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Transformation of phosphorus forms and its regulation on phosphorus availability across differently degraded marsh soils
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  • Shirong Zhang,
  • Yulin Pu,
  • Yuanjun Luo,
  • Ting Li,
  • Dagang Yuan,
  • Xiaoxun Xu,
  • Hongyu Qian,
  • Guiyin Wang,
  • Yong-Xia Jia,
  • Yun Li
Shirong Zhang
Sichuan Agricultural University - Chengdu Campus

Corresponding Author:[email protected]

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Yulin Pu
Sichuan Agricultural University - Chengdu Campus
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Yuanjun Luo
Sichuan Agricultural University - Chengdu Campus
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Ting Li
Sichuan Agricultural University - Chengdu Campus
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Dagang Yuan
Sichuan Agricultural University - Chengdu Campus
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Xiaoxun Xu
Sichuan Agricultural University - Chengdu Campus
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Hongyu Qian
Sichuan Agricultural University - Chengdu Campus
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Guiyin Wang
Sichuan Agricultural University - Chengdu Campus
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Yong-Xia Jia
Sichuan Agricultural University - Chengdu Campus
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Yun Li
Sichuan Agricultural University - Chengdu Campus
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Abstract

Soil phosphorus (P) is an essential nutrient that controls wetland productivity and ecological functions. However, the effects of soil P forms on P availability during wetland degradation are relatively unknown. Soil samples from differently degraded marshes, including relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), and heavily degraded marsh (HDM), were collected to investigate the changes in soil P forms and its regulation on P availability in the Zoige Plateau, China. We observed that compared with RPM, the main changes in total P concentration were a significant increase of 31.6%–44.2% in the 0–30 cm soil layers of LDM and MDM, and the available P concentration increased in LDM and MDM but decreased in HDM with a lower P activation coefficient. Marsh degradation increased the concentration and proportion of dicalcium phosphates, P occluded in iron hydroxides, and organic P but decreased those of iron oxide surfaces adsorbed P and apatite P. Soil available P was mainly related to organic P and P non-occluded in iron oxide minerals that might also be non-negligible direct source of available P. The transformation from apatite P to organic P was an important regulation mechanism of P availability in soils during marsh degradation. This study revealed the risk of P limitation in heavily degraded marsh soils and established the mechanism by which marsh degradation significantly influences soil P availability. Therefore, some measure of on improving P availability should be implement for the ecological restoration of heavily degraded marsh in the future, such as grazing exclusion and the application of organic fertiliser.
09 Nov 2022Submitted to Land Degradation & Development
09 Nov 2022Submission Checks Completed
09 Nov 2022Assigned to Editor
11 Nov 2022Review(s) Completed, Editorial Evaluation Pending
12 Nov 2022Reviewer(s) Assigned
08 May 2023Editorial Decision: Revise Major
27 May 20231st Revision Received
27 May 2023Review(s) Completed, Editorial Evaluation Pending
27 May 2023Submission Checks Completed
27 May 2023Assigned to Editor
29 May 2023Reviewer(s) Assigned
06 Jun 2023Editorial Decision: Revise Major
04 Jul 20232nd Revision Received
04 Jul 2023Submission Checks Completed
04 Jul 2023Assigned to Editor
04 Jul 2023Review(s) Completed, Editorial Evaluation Pending
08 Jul 2023Reviewer(s) Assigned
23 Jul 2023Editorial Decision: Revise Minor
07 Aug 20233rd Revision Received
07 Aug 2023Submission Checks Completed
07 Aug 2023Assigned to Editor
07 Aug 2023Review(s) Completed, Editorial Evaluation Pending
19 Aug 2023Reviewer(s) Assigned
28 Aug 2023Editorial Decision: Accept