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Organic/inorganic phosphorus partition and transformation in long-term paddy cultivation in the Pearl River Delta, China.
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- المؤلفون: Tang, Xian1,2 (AUTHOR); Liu, Hongyi1 (AUTHOR); Qin, Hailong1 (AUTHOR); Zhao, Jianrong2 (AUTHOR); Wang, Hong2 (AUTHOR); Li, Bo1 (AUTHOR) ; Lu, Ying1 (AUTHOR)
- المصدر:
Scientific Reports. 7/10/2023, Vol. 13 Issue 1, p1-16. 16p.
- الموضوع:
- معلومة اضافية
- الموضوع:
- نبذة مختصرة :
Identification and quantification of different soil phosphorus (P) fractions level are important for improving agricultural productivity and developing sustainable management practices in these agricultural soils under long-term cultivation. However, few studies have been conducted to investigate P fractions level and their transformation in these soils. This study was conducted to characterize P fractions as affected by different paddy cultivation ages (200, 400-yr and 900-yr) among soils of the Pearl River Delta Plain in China. A sequential chemical fractionation scheme and 31P nuclear magnetic resonance spectroscopy (31P NMR) were employed to quantify various P fractions and speciation. Results showed soil easily-labile P, moderately-labile P and non-labile P had a positive relationship with total P (TP) and available P (AP). Analysis with 31P NMR spectroscopy revealed that inorganic P including orthophosphate (Ortho-P) and pyrophosphate (Pyro-P) increased with cultivation age, while organic species monoester phosphate (Mono-P) and diester phosphate (Diester-P) decreased. Moreover, acid phosphatase (AcP), neutral phosphatase (NeP), exchangeable Ca and sand contents are the main factors that affected the transformation of soil P composition, and non-labile P (Dil.HCl-Pi) and Pyro-P had significant contribution to soil P availability by affecting P activation coefficient. Therefore, long-term paddy cultivation, influenced by these soil parameters including NeP, AcP, exchangeable Ca and sand, accelerated the transformation of soil organic P/non-labile P to inorganic P. [ABSTRACT FROM AUTHOR]
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