Identification of Phosphorus Sources in a Watershed Using a Phosphate Oxygen Isoscape Approach

Ishida, Takuya; Uehara, Yoshitoshi; Iwata, Tomoya; Cid-Andres, Abigail P.; Asano, Satoshi; Ikeya, Tomohiko; Osaka, Ken’ichi; Ide, Jun’ichiro; Privaldos, Osbert Leo; Jesus, Irisse Bianca Baldovino De; Peralta, Elfritzson M.; Triño, Ellis Mika C.; Ko, Chia Ying; Paytan, Adina; Tayasu, Ichiro; Okuda, Noboru

doi:10.1021/acs.est.8b05837

Cited by 39 publications

(37 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Oxygen isotopes in phosphate have been extensively used to study biological P cycling in soils (e.g., Helfenstein et al., 2018; Joshi et al., 2016; Tamburini et al., 2012) and for source attribution of P in water bodies (Elsbury et al., 2009; Ishida et al., 2019; Paytan et al., 2017; Pistocchi et al., 2017; Tonderski et al., 2017). The oxygen isotope values in the soil profiles along our transect generally fall into the range of isotope values observed in other studies in temperate climates (Amelung et al., 2015; Bauke et al., 2018; K. Roberts et al., 2015).…”

Section: Discussionmentioning

confidence: 99%

“…Rather it is more likely that the P released into the stream carries the isotopic equilibrium value that occurred in VBS soils. So far, studies that use oxygen isotope data to identify P sources to surface waters (Elsbury et al., 2009; Ishida et al., 2019; Paytan et al., 2017; Pistocchi et al., 2017; Tonderski et al., 2017) have done so by only comparing the original source values of soil and fertilizer with those observed for phosphate in water but hardly considered the biological cycling of P in VBS soils or in proximity of the river banks. We suggest that a quantitative assessment of P source contributions can only be achieved if biological transformations along the transport path are considered, including P cycling in VBS soils.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have compared δ 18 Ο P values of sequentially extracted soil P fractions to differentiate abiotic and biotic processes in natural systems such as those along climatic gradients (Angert et al., 2011; Helfenstein et al., 2018), along soil chronosequences (K. Roberts et al., 2015; Tamburini et al., 2012) or within soil profiles at individual sites (Amelung et al., 2015; Bauke et al., 2018; Joshi et al., 2016). Further, δ 18 Ο P values have been used to identify sources of P input to freshwater bodies by analyzing δ 18 Ο P in water and in potential sources such as fertilizer, waste water, and upstream soils within the respective catchment (Elsbury et al., 2009; Ishida et al., 2019; Paytan et al., 2017; Pistocchi et al., 2017; Tonderski et al., 2017). However, no study has considered how δ 18 Ο P values are affected by the biogeochemical cycling of P in VBS soils, a crucial ecosystem control point on the interface of the terrestrial and aquatic P cycles.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phosphate oxygen isotope ratios in vegetated riparian buffer strip soils

Bauke

Wang

Saia

et al. 2022

Vadose Zone Journal

View full text Add to dashboard Cite

The oxygen isotopic composition of phosphate (δ 18 O P ) in soils and surface water bodies has been used to trace terrestrial P inputs into aquatic ecosystems. However, enhanced biological activity in vegetated riparian buffer strips (VBSs) may lead to an alteration of δ 18 O P values. The objective of this study was to assess whether enhanced biological cycling of P in VBS soils can be identified using δ 18 O P values. For this purpose, we sampled temperate grassland soils at various depths along a VBS to grassland transect. Here, we combined sequential P soil extracts with an analysis of δ 18 O P values. Soil P pool concentrations tended to decrease significantly along the transect from the VBS to the grassland soils; the strength of this relationship varied with P extract, sample depth, and inorganic or organic bonding form. For the δ 18 O P values of the 1 M HCl-extractable P we observed a significant negative trend along the VBS to grassland transect, indicating a tendency for accelerated rates of biological cycling of P within the VBS soil profile compared with the upslope soils. We conclude that oxygen isotope-based assessments of P source contributions to freshwater bodies should consider the enhanced biological turnover of P in VBS soils. INTRODUCTIONSurface waters worldwide receive excessive inputs of nutrients such as N and P from agricultural production and other human activities adjacent to rivers, lakes, and coastal estuaries. These nutrient inputs trigger eutrophication of waterAbbreviations: AIC, Akaike information criteria; IRMS, isotope ratio mass spectrometer; P i , inorganic phosphorus; P o , organic phosphorus; VBS, vegetated riparian buffer strip; δ 18 O P , standardized oxygen isotope ratio in phosphate.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Phosphate oxygen isotope ratios in vegetated riparian buffer strip soils

Bauke

Wang

Saia

et al. 2022

Vadose Zone Journal

View full text Add to dashboard Cite

show abstract

“…low during winter but high in spring and summer) (Malard et al ., 2000). A similar high‐scope, spatial synoptic sampling campaign was used to identify non‐point sources of pollutants throughout an entire watershed (Ishida et al ., 2019).…”

