Microbially Available Phosphorus in Boreal Forests: Effects of Aluminum and Iron Accumulation in the Humus Layer

Giesler, Reiner; Satoh, Fuyuki; Ilstedt, Ulrik; Nordgren, Anders

doi:10.1007/s10021-003-0223-z

Cited by 49 publications

(46 citation statements)

References 35 publications

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“…In this sense, our results suggest that active Al ox is the main factor that governs P o storage in volcanic Andisols since Al is regulating NaHCO 3 -P o and NaOH-P o accumulation (Table 6). Thus, P mobilization is affected by sorption sites of Al and Fe (Giesler et al, 2004) that are protecting P against microbial and enzymatic decomposition as showed by Stutter et al (2015). In addition, the soil with the highest Al ox and amorphous Al contents (Pemehue) presented the highest monoester P, myo-IP 6 and NaOH-P o contents.…”

Section: Discussionmentioning

confidence: 99%

Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

Redel

Cartes

Demanet

et al. 2016

J. Soil Sci. Plant Nutr.

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Volcanic ash derived soils represent between 50-60% of the total arable land area of southern of Chile, and they are the most important soils for pasture production. In these soils, high phosphorus (P) fixation and, in turn, low P availability and high aluminium (Al) soluble concentrations (at low pH) are the most limiting factors for pasture production. At the same time, the complexes between Al-or iron-(Fe) and organic matter as well as short-range order alumino-silicates (allophane) allow the retention of huge quantities of soil P. The aim of this work was to assess the status of P by both sequential extraction procedure (Hedley) and 31 P-NMR analysis as influenced by Al and Fe in volcanic grasslands Andisols (Pemehue, Gorbea, Piedras Negras and Llastuco Soil Series) from Southern Chile. We applied Hedley chemical sequential fractionation to soils in order to examine the potential differences in extractable soil inorganic P (P i ) and organic P (P o ) fractions. We also determined total P and Olsen P in these grassland Andisols. Oxalate and pyrophosphate were employed to determine the active and organic matter complexed Al and Fe, respectively. Furthermore, we quantified Al and Fe in extracts of the Hedley P fractions. We found that Al extracted in oxalate was correlated positively with labile P o concentration, specifically with both the NaHCO 3 -P o (r=0.45, P≤0.01), and the NaOH-P o (r=0.43, P≤0.01) fractions. This observation was reinforced by 31 P-NMR analysis that showed higher monoester P and myo-IP 6 content in soils with higher amounts of oxalate Al. Hedley sequential fractionation procedure confirmed the role of Al in the NaOH-P o fraction for promoting P o storage, as both fractions were correlated (r=0.33, P≤0.05). In addition, Fe plays a substantial role in recalcitrant P accumulation as we found a high correlation between residual P and oxalate Fe (r=0.55, P≤0.01).

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Section: Discussionmentioning

confidence: 99%

Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

Redel

Cartes

Demanet

et al. 2016

J. Soil Sci. Plant Nutr.

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“…4). Owing to differences in Al and Fe oxides concentrations and soil pH, stabilization of organic P and protection from microbial and enzymatic biodegradation may be less important in plot 4 than in the three other plots (Giesler et al, 2004;Celi and Barberis, 2005;Turner et al, 2005;Vincent et al, 2012). Accordingly, positive relationships between total organic P and Al and Fe oxides were found in the entire mineral soil profile (Table 2) or in a given soil layer (e.g.…”

Section: Relationships Between Soil P Fractions Microbiological Actimentioning

confidence: 97%

“…In addition to a potential effect of local climate, differences between plots 1 and 4 may also be explained by different soil properties (e.g. total P, pH, Al and Fe oxides) which may also influence decomposition processes (Fisher and Binkley, 2000;Giesler et al, 2004;Celi and Barberis, 2005;Guckland et al, 2009). Consequently, both local climatic conditions and soil properties may explain the differences observed between plots 1 and 4 in the decomposition processes.…”

