Tillage effects on phosphorus fractions of freshwater wetlands
In order to discuss the influence of reclamation on wetland soil P, a modified Hedley P fractionation method was employed to compare the variations of P fractions between wetland soil, farmland and abandoned farmland in Sanjiang Plain, China. It can be found that the content of total inorganic P (TP...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2008-05-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2008.03.013 |
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| Summary: | In order to discuss the influence of reclamation on wetland soil P, a modified Hedley P fractionation method was employed to compare the variations of P fractions between wetland soil, farmland and abandoned farmland in Sanjiang Plain, China. It can be found that the content of total inorganic P (TPi) increased 319.67 mg·kg<sup>-1</sup> after 3-year tillage (G3), and the labile and secondary available P<sub>i</sub> increased in a wider range (P<0.05), while the total organic P (TP<sub>o</sub>) decreased 313.28 mg·kg<sup>-1</sup>. The content of P<sub>i</sub> decreased with tillage time. For 8-year tillage (G8) soil, the contents of Resin-P, NaHCO<sub>3</sub>-P<sub>i</sub> and NaOH-P<sub>i</sub> were only 28.18%, 42.87% and 45.90% respectively, as much as those for G3. The content of P<sub>o</sub> increased with tillage time, but only NaOH-P<sub>o</sub> presented a relative larger increment (P>0.05). The status of soil P in abandoned farmland tended to approach that of wetland. The content of all the P fractions increased after abandoned, except Conc. HCl extracted fraction, however the P<sub>o</sub> increased in a comparatively lower speed. The content of secondary available P varied in the widest range, which is the main source and sink of P in the wetland of Sanjiang Plain. |
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| ISSN: | 1008-9209 2097-5155 |