Elevated atmospheric CO2 changes phosphorus fractions in soils under a short rotation poplar plantation (EuroFACE)

Khan, Faisal N.; Lukáč, Martin; Turner, Gordon; Godbold, Douglas L.

doi:10.1016/j.soilbio.2008.02.008

Cited by 34 publications

(25 citation statements)

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“…Similarly, soil C:N, C:P and N:P ratios were not affected by CO 2 treatment indicating that the mineral soil was not a source of increased nutrient uptake under elevated CO 2 . However, applying a more elaborate P fractionation method to samples of the fifth experimental year, Khan et al (2008) found a positive CO 2 effect on NaOH and HCl-extractable P and suggested that increased fine root and mycorrhizal biomass under elevated CO 2 may have increased mineral weathering and replenishment of available P. This extra replenishment may have compensated increased P uptake resulting in no CO 2 effect on soil organic and available P as was observed in this study. At the end of the BangorFACE experiment in 2008, aboveground woody biomass was larger in elevated CO 2 than in ambient plots with respectively 6450 and 5497 g m -2 (Hoosbeek et al 2011).…”

Section: Discussionsupporting

confidence: 40%

“…As a result of increased productivity in elevated CO 2 , more labile C will enter litter and soil layers (Hoosbeek et al 2004) which may speed up the turnover of C and nutrients due to increased root turnover (Lukac et al 2003;Smith et al 2013), mycorrhizal hyphal turnover ) and microbial activity (Johnson et al 2004;Lagomarsino et al 2008). An implication of this increased turnover may be the increase of P availability due to biogenically driven mineral weathering (Khan et al 2008) and/or increased mineralization of organic P which is controlled by phosphatase enzyme activity (Burns et al 2013;Sinsabaugh and Follstad Shah 2012). In a meta-analysis, Marklein and Houlton (2012) evaluated the effects of N and P fertilization on phosphatase activity and showed that increased N availability enhanced phosphatase activity.…”

Section: Discussionmentioning

confidence: 99%

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Elevated CO2 increased phosphorous loss from decomposing litter and soil organic matter at two FACE experiments with trees

Hoosbeek

2015

Biogeochemistry

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Sustained increased productivity of trees growing in elevated CO 2 depends in part on their stoichiometric flexibility, i.e., increasing their nutrient use efficiency, or on increased nutrient uptake from the soil. Phosphorus (P) may be a nutrient as limiting as nitrogen (N) in terrestrial ecosystems and may play a key-process in global terrestrial C storage. For this study archived litter and soil samples of two free air CO 2 enrichment (FACE) experiments were analyzed for C, N and P. Populus euramericana, nigra and alba and Betula pendula, Alnus glutinosa and Fagus sylvatica were grown in ambient and elevated CO 2 at respectively the Euro-and BangorFACE experiments. At EuroFACE, aboveground litter accumulated in L, F and H layers, while at BangorFACE almost all aboveground litter was incorporated into the mineral soil due to bioturbation. At EuroFACE, more P was lost from the F and H litter layers due to trees growing in elevated CO 2 , while at BangorFACE more P was lost from the mineral soil. Results of this study imply that trees growing in elevated CO 2 were P limited at both experiments. Therefore, with increasing atmospheric CO 2 , P may play a more pronounced role than previous thought in regulating secondary forest growth. Moreover, increased atmospheric CO 2 and ample N may allow a larger pool of P to become available for uptake due to, for instance, increased phosphatase activity resulting in increased organic matter turnover and biogenic weathering. Therefore, it may be postulated that under non-N-limited conditions, e.g., during regrowth, under high N deposition or in systems with high N 2 -fixation, increased P availability and uptake may allow P-limited forests to sustain increased growth under increasing atmospheric CO 2 .

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Section: Discussionsupporting

confidence: 40%

Section: Discussionmentioning

confidence: 99%

Elevated CO2 increased phosphorous loss from decomposing litter and soil organic matter at two FACE experiments with trees

Hoosbeek

2015

Biogeochemistry

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“…It is difficult to assess how realistic such a redistribution of adsorbed P to labile forms is. Evidence from short-term CO 2 enrichment studies suggest that a redistribution of P from unavailable to available forms does occur under elevated CO 2 (Johnson et al, 2004;Khan et al, 2008). However, it is unclear which processes are responsible for the observed redistribution and how these results from short-term experiments translate to natural ecosystems affected by a steady increase in CO 2 over centuries.…”