Section: Possible Effects Of Vegetation and Climatementioning

confidence: 99%

Phosphorus status of soils from contrasting forested ecosystems in southwestern Siberia: effects of microbiological and physicochemical properties

et al. 2013

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The Siberian forest is a tremendous repository of terrestrial organic carbon (C), which may increase owing to climate change, potential increases in ecosystem productivity and hence C sequestration. Phosphorus (P) availability could limit the C sequestration potential, but tree roots may mine the soil deep to increase access to mineral P. Improved understanding and quantification of the processes controlling P availability in surface and deep soil layers of Siberian forest ecosystems are thus required. The objectives of the present study were to (1) evaluate P status of surface and deep soil horizons from different forest plots in southwestern Siberia and (2) assess the effects of physicochemical soil properties, microbiological activity and decomposition processes on soil P fractions and availability. Results revealed high concentrations of total P (879–1042 mg kg<sup>−1</sup> in the surface mineral soils) and plant-available phosphate ions. In addition, plant-available phosphate ions accumulated in the subsoil, suggesting that deeper root systems may mine sufficient available P for the trees and the potentially enhanced growth and C sequestration, may not be P-limited. Because the proportions of total organic P were large in the surface soil layers (47–56% of total P), we concluded that decomposition processes may play a significant role in P availability. However, microbiological activity and decomposition processes varied between the study plots and higher microbiological activity resulted in smaller organic P fractions and consequently larger available inorganic P fractions. In the studied Siberian soils, P availability was also controlled by the physicochemical soil properties, namely Al and Fe oxides and soil pH

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“…Nitrogen was added as (NH 4 ) 2 SO 4 and the amounts were 13.8 mg N to achieve excess N and 1.00 mg for DN. These amounts have previously been shown to be appropriate for quantifying N and P limitation of the microbial community in boreal forest systems by using this approach (Nordgren 1992;Giesler et al 2004). …”

Section: Microbial Respirationmentioning

confidence: 98%

“…In order to estimate the nature of nutrient limitation of the microbial community, additions of N and P were made to the four incubation vessels prepared for each sample, using the approach described by Nordgren (1992); this approach has previously been used in several studies for estimating the level of availability of soil N and P to microbial organisms (e.g., Demetz and Insam 1999;Vesterdal 1998;Ilstedt et al 2003;Giesler et al 2004;Ilstedt and Singh 2005;Gnankambary et al 2007). Glucose ?…”

Section: Microbial Respirationmentioning

confidence: 99%

Soil phosphorus and microbial response to a long-term wildfire chronosequence in northern Sweden

et al. 2009

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In the prolonged absence of major disturbances, ecosystems may enter a stage of retrogression, which is characterized by decreased ecosystem process rates both above and belowground, and often reduced availability of phosphorus (P). Disturbance through wildfire can increase soil P losses through leaching or erosion, but in the long-term absence of fire, soil P could potentially become increasingly bound in more stable forms that are less available to microbes. We studied forms of P and microbial respiration kinetics in the humus layer of a group of islands that vary considerably in wildfire frequency (40-5,300 years since last fire), and which are known to enter retrogression in the prolonged absence of fire. We found a decrease in labile P with decreasing fire frequency but no change in total P. Soil microorganisms responded more strongly to N than to P addition, and microbial biomass N:P ratios remained unchanged across the gradient. However, the concentration of labile P was the best predictor of microbial respiration responses across the islands, and this provides some evidence that declining access to P could contribute to the decline in soil microbial activity during retrogression. Our results show that even though N is arguably the main limiting nutrient during retrogression in this chronosequence, long term absence of fire also causes a decline in P availability which negatively affects microbial activity. This in turn could potentially impair microbially driven processes such as decomposition and mineralization and further contribute to the reduced availability of soil nutrients during retrogression.

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Microbially Available Phosphorus in Boreal Forests: Effects of Aluminum and Iron Accumulation in the Humus Layer

Cited by 49 publications

References 35 publications

Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

Assessment of phosphorus status influenced by Al and Fe compounds in volcanic grassland soils

Phosphorus status of soils from contrasting forested ecosystems in southwestern Siberia: effects of microbiological and physicochemical properties

Soil phosphorus and microbial response to a long-term wildfire chronosequence in northern Sweden

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