An experimental study on the effects of freeze-thaw cycles on phosphorus adsorption-desorption processes in brown soil

被引：19

作者：

Wang, Qingzhi ^{[1
,2
]}

Liu, Jiankun ^{[2
]}

Wang, Lingqing ^{[3
]}

机构：

[1] Qinghai Res Inst Transportat, Xining 810016, Qinghai, Peoples R China

[2] Beijing Jiaotong Univ, Sch Civil Engn, Beijing 100044, Peoples R China

[3] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China

来源：

RSC ADVANCES | 2017年 / 7卷 / 59期

基金：

中国国家自然科学基金;

关键词：

ORGANIC-MATTER; CLIMATE-CHANGE; NITROGEN; SORPTION; CARBON; BIOAVAILABILITY; PHOSPHATE; DYNAMICS; IMPACTS; ECOSYSTEMS;

D O I：

10.1039/c7ra05220k

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Freeze-thaw cycles (FTCs) can strongly influence the physical and chemical properties of soils in cold regions, which can in turn affect the adsorption-desorption characteristics of phosphorus (P) in the soil. In this study, a series of one-dimensional laboratory freeze-thaw experiments were conducted to determine the adsorption-desorption behavior of P in soil. Results showed that greater numbers of FTCs were associated with a decrease in the adsorption capacity of P in soil. Langmuir and Freundlich equations were adopted to fit the isothermal adsorption curves of P in soil. Values of the critical fitting constant indicated that FTCs weakened the absorption capacity of P in soil. At identical concentrations of exogenous P, the P desorption ratio for soil samples treated with FTCs was greater compared with the ratio measured in untreated soil.

引用

页码：37441 / 37446

页数：6

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