Development of an Indicator for Risk of Phosphorus Leaching

Hesketh, N.; Brookes, P. C.

doi:10.2134/jeq2000.00472425002900010013x

Cited by 232 publications

(163 citation statements)

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“…The accumulative peak of TP at 10-20 cm soil depth in summer and spring might be closely related to phosphate and dissolved organic phosphorous which were leached from surface soils (Hesketh and Brookes, 2000;Zhou et al, 2013). However, lower TP contents in deeper soils were associated with plant root uptake because soil P can be accumulated in top soils through plant litters (Jobbágy and Jackson, 2001).…”

Section: Soil P Distribution Along Soil Profiles In Three Seasonsmentioning

confidence: 99%

Spatial and seasonal distributions of soil phosphorus in a short-term flooding wetland of the Yellow River Estuary, China

Gao

Han

Bai

et al. 2016

Ecological Informatics

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Soil cores were collected at a depth of 60 cm along a sampling belt perpendicular to the Yellow River of the Yellow River Estuary and were collected in both summer and fall of 2007 and the spring of 2008 to investigate spatial and seasonal dynamics of soil phosphorus in a short-term flooding wetland. Our results showed that total phosphorus (TP) levels were lowest in spring, followed by those in summer and the maximum level was in fall along the sampling belt. Lower TP levels were observed at Site 3 in summer and fall, whereas the lowest TP levels appeared at Site 1 in spring. All available phosphorus (AP) levels were higher in fall than that in spring except for Site 4. However, in summer, AP contents showed a "decreasing before increasing" tendency along the sampling belt. TP contents in profile soils exhibited a decreasing tendency from summer to next spring, whereas AP levels increased slightly from summer to fall and decreased from fall to the next spring. TP contents increased and then decreased along soil profiles in summer and spring, whereas they showed a "decreasing before increasing" tendency in fall. The mean AP levels and AP: TP ratios generally decreased along soil profiles in three sampling seasons. TP stocks ranged from 419.40 mg m −2 to 578.45 mg m −2 and generally exhibited an increasing tendency from Site 1 to Site 5. Approximately 50% of TP stocks accumulated in the top 20 cm soils. Higher TP stocks in the top 60 cm soils were observed in summer and fall at each of five sampling sites than in spring (p b 0.05). Correlation analysis showed that Soil TP levels were significantly correlated with soil bulk density (BD) and salinity, and AP contents were significantly correlated with soil depth and pH values. TP stocks were significantly impacted by TP, BD and pH values.

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Section: Soil P Distribution Along Soil Profiles In Three Seasonsmentioning

confidence: 99%

Spatial and seasonal distributions of soil phosphorus in a short-term flooding wetland of the Yellow River Estuary, China

Gao

Han

Bai

et al. 2016

Ecological Informatics

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“…Olsen P is an important index for evaluating the capacity of a basic (high pH) soil to supply P, and it can predict P losses to surface water and groundwater [48,49]. Changes in Olsen P are shown in Figure 6.…”

Section: Relationships Between Olsen P and Dissolved P In Pore Watermentioning

confidence: 99%

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Tian

Dong

Karthikeyan

et al. 2017

Water

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Abstract:In flooded areas, soils are often exposed to standing water and subsequent drainage, thus over fertilization can release excess phosphorus (P) into surface water and groundwater. To investigate P release and transformation processes in flooded alkaline soils, wheat-growing soil and vegetable-growing soil were selected. We flooded-drained-reflooded two soils for 35 d, then drained the soils, and 10 d later reflooded the soils for 17 d. Dissolved reactive phosphorus (DRP), soil inorganic P fractions, Olsen P, pH, and Eh in floodwater and pore water were analyzed. The wheat-growing soil had significantly higher floodwater DRP concentrations than vegetable-growing soil, and floodwater DRP in both soils decreased with the number of flooding days. During the reflooding period, DRP in overlying floodwater from both soils was less than 0.87 mg/L, which was 3-25 times less than that during the flooding period. Regardless of flooding or reflooding, pore water DRP decreased with flooding days. The highest concentration of pore water DRP observed at a 5-cm depth. Under the effect of fertilizing and flooding, the risk of vertical P movement in 10-50 cm was enhanced. P diffusion occurred from the top to the bottom of the soils. After flooding, Al-P increased in both soils, and Fe-P, O-P, Ca 2 -P decreased, while Fe-P, Al-P, and O-P increased after reflooding, When Olsen P in the vegetable-growing soil exceeded 180.7 mg/kg and Olsen P in the wheat-growing soil exceeded 40.8 mg/kg, the concentration of DRP in pore water increased significantly. Our results showed that changes in floodwater and pore water DRP concentrations, soil inorganic P fractions, and Olsen P are significantly affected by fertilizing and flooding; therefore, careful fertilizer management should be employed on flooded soils to avoid excess P loss.

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“…"Soil-test P" (STP) procedures that were initially developed for crop nutrient recommendations have been adapted to environmental risk assessment for P loss [10][11][12][13]. Another approach used in P risk assessment involves a "change point" phenomenon, which corresponds to a threshold of P loading where a marked increase in solution P concentration is observed [14].…”

Section: Introductionmentioning

confidence: 99%

Soil Phosphorus Storage Capacity for Environmental Risk Assessment

Nair¹,

Harris²

2014

Advances in Agriculture

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Reliable techniques must be developed to predict phosphorus (P) storage and release from soils of uplands, ditches, streams, and wetlands in order to better understand the natural, anthropogenic, and legacy sources of P and their impact on water quality at a field/plot as well as larger scales. A concept called the "safe" soil phosphorus storage capacity (SPSC) that is based on a threshold phosphorus saturation ratio (PSR) has been developed; the PSR is the molar ratio of P to Fe and Al, and SPSC is a PSR-based calculation of the remaining soil P storage capacity that captures risks arising from previous loading as well as inherently low P sorption capacity of a soil. Zero SPSC amounts to a threshold value below which P runoff or leaching risk increases precipitously. In addition to the use of the PSR/SPSC concept for P risk assessment and management, and its ability to predict isotherm parameters such as the Langmuir strength of bonding, , and the equilibrium P concentration, EPC 0 , this simple, cost-effective, and quantitative approach has the potential to be used as an agronomic tool for more precise application of P for plant uptake.

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Development of an Indicator for Risk of Phosphorus Leaching

Cited by 232 publications

References 0 publications

Spatial and seasonal distributions of soil phosphorus in a short-term flooding wetland of the Yellow River Estuary, China

Spatial and seasonal distributions of soil phosphorus in a short-term flooding wetland of the Yellow River Estuary, China

Phosphorus Dynamics in Long-Term Flooded, Drained, and Reflooded Soils

Soil Phosphorus Storage Capacity for Environmental Risk Assessment

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