Section: Land C Sink Until 2100mentioning

confidence: 99%

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

et al. 2012

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Abstract.Terrestrial carbon (C) cycle models applied for climate projections simulate a strong increase in net primary productivity (NPP) due to elevated atmospheric CO 2 concentration during the 21st century. These models usually neglect the limited availability of nitrogen (N) and phosphorus (P), nutrients that commonly limit plant growth and soil carbon turnover. To investigate how the projected C sequestration is altered when stoichiometric constraints on C cycling are considered, we incorporated a P cycle into the land surface model JSBACH (Jena Scheme for Biosphere-Atmosphere Coupling in Hamburg), which already includes representations of coupled C and N cycles.The model reveals a distinct geographic pattern of P and N limitation. Under the SRES (Special Report on Emissions Scenarios) A1B scenario, the accumulated land C uptake between 1860 and 2100 is 13 % (particularly at high latitudes) and 16 % (particularly at low latitudes) lower in simulations with N and P cycling, respectively, than in simulations without nutrient cycles. The combined effect of both nutrients reduces land C uptake by 25 % compared to simulations without N or P cycling. Nutrient limitation in general may be biased by the model simplicity, but the ranking of limitations is robust against the parameterization and the inflexibility of stoichiometry. After 2100, increased temperature and high CO 2 concentration cause a shift from N to P limitation at high latitudes, while nutrient limitation in the tropics declines. The increase in P limitation at high-latitudes is induced by a strong increase in NPP and the low P sorption capacity of soils, while a decline in tropical NPP due to high autotrophic respiration rates alleviates N and P limitations. The quantification of P limitation remains challenging. The poorly constrained processes of soil P sorption and biochemical mineralization are identified as the main uncertainties in the strength of P limitation. Even so, our findings indicate that global land C uptake in the 21st century is likely overestimated in models that neglect P and N limitations. In the long term, insufficient P availability might become an important constraint on C cycling at high latitudes. Accordingly, we argue that the P cycle must be included in global models used for C cycle projections.

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“…In addition, N addition decreases soil pH, which then mobilizes soil aluminum and iron, therefore reducing available P through increased P sorption and decreased mineralization of organic matter (Carreira et al 2000). The content and forms of soil organic P may also be influenced by N addition through changes in organic matter input (Khan et al 2008). Taken together, if continued N addition changes the soil P cycle, then understanding how the soil P status changes in response to N addition will be important for predicting forest ecosystem function.…”

Section: Introductionmentioning

confidence: 99%

Changes in soil phosphorus fractions after 9 years of continuous nitrogen addition in a Larix gmelinii plantation

Yang

Zhu

et al. 2014

Annals of Forest Science

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Abstract• The key message N addition decreased soil inorganic P availability, microbial biomass P, and acid phosphatase activity in the larch plantation. Soil inorganic P availability decreased after N addition due to the changes in both microbial properties and plant uptake.• Context Soil phosphorus (P) availability is considered an important factor in influencing the biomass production of plants. Sustained inputs of nitrogen (N) through atmospheric deposition or N fertilizers, particularly in temperate forests, may change the composition and availability of P and thus affect long-term forest productivity.• Aims The objective of this study was to assess soil P availability, P fractions, and microbial properties including microbial biomass P and acid phosphatase activity after 9 consecutive years of N addition in a larch (Larix gmelinii) plantation, northeastern China.• Methods From 2003 to 2011, NH 4 NO 3 was added to replicate plots (three 20 m×30 m plots) in the larch plantation each year at a rate of 100 kg N ha. Soil samples from 0-10-cm and 10-20-cm depths were collected in N addition plots and control (no N addition) plots.• Results N addition significantly decreased soil NaHCO 3 -Pi (Pi is inorganic P), microbial biomass P, and acid phosphatase activity but increased the NaOH-Pi concentration. N addition appeared to induce a decrease in soil inorganic P availability by changing pH and P uptake by trees. In addition, N addition significantly decreased the NaOH-Po (Po is organic P) concentration, possibly because of increased P mineralization. However, the total P and other P fractions were unaffected by N fertilization.• Conclusion Our results suggested that N addition enhanced P uptake by trees, whereas it reduced soil inorganic P availability as well as microbial biomass and activity related to soil P cycling in the larch plantation.Keywords Larch plantation . Microbial biomass P . Phosphorus availability . Phosphatase activity IntroductionNitrogen (N) is generally believed to be the one nutrient limiting primary productivity in a wide variety of terrestrial ecosystems (LeBauer and Treseder 2008), particularly in Handling Editor: Andreas BOLTE Contribution of the co-authors Kai Yang-designed and ran the experiment, analyzed the data, and wrote the manuscript. Jiaojun Zhu-supervised the experiment design and data analysis and wrote the manuscript. Jiacun Gu-sample analysis and gave the help in running the experiment. Lizhong Yu-sample analysis and gave the help in running the experiment. Zhengquan Wang-designed the experiment and gave the suggestions to the composition of manuscript.Electronic supplementary material The online version of this article

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Elevated atmospheric CO2 changes phosphorus fractions in soils under a short rotation poplar plantation (EuroFACE)

Cited by 34 publications

References 50 publications

Elevated CO2 increased phosphorous loss from decomposing litter and soil organic matter at two FACE experiments with trees

Elevated CO2 increased phosphorous loss from decomposing litter and soil organic matter at two FACE experiments with trees

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

Changes in soil phosphorus fractions after 9 years of continuous nitrogen addition in a Larix gmelinii plantation

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