Section: Applications In Research and Managementmentioning

confidence: 99%

Riverscape approaches in practice: perspectives and applications

et al. 2021

View full text Add to dashboard Cite

Landscape perspectives in riverine ecology have been undertaken increasingly in the last 30 years, leading aquatic ecologists to develop a diverse set of approaches for conceptualizing, mapping and understanding ‘riverscapes’. Spatiotemporally explicit perspectives of rivers and their biota nested within the socio‐ecological landscape now provide guiding principles and approaches in inland fisheries and watershed management. During the last two decades, scientific literature on riverscapes has increased rapidly, indicating that the term and associated approaches are serving an important purpose in freshwater science and management. We trace the origins and theoretical foundations of riverscape perspectives and approaches and examine trends in the published literature to assess the state of the science and demonstrate how they are being applied to address recent challenges in the management of riverine ecosystems. We focus on approaches for studying and visualizing rivers and streams with remote sensing, modelling and sampling designs that enable pattern detection as seen from above (e.g. river channel, floodplain, and riparian areas) but also into the water itself (e.g. aquatic organisms and the aqueous environment). Key concepts from landscape ecology that are central to riverscape approaches are heterogeneity, scale (resolution, extent and scope) and connectivity (structural and functional), which underpin spatial and temporal aspects of study design, data collection and analysis. Mapping of physical and biological characteristics of rivers and floodplains with high‐resolution, spatially intensive techniques improves understanding of the causes and ecological consequences of spatial patterns at multiple scales. This information is crucial for managing river ecosystems, especially for the successful implementation of conservation, restoration and monitoring programs. Recent advances in remote sensing, field‐sampling approaches and geospatial technology are making it increasingly feasible to collect high‐resolution data over larger scales in space and time. We highlight challenges and opportunities and discuss future avenues of research with emerging tools that can potentially help to overcome obstacles to collecting, analysing and displaying these data. This synthesis is intended to help researchers and resource managers understand and apply these concepts and approaches to address real‐world problems in freshwater management.

show abstract

“…These human‐induced alterations may promote severe eutrophication and can negatively affect biodiversity and food security 1–3 . To address these issues, it is necessary to understand the processes influencing P transformations between inorganic and organic forms 4 in the environment and to identify the source of P reaching water bodies 5,6 …”

Section: Introductionmentioning

confidence: 99%

A new method for phosphate purification for oxygen isotope ratio analysis in freshwater and soil extracts using solid‐phase extraction with zirconium‐loaded resin

Ishida

Kamiya

Uehara

et al. 2022

Rapid Comm Mass Spectrometry

Self Cite

View full text Add to dashboard Cite

Rationale Phosphate (PO4) oxygen isotope (δ18OPO4) analysis is increasingly applied to elucidate phosphorus cycling. Due to its usefulness, analytical methods continue to be developed and improved to increase processing efficiency and applicability to various sample types. A new pretreatment procedure to obtain clean Ag3PO4 using solid‐phase extraction (SPE) with zirconium‐loaded resin (ZrME), which can selectively adsorb PO4, is presented and evaluated here. Methods Our method comprises (1) PO4 concentration, (2) PO4 separation by SPE, (3) cation removal, (4) Cl− removal, and (5) formation of Ag3PO4. The method was tested by comparing the resulting δ18OPO4 of KH2PO4 reagent, soil extracts (NaHCO3, NaOH, and HCl), freshwater, and seawater with data obtained using a conventional pretreatment method. Results PO4 recovery of our method ranged from 79.2% to 97.8% for KH2PO4, soil extracts, and freshwater. Although the recovery rate indicated incomplete desorption of PO4 from the ZrME columns, our method produced high‐purity Ag3PO4 and accurate δ18OPO4 values (i.e., consistent with those obtained using conventional pretreatment methods). However, for seawater, the PO4 recovery was low (1.1%), probably due to the high concentrations of F− and SO42− which interfere with PO4 adsorption on the columns. Experiments indicate that the ZrME columns could be regenerated and used repeatedly at least three times. Conclusions We demonstrated the utility of ZrME for purification of PO4 from freshwater and soil extracts for δ18OPO4 analysis. Multiple samples could be processed in three days using this method, increasing sample throughput and potentially facilitating more widespread use of δ18OPO4 analysis to deepen our understanding of phosphorus cycling in natural environments.

show abstract

Identification of Phosphorus Sources in a Watershed Using a Phosphate Oxygen Isoscape Approach

Cited by 39 publications

References 49 publications

Phosphate oxygen isotope ratios in vegetated riparian buffer strip soils

Phosphate oxygen isotope ratios in vegetated riparian buffer strip soils

Riverscape approaches in practice: perspectives and applications

A new method for phosphate purification for oxygen isotope ratio analysis in freshwater and soil extracts using solid‐phase extraction with zirconium‐loaded resin

Contact Info

Product

Resources

About