Distribution and Release Potential of Soil Phosphorus Fractions in Water-level Fluctuation Zone of the Tributary Bay, Three Gorges Reservoir

被引：0
|
作者：
Zhang X. [1 ,2 ]
Zhu B. [1 ]
机构：
[1] Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu
[2] University of Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 05期
关键词：
bioavailable phosphorus(Bio-P); degree of phosphorus sorption(DPS); phosphorus fractions; release risk; Three Gorges Reservoir; water-level fluctuation zone(WLFZ);
D O I：
10.13227/j.hjkx.202205097
中图分类号：
学科分类号：
摘要：
After repeated wetting-drying cycles, the migration and transformation of phosphorus in the water-level fluctuation zone (WLFZ) are accelerated, and the eutrophication of tributary bays in the reservoir becomes increasingly serious. Soils in the WLFZ of a typical tributary of the Three Gorges Reservoir were collected, and then phosphorus forms and the degree of phosphorus saturation (DPS) were determined to analyze the phosphorus release potential. The results showed that, ① the average contents of total phosphorus (TP), inorganic phosphorus (IP), and organic phosphorus (OP) of soils in the WLFZ were 771. 80, 485. 33, and 166. 30 mg.kg - 1 , respectively. The non-labile IP and OP were the dominate speciation of IP and OP, respectively. ② The distribution of P forms of soils in the WLFZ was affected by wetting-drying cycle. The contents of Ex-P and NaHCO3 -Po of soils in the WLFZ were significantly higher than those in the contrasted soils, whereas the contents of Fe-P, HCl-Po, and Fulvic-Po decreased significantly along the elevation (P <0. 05). The alternative wetting-drying cycle promoted the generation of labile P and the release and accumulation of moderately labile P of soils in the WLFZ. ③The content and proportion of bioavailable phosphorus (Bio-P) of soils in the WLFZ were in the range of 49. 19-148. 78 mg.kg - 1 and 7. 17%-24. 78%, and the degree of phosphorus sorption (DPS) was in the range of 5. 85%-22. 00%. At present, the phosphorus release risk of soils in the WLFZ was low. The soil at 170 m elevation requires further attention. Fe-P, HCl-Po, and Fulvic-Po contributed significantly to phosphorus release. The increase in pH promoted the release of Fe-P. Alkaline phosphomonoesterase (ALP) was an important participant in the transformation of OP. Additionally, organic matter (OM) was the main source of OP. © 2023 Science Press. All rights reserved.
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页码：2574 / 2582
页数：8
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共 51 条
  • [21] Sekhon B S, Bhumbla D K, Sencindiver J, Et al., Using soil survey data for series-level environmental phosphorus risk assessment, Environmental Earth Sciences, 72, 7, pp. 2345-2356, (2014)
  • [22] Jalali M, Jalali M., Relation between various soil phosphorus extraction methods and sorption parameters in calcareous soils with different texture [ J], Science of the Total Environment, 566-567, pp. 1080-1093, (2016)
  • [23] Wang C, Fang F, Yuan Z Y, Et al., Spatial variations of soil phosphorus forms and the risks of phosphorus release in the water-level fluctuation zone in a tributary of the Three Gorges Reservoir [ J], Science of the Total Environment, 699, (2020)
  • [24] Zhang H., Characteristic analyses of the water-level-fluctuating zone in the Three Gorges Reservoir, Bulletin of Soil and Water Conservation, 28, 1, pp. 46-49, (2008)
  • [25] Gee G W, Bauder J W., Particlesize analysis by hydrometer: a simplified method for routine textural analysis and a sensitivity test of measurement parameters, Soil Science Society of America Journal, 43, 5, pp. 1004-1007, (1979)
  • [26] Fu D G, Wu X N, Duan C Q, Et al., Response of soil phosphorus fractions and fluxes to different vegetation restoration types in a subtropical mountain ecosystem, CATENA, 193, (2020)
  • [27] Chang A C, Page A L, Sutherland F H, Et al., Fractionation of phosphorus in sludge-affected soils, Journal of Environmental Quality, 12, 2, pp. 286-290, (1983)
  • [28] Buehler S, Oberson A, Rao I M, Et al., Sequential phosphorus extraction of a <sup>33</sup>P-labeled oxisol under contrasting agricultural systems[J], Soil Science Society of America Journal, 66, 3, pp. 868-877, (2002)
  • [29] Ivanoff D B, Reddy K R, Robinson S., Chemical fractionation of organic phosphorus in selected histosols, Soil Science, 163, 1, pp. 36-45, (1998)
  • [30] Wang T, Wang K, Jiang X., Influence of rewetting process on distribution and release of phosphorus in sediments of East Lake Dongting[ J], Journal of Lake Sciences, 30, 4, pp. 937-947, (2018)
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