increased N availability during bark beetle outbreak.…”

Section: Foliar N and Biomassmentioning

confidence: 51%

Nitrogen cycling following mountain pine beetle disturbance in lodgepole pine forests of Greater Yellowstone

Griffin

Turner

Simard

2011

Forest Ecology and Management

106

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Section: Foliar N and Biomassmentioning

confidence: 51%

Nitrogen cycling following mountain pine beetle disturbance in lodgepole pine forests of Greater Yellowstone

Griffin

Turner

Simard

2011

Forest Ecology and Management

106

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“…Because the model did not independently converge on a single answer, we ran multiple models that each had a different breakpoint temperature set a priori and selected the temperature that produced the lowest error sums of squares. Data from Falkengren‐Grerup et al . (2004) were removed from the dataset as the data altered the breakpoint for MAT from −0.5 to 8.5°C and they appeared to be extreme outliers in other relationships (see below).…”

Section: Methodsmentioning

confidence: 99%

Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability

et al. 2009

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SummaryRatios of nitrogen (N) isotopes in leaves could elucidate underlying patterns of N cycling across ecological gradients. To better understand global-scale patterns of N cycling, we compiled data on foliar N isotope ratios (δ 15 N), foliar N concentrations, mycorrhizal type and climate for over 11 000 plants worldwide. Arbuscular mycorrhizal, ectomycorrhizal, and ericoid mycorrhizal plants were depleted in foliar δ 15 N by 2‰, 3.2‰, 5.9‰, respectively, relative to nonmycorrhizal plants. Foliar δ 15 N increased with decreasing mean annual precipitation and with increasing mean annual temperature (MAT) across sites with MAT ≥ −0.5°C, but was invariant with MAT across sites with MAT < −0.5°C. In independent landscape-level to regionallevel studies, foliar δ 15 N increased with increasing N availability; at the global scale, foliar δ 15 N increased with increasing foliar N concentrations and decreasing foliar phosphorus (P) concentrations. Together, these results suggest that warm, dry ecosystems have the highest N availability, while plants with high N concentrations, on average, occupy sites with higher N availability than plants with low N concentrations. Global-scale comparisons of other components of the N cycle are still required for better mechanistic understanding of the determinants of variation in foliar δ 15 N and ultimately global patterns in N cycling.

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“…inorganic nitrogen, at all soil depths, as it is leached. [74] In combination, these data suggest that the two dominant plant species may access different sources of nitrogen. [75,76] Hence, the d 15 N shift between depths in enchytraeids corresponds to the shift in d 15 N in Calluna fine roots and this suggests that enchytraeids feed on Calluna fine root material in addition to grass root material, soil microbes and detritus.…”

Section: Andmentioning

confidence: 97%

Organic matter flow in the food web at a temperate heath under multifactorial climate change

Andresen

Konestabo

Maraldo

et al. 2011

Rapid Comm Mass Spectrometry

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The rising atmospheric CO(2) concentration, increasing temperature and changed patterns of precipitation currently expose terrestrial ecosystems to altered environmental conditions. This may affect belowground nutrient cycling through its intimate relationship with the belowground decomposers. Three climate change factors (elevated CO(2), increased temperature and drought) were investigated in a full factorial field experiment at a temperate heathland location. The combined effect of biotic and abiotic factors on nitrogen and carbon flows was traced in plant root → litter → microbe → detritivore/omnivore → predator food-web for one year after amendment with (15)N(13)C(2)-glycine. Isotope ratio mass spectrometry (IRMS) measurement of (15)N/(14)N and (13)C/(12)C in soil extracts and functional ecosystem compartments revealed that the recovery of (15)N sometimes decreased through the chain of consumption, with the largest amount of bioactive (15)N label pool accumulated in the microbial biomass. The elevated CO(2) concentration at the site for 2 years increased the biomass, the (15)N enrichment and the (15)N recovery in detritivores. This suggests that detritivore consumption was controlled by both the availability of the microbial biomass, a likely major food source, and the climatic factors. Furthermore, the natural abundance δ(13)C of enchytraeids was significantly altered in CO(2)-fumigated plots, showing that even small changes in δ(13)C-CO(2) can be used to detect transfer of carbon from primary producers to detritivores. We conclude that, in the short term, the climate change treatments affected soil organism activity, possibly with labile carbohydrate production controlling the microbial and detritivore biomass, with potential consequences for the decomposition of detritus and nutrient cycling. Hence, there appears to be a strong coupling of responses in carbon and nitrogen cycling at this temperate heath.

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Plant nitrate use in deciduous woodland: the relationship between leaf N, 15N natural abundance of forbs and soil N mineralisation

Cited by 40 publications

References 30 publications

Nitrogen cycling following mountain pine beetle disturbance in lodgepole pine forests of Greater Yellowstone

Nitrogen cycling following mountain pine beetle disturbance in lodgepole pine forests of Greater Yellowstone

Global patterns of foliar nitrogen isotopes and their relationships with climate, mycorrhizal fungi, foliar nutrient concentrations, and nitrogen availability

Organic matter flow in the food web at a temperate heath under multifactorial climate change

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