Abstract:Modified Hedley fraction method was used to study the forms and profile distribution in the tidal river network region subjected to rapid deposition and hydrologic disturbance in the Yellow River Delta (YRD) estuary, eastern China. The results showed that the total P (Pt) ranged from 612.1 to 657.8 mg kg−1. Dilute HCl extractable inorganic P (Pi) was the predominant form in all profiles, both as absolute values and as a percentage of total extracted Pi. The NaOH extractable organic P (Po) was the predominant f… Show more
“…The total organic carbon (TOC), Ca, Al, and Fe ranged at 1.5–16.7, 32.7–69.0, 53.1–81.0, and 16.7–44.4 mg g −1 , respectively (Table ). The soils in this study were classified according to their organic matter (C org < 20%) and taken as the mineral soils (Yu et al, ). As the organic matter is easily dissolved in water, it was lost during the long transportation process from the Loess Plateau to the estuarine coastal wetland via the YR.…”
Section: Resultsmentioning
confidence: 99%
“…has been identified as the climax vegetation species in the delta wetlands. The main soil types are typical saline alluvial soils (Fluvisols, Food and Agriculture Organization; Yu et al, ).…”
Section: Methodsmentioning
confidence: 99%
“…For better understanding of different geochemical or ecological significance of P forms, Tiessen and Moir promoted a modified Hedley fractionation scheme, which extracted P i and P o of increasing chemical stability (Fabre, Gauquelin, Vilasante, Ortega, & Puig, ). This modified procedure and the measurements of soil parameters and the content of have been specifically described by Yu et al (). A laser particle analyzer (Malvern Mastersizer 2000F) was used for the measurement of grain size.…”
Section: Methodsmentioning
confidence: 99%
“…Phosphorus (P) attached to sediment is initially eroded from upland regions and transported to waterbodies in the P cycle (Bruland & DeMent, ). The P sediment and river water may travel through wetlands in most of wetlands and muddy coasts before reaching the ocean to complete the cycle (Yu et al, ). P entering these coastal wetlands, which is partitioned into organic or inorganic forms, will be partitioned into labile and refractory components to understand the soil P availability in the study of its biogeochemistry (Levy & Schlesinger, ).…”
Section: Introductionmentioning
confidence: 99%
“…As one important nutrient element, P forms have a close linkage with soil quality, further directly influencing land degradation, especially in the coastal zone (Gao et al, ; Tian, Zhai, Zhao, & Mu, ). Previous studies have used sequential fractionation to partition the soil P into inorganic, organic, and microbial forms (Levy & Schlesinger, ), which subdivided into the plant‐available forms (including Resin‐P i , NaHCO 3 ‐P i , and NaHCO 3 ‐P o ) and the refractory forms (including NaOH‐P i , NaOH‐P o , Dil.HCl‐P i , Conc.HCl‐P i , Conc.HCl‐P o , and Residual‐P; Yu et al, ). Across different mineral weathering and soil development gradients, the organically bound fractions and the geochemically bound fractions in soil P, which were used to describe the contribution of biological process, were easily separated by the Hedley, Stewart, and Chauhan () fractionation (Cross & Schlesinger, ; G. Wang et al, ).…”
To study the forms and vertical distributions of soil phosphorus (P) in a newly formed coastal wetland in the Yellow River Delta estuary, China, two transects from the Yellow River bank to the bare beach that encompassed a variety of vegetation covers were selected for soil sampling and field monitoring. A modified sequential fractionation method was used to partition the soil P, and the related properties were measured. The soils in this newly formed estuarine coastal wetland, only covered by salt-tolerant plant communities, are strongly alkaline (pH 8.4-9.2) with high soil salinity (mean, 6.23‰). The content of total P (Pt) ranged from 548.3 to 728.5 mg kg −1 in these soils. Dil.HCl-P i (extracted with 1 M HCl) was the highest P fraction (mean, 58.1-72.8%), whereas NaHCO 3 -P i was the lowest fraction (mean, 0.4-1.7%) of all the P forms. Vertical distributions showed a surface accumulation of Resin-P. Resin-P, NaHCO 3 -P i , NaOH-P i , and Conc.HCl-P i (extracted with 11.3 M HCl) were positively or negatively correlated with some properties.Attributed to the spatial deposition and hydrology, Dil.HCl-P i presented a poor correlation with Ca. The results also showed some clear differences in the P forms and P availability among vegetation covers. The vegetation cover could modify the soil quality, and Suaeda heteroptera, as the pioneer plant community species, significantly enhanced the freely exchangeable P i and increased P availability, providing important ideas for salt-soil sustainable use.
