Spatial variation of soil phosphorus in the water level fluctuation zone of the Three Gorges Reservoir: Coupling effects of elevation and artificial restoration

Qin, Dongming; Li, Shanze; Wang, Jingfu; Wang, Dengjun; Liao, Peng; Wang, Yuchun; Zhu, Zhiqiang; Dai, Zhihui; Jin, Zuxue; Hu, Xinping; Qiu, Shuoru; Ma, Yiming; Chen, Jingan

doi:10.1016/j.scitotenv.2023.167000

Cited by 4 publications

(1 citation statement)

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“…PSI is commonly employed to assess the quantity of phosphorus in the soil that may be discharged into the liquid phase ( Chen et al., 2003 ), while DPS indicates the extent to which phosphorus has been adsorbed by the soil, serving as an indicator of its capacity to absorb and retain phosphorus ( Huang et al., 2004 ). Nevertheless, the potential for transportation and discharge of phosphorus from soils also significantly differs depending on various environmental factors ( Qin et al., 2023 ). Several studies have indicated that temperature, acidity level, type of ions, and concentration of ions can all exert an influence on this phenomenon ( Zhu et al., 2015 ; Sharma et al., 2023 ).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus adsorption characteristics and release risk in saline soils: a case study of Songnen Plain, China

Jiang,

Yan,

Liu

et al. 2023

Front. Plant Sci.

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IntroductionThe Songnen Plain is one of the three major saline-alkali areas in China, covering a vast area, where drought and overgrazing have exacerbated the salinization trend, and will have great potential for development if utilized rationally. Phosphorus, as one of important soil nutrients, plays a crucial role in plant growth. How to minimize its loss and migration has become a current research hotspot. The objective of the present study was to elucidate the adsorption properties of phosphorus in soils affected by salinization and to establish the correlation between the potential for phosphorus release and soil properties.MethodsA batch treatment test was conducted in this study using three soils with the various salinization degrees to examine the impact of environmental factors on the adsorption properties and potential release of phosphorus.Results and discussionIt was found that the maximum phosphorus adsorption by the three salinization soils in 0-360 minutes accounted for 86.8%-90.5% of the total adsorption capacity; the equilibrium adsorption capacity was: HS> MS> LS. In cases where the phosphorus level in the surrounding liquid is low, the three levels of salinized soils exhibited varying levels of phosphorus discharge, with the adsorbent acting as the origin of contaminants. The Pseudo-second-order model kinetics and Langmuir equation can well describe the adsorption process, and the adsorption process is spontaneous heat absorption with entropy increase. Increasing the pH led to an increase in the adsorption of phosphorus from the three salinized soils. Additionally, the adsorption was enhanced by introducing varying concentrations of Na+, Ca2+, and Al3+ to the background solution. The phosphorus eutrophication release risk (ERI) demonstrated a gradual decline as temperature increased. Correlation analysis revealed a noteworthy positive correlation between TN, TP, and ERI, as well as a significant negative correlation between CEC, K+, and ERI. Furthermore, there was a highly significant negative correlation between coarse silt and fine silt. Considering local climatic and environmental factors is crucial for controlling the adsorption capacity of phosphorus in various salinized soils, as it can unveil the mechanism of phosphorus adsorption and impact its migration and release risk.

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