The cycling of readily available phosphorus in response to elevated phosphate in acidic temperate deciduous forests

Shaw, Alanna N.; DeForest, Jared L.

doi:10.1016/j.apsoil.2012.09.008

Cited by 28 publications

(25 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Overall, the sum of the two biotic pools – seasonal average MBP and estimated annual P requirements of the canopy trees – exceeded the size of the available P pool, indicating that the microbial biomass drove the observed P dynamics. Seasonal averages provide a conservative estimate of available pool sizes because these pools are expected to have a high turnover rate of days to weeks (Shaw & DeForest, ). The trend was stronger for AM plots and whether these are more P‐limited than the ECM plots due to the lower ability of their microbial biomass to utilize organic P sources, or whether AM plots have a higher turnover rate of MBP, warrant further study.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees

et al. 2015

View full text Add to dashboard Cite

SummaryAlthough much is known about how trees and their associated microbes influence nitrogen cycling in temperate forest soils, less is known about biotic controls over phosphorus (P) cycling. Given that mycorrhizal fungi are instrumental for P acquisition and that the two dominant associations -arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungi -possess different strategies for acquiring P, we hypothesized that P cycling would differ in stands dominated by trees associated with AM vs ECM fungi.We quantified soil solution P, microbial biomass P, and sequentially extracted inorganic and organic P pools from May to November in plots dominated by trees forming either AM or ECM associations in south-central Indiana, USA.Overall, fungal communities in AM and ECM plots were functionally different and soils exhibited fundamental differences in P cycling. Organic forms of P were more available in ECM plots than in AM plots. Yet inorganic P decreased and organic P accumulated over the growing season in both ECM and AM plots, resulting in increasingly P-limited microbial biomass.Collectively, our results suggest that P cycling in hardwood forests is strongly influenced by biotic processes in soil and that these are driven by plant-associated fungal communities.

show abstract

Section: Discussionmentioning

confidence: 99%

Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Prepared plates were incubated in the dark at 20 C for up to 24 h following substrate addition. Fluorescence was measured without addition of NaOH (German et al, 2011;Shaw and DeForest, 2013) using a FLUOstar Omega microplate reader (BMG Labtech) with l365 nm excitation and l460 nm emission filters. Following correction of the assay wells' fluorescence measurements for negative controls, blanks and quench standard wells, enzyme activity was expressed as nanomoles of substrate released per hour per gram of dry soil (nmol h À1 g À1 ).…”

Section: Enzyme Analysismentioning

confidence: 99%

Linkages between extracellular enzyme activities and the carbon and nitrogen content of grassland soils

Cenini

Fornara

McMullan

et al. 2016

Soil Biology and Biochemistry

183

View full text Add to dashboard Cite

Important biochemical reactions in soils are catalyzed by extracellular enzymes, which are synthesized by microbes and plant roots. Although enzyme activities can significantly affect the decomposition of soil organic matter and thus influence the storage and cycling of carbon (C) and nitrogen (N), it is not clear how enzyme activities relate to changes in the C and N content of different grassland soils. Here we address whether the activity of C-acquiring (b-1,4-glucosidase, BG) and N-acquiring (L-leucine aminopeptidase (LAP) and b-1,4-N-acetyl-glucosaminidase (NAG)) enzymes is linked to changes in the C and N content of a variety of human-managed grassland soils. We selected soils which have a well-documented management history going back at least 19 years in relation to changes in land use (grazing, mowing, ploughing), nutrient fertilization and lime (CaCO 3) applications. Overall we found a positive relationship between BG activity and soil C content as well as between LAP þ NAG activity and soil N. These positive relationships occurred across grasslands with very different soil pH and management history but not in intensively managed grasslands where increases in soil bulk density (i.e. high soil compaction) negatively affected enzyme activity. We also found evidence that chronic nutrient fertilization contributed to increases in soil C content and this was associated with a significant increase in BG activity when compared to unfertilized soils. Our study suggests that while the activities of C-and N-acquiring soil enzymes are positively related to soil C and N content, these activities respond significantly to changes in management (i.e. soil compaction and nutrient fertilization). In particular, the link between BG activity and the C content of long-term fertilized soils deserves further investigation if we wish to improve our understanding of the C sequestration potential of human-managed grassland soils.

show abstract

“…Different letters in each column represent significant differences between different mineral fertilizer and manure additions (P b 0.05; Duncan's test). fertilizer applications (Shaw and DeForest, 2013;Wang et al, 2012). Giacometti et al (2014) found that AP activity and soil pH were negatively related and suggested that either the rate of synthesis and release by soil microorganisms or its stability was related to soil pH.…”

Section: Effects Of Fertilizer Practices On Soil Absolute Enzyme Actimentioning

confidence: 99%

Responses of absolute and specific soil enzyme activities to long term additions of organic and mineral fertilizer

Zhang

Dong

Dai

et al. 2015

Science of The Total Environment

161

View full text Add to dashboard Cite

• Acid phosphatase activity was negatively correlated with soil pH and P content.• βG, NAG, and LAP activities were positively correlated with SOC and Total N contents.• The four enzyme activities were significantly higher under manure than NPK fertilizer.• Enzyme activities were positively correlated with actinomycete and G + bacterium.• We recommend reducing P fertilizer application rates to subtropical paddy soils. G R A P H I C A L A B S T R A C Ta b s t r a c t a r t i c l e i n f o Long-term phosphorus (P) and nitrogen (N) applications may seriously affect soil microbial activity. A long-term field fertilizer application trial was established on reddish paddy soils in the subtropical region of southern China in 1998. We assessed the effects of swine manure and seven different rates or ratios of NPK fertilizer treatments on (1) the absolute and specific enzyme activities per unit of soil organic carbon (SOC) or microbial biomass carbon (MBC) involved in C, N, and P transformations and (2) their relationships with soil environmental factors and soil microbial community structures. The results showed that manure applications led to increases in the absolute and specific activities of soil β-1,4-glucosidase(βG), β-1,4-N-acetylglucosaminidase (NAG), and leucine aminopeptidase (LAP). The absolute and specific acid phosphatase (AP) activities decreased as mineral P fertilizer application rates and ratios increased. Redundancy analysis (RDA) showed that there were negative correlations between absolute and specific AP activities, pH, and total P contents, while there were positive correlations between soil absolute and specific βG, NAG, and LAP enzyme activities, and SOC and total N contents. RDA showed that the contents of actinomycete and Gram-positive bacterium PLFA biomarkers are more closely related to the absolute and specific enzyme activities than the other PLFA biomarkers (P b 0.01). Our results suggest that both the absolute and specific enzyme activities could be used as sensitive soil quality indicators that provide useful linkages with the microbial community structures and environmental factors. To maintain microbial activity and to minimize environmental impacts, P should be applied as a combination of inorganic and organic forms, and total P fertilizer application rates to subtropical paddy soils should not exceed 44 kg P ha −1 year −1 .

show abstract

The cycling of readily available phosphorus in response to elevated phosphate in acidic temperate deciduous forests

Cited by 28 publications

References 34 publications

Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees

Phosphorus cycling in deciduous forest soil differs between stands dominated by ecto‐ and arbuscular mycorrhizal trees

Linkages between extracellular enzyme activities and the carbon and nitrogen content of grassland soils

Responses of absolute and specific soil enzyme activities to long term additions of organic and mineral fertilizer

Contact Info

Product

Resources

About