“…The total organic carbon (TOC), Ca, Al, and Fe ranged at 1.5–16.7, 32.7–69.0, 53.1–81.0, and 16.7–44.4 mg g −1 , respectively (Table ). The soils in this study were classified according to their organic matter (C org < 20%) and taken as the mineral soils (Yu et al, ). As the organic matter is easily dissolved in water, it was lost during the long transportation process from the Loess Plateau to the estuarine coastal wetland via the YR.…”
Section: Resultsmentioning
confidence: 99%
“…has been identified as the climax vegetation species in the delta wetlands. The main soil types are typical saline alluvial soils (Fluvisols, Food and Agriculture Organization; Yu et al, ).…”
Section: Methodsmentioning
confidence: 99%
“…For better understanding of different geochemical or ecological significance of P forms, Tiessen and Moir promoted a modified Hedley fractionation scheme, which extracted P i and P o of increasing chemical stability (Fabre, Gauquelin, Vilasante, Ortega, & Puig, ). This modified procedure and the measurements of soil parameters and the content of have been specifically described by Yu et al (). A laser particle analyzer (Malvern Mastersizer 2000F) was used for the measurement of grain size.…”
Section: Methodsmentioning
confidence: 99%
“…Phosphorus (P) attached to sediment is initially eroded from upland regions and transported to waterbodies in the P cycle (Bruland & DeMent, ). The P sediment and river water may travel through wetlands in most of wetlands and muddy coasts before reaching the ocean to complete the cycle (Yu et al, ). P entering these coastal wetlands, which is partitioned into organic or inorganic forms, will be partitioned into labile and refractory components to understand the soil P availability in the study of its biogeochemistry (Levy & Schlesinger, ).…”
Section: Introductionmentioning
confidence: 99%
“…As one important nutrient element, P forms have a close linkage with soil quality, further directly influencing land degradation, especially in the coastal zone (Gao et al, ; Tian, Zhai, Zhao, & Mu, ). Previous studies have used sequential fractionation to partition the soil P into inorganic, organic, and microbial forms (Levy & Schlesinger, ), which subdivided into the plant‐available forms (including Resin‐P i , NaHCO 3 ‐P i , and NaHCO 3 ‐P o ) and the refractory forms (including NaOH‐P i , NaOH‐P o , Dil.HCl‐P i , Conc.HCl‐P i , Conc.HCl‐P o , and Residual‐P; Yu et al, ). Across different mineral weathering and soil development gradients, the organically bound fractions and the geochemically bound fractions in soil P, which were used to describe the contribution of biological process, were easily separated by the Hedley, Stewart, and Chauhan () fractionation (Cross & Schlesinger, ; G. Wang et al, ).…”
To study the forms and vertical distributions of soil phosphorus (P) in a newly formed coastal wetland in the Yellow River Delta estuary, China, two transects from the Yellow River bank to the bare beach that encompassed a variety of vegetation covers were selected for soil sampling and field monitoring. A modified sequential fractionation method was used to partition the soil P, and the related properties were measured. The soils in this newly formed estuarine coastal wetland, only covered by salt-tolerant plant communities, are strongly alkaline (pH 8.4-9.2) with high soil salinity (mean, 6.23‰). The content of total P (Pt) ranged from 548.3 to 728.5 mg kg −1 in these soils. Dil.HCl-P i (extracted with 1 M HCl) was the highest P fraction (mean, 58.1-72.8%), whereas NaHCO 3 -P i was the lowest fraction (mean, 0.4-1.7%) of all the P forms. Vertical distributions showed a surface accumulation of Resin-P. Resin-P, NaHCO 3 -P i , NaOH-P i , and Conc.HCl-P i (extracted with 11.3 M HCl) were positively or negatively correlated with some properties.Attributed to the spatial deposition and hydrology, Dil.HCl-P i presented a poor correlation with Ca. The results also showed some clear differences in the P forms and P availability among vegetation covers. The vegetation cover could modify the soil quality, and Suaeda heteroptera, as the pioneer plant community species, significantly enhanced the freely exchangeable P i and increased P availability, providing important ideas for salt-soil sustainable use.
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