Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China

ZHOU Li-li; HUANG Dong-hao; FAN Hao-ming; JIA Yan-feng

doi:10.13961/j.cnki.stbctb.2014.06.012

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Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China

- Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China
- Bulletin of Soiland Water Conservation Vol. 33, Issue 6, Pages: 27-31(2014)
- 作者机构：
  
  沈阳农业大学水利学院,辽宁,沈阳,110866
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.06.012
  CLC：
- Published：2014
- 稿件说明：
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ZHOU Li-li, HUANG Dong-hao, FAN Hao-ming, et al. Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 27-31.
DOI：

ZHOU Li-li, HUANG Dong-hao, FAN Hao-ming, et al. Effects of Freezing-Thawing Cycles on Phosphorus Adsorption and Desorption Characteristics in Black Soil of Northeast China[J]. Bulletin of Soiland Water Conservation, 2014, 33(6): 27-31. DOI： 10.13961/j.cnki.stbctb.2014.06.012.

摘要

冻融作用对土壤理化性质具有重要影响

从而影响土壤中磷素的吸附-解吸特性。以东北黑土为研究对象

采用室内模拟冻融环境的方法

研究了冻融条件下黑土磷素吸附-解吸行为。结果表明

冻融条件下黑土对磷的吸附规律均随着外源磷浓度增加而逐渐增大

当外源磷浓度为120 mg/L时吸附曲线出现明显拐点;与未冻融土壤相比

冻融过程中土壤吸附更多的磷

具有更高的磷素吸附率;外源磷浓度低时

冻融作用对土壤磷吸附影响较大

外源磷浓度高时冻融作用对土壤磷吸附影响降低;冻融条件下磷等温吸附曲线采用Langmuir方程拟合的相关性最优

在连续的冻融循环条件下

土壤磷最大吸附量P

max

值逐渐增大

土壤与磷之间结合能力和磷吸附最大缓冲容量也有同样的趋势。

Abstract

Freezing-thawing cycles have important effects on physical and chemical properties of soil

which affect adsorption and desorption characteristics of phosphorus in soil. A laboratory experiment was conducted to determine the effects of freezing-thawing on phosphorus adsorption and desorption characteristic of black soil. The results showed that

the trend of phosphorus adsorption in freezing-thawing treatment was that all the phosphorus adsorption capacity increased with the increasing of phosphorus concentration

and there was obvious turning point when the exogenous phosphorus concentration was 120 mg/L. Compared to the no freezing-thawing treatment samples

black soil adsorbed more phosphorus and had higher adsorption rate after freezing-thawing cycles. At low exogenous phosphorus concentration

freezing-thawing cycles have relatively large influence on phosphorus adsorption quantity

on the contrary

at high exogenous phosphorus concentration

the influence reduced. In the condition of freezing-thawing

phosphorus adsorption curves could be well fitted by Langmuir equation. Under the condition of successive freezing-thawing cycles

maximum adsorption capacity Pmax

combining ability between soil and phosphorus and phosphorus adsorption maximum buffer capacity has the same trend of gradual increase.

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references

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