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Sustainability 2018, 10(5), 1574; https://doi.org/10.3390/su10051574

Adsorption and Desorption of Phosphorus in Biochar-Amended Black Soil as Affected by Freeze-Thaw Cycles in Northeast China

1,†
,
2,†
and
1,*
1
School of Forestry, Northeast Forestry University, 26 Hexing Road, Harbin 150040, China
2
Department of Forest Environment Protection, Kangwon National University, Chuncheon 24341, Korea
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 10 April 2018 / Revised: 7 May 2018 / Accepted: 14 May 2018 / Published: 15 May 2018
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Abstract

Substantial soil phosphorus (P) losses often occur in the northern temperate regions owing to soil freeze-thaw cycles (FTCs). Presumably, biochar amendment is an efficient method of conserving P and sustaining agricultural production in the black soil region of northeast China. However, how biochar interacts with FTCs to affect soil P adsorption and desorption is unclear. A simulated laboratory FTC experiment was conducted on untreated and biochar-amended soil with varying moisture content to assess their effects on P adsorption and desorption. Soil P adsorption and desorption values were fitted with Langmuir and Freundlich isotherms to determine the interaction of the frequency of FTCs with moisture content and biochar amendment. Higher soil moisture content increased soil P adsorption, whereas biochar amendment mitigated decreased P retention by decreasing soil P adsorption capacity. Biochar amendment significantly increased the desorption ratio (Davg) under all the FTCs. The desorption ratio of soil and biochar-amended soil in saturated moisture content treatment was significantly higher than that of 12 FTCs. The FTCs decreased the P availability of biochar-amended soil by enhancing P desorbability. Our results suggest that biochar amendment in arable black soil should not be conducted during FTCs, particularly during snowmelt. View Full-Text
Keywords: batch equilibrium method; biochar amendment; black soil; freeze-thaw cycle; phosphorus availability batch equilibrium method; biochar amendment; black soil; freeze-thaw cycle; phosphorus availability
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Han, Y.; Choi, B.; Chen, X. Adsorption and Desorption of Phosphorus in Biochar-Amended Black Soil as Affected by Freeze-Thaw Cycles in Northeast China. Sustainability 2018, 10, 1574.

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