Fractionation and adsorption-desorption characteristics of phosphorus in newly formed wetland soils of Yellow River Delta, China

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1 第 43 卷第 4 期 Vol.43, No.4, 年 7 月 GEOCHIMICA July, 2014 孙军娜 1, 2, 徐刚 1*, 邵宏波 1 (1., ; 2., ) 摘要 : Hedley,, 93%,,, Ca/Al 18.6~33.4 mg/kg, 3.2%~5.9%,,, (0.05~5 mg/l),,, 70%~99%, 7%,, 关键词 : ; Hedley ; ; ; 中图分类号 : P595; X142 文献标识码 : A 文章编号 : (2014) Fractionation and adsorption-desorption characteristics of phosphorus in newly formed wetland soils of Yellow River Delta, China SUN Jun-na 1, 2, XU Gang 1* and SHAO Hong-bo 1 1. Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai , China; 2. University of Chinese Academy of Sciences, Beijing , China Abstract: A modified Hedley phosphorus (P) fractionation was used to study the P distribution seaward in the newly formed wetlands soils of Yellow River Delta. In addition, the adsorption-desorption experiments were performed to evaluate the ability of P retention and release in the sampled soils. The results showed that inorganic P remained the largest portion of total P (TP), accounting for more than 93% of TP. Due to the lower content of organic matter, the organic P was relatively low in these soils. Among the inorganic P, Dilute HCl-P was the dominated form, related with the content of Ca in soils. The content of available P was 18.6~33.4 mg/kg, accounting for only 3.2%~5.9% of TP in soils, which might restrict the growth of plants in the wetland system. Furthermore, it was found that the content of available P in the sampling site covered with plants was higher than that in the beach soils, indicating that the vegetation cover may enhance the accumulation of soil available P. According to the adsorption-desorption experiments, when the concentration of initial P addition was in the range of 0.05~5 mg/l, the P adsorption increased with the increase of initial P concentration. Moreover, the percentage of adsorption was 70%~99% while desorption rate was less than 7%. It could be concluded that in these soils, the capacity of P retention was high and the release potential was relatively low. Key words: phosphorus; Hedley fractionation; adsorption; desorption; Yellow River Delta 收稿日期 (Received): ; 改回日期 (Revised): ; 接受日期 (Accepted): 基金项目 : ( , ); (Y ); (KZCX2-YW-T14) 作者简介 : (1984 ),,, jnsun@yic.ac.cn * 通讯作者 (Corresponding author): XU Gang, gxu@yic.ac.cn, Tel: Geochimica Vol. 43 No. 4 pp July, 2014

2 第 4 期孙军娜等 : 黄河三角洲新生湿地磷分布特征及吸附解吸规律 347 0,, [1], - Chang-Jackson [2 4], Hedley,, [5 6] Tissen et al. [7] Hedley Hedley, [8 9] [10 11],,,, [12 13], [14], [10 11] [15 16],, 1 1.1,, S1 S5 5 ( 1) S1, S2, S3, S4, S5, 3 0~20 cm, 10 [17], ph (Salinity) (TOC) Al/Fe/Ca (Clay) (Slit) (Sand) Marlvern Mastersizer 2000F Hedley [4] 0.5 g 50 ml, 30 ml, [15] : (1) (Resin-P):, ; (2) NaHCO 3 : 0.5 mol/l NaHCO 3, (NaHCO 3 -P i ) (NaHCO 3 -P o ); (3) NaOH : 0.1 mol/l NaOH, (NaOH-P i ) (NaOH-P o ); (4) (Dil.HCl-P): 1 mol/l HCl, ; (5) :, (Conc.HCl-P i ) (Conc.HCl-P o ); (6) (Residual-P): H 2 SO 4 H 2 O 2,, Resin-P NaHCO 3 -P i NaHCO 3 -P o (Available-P, AP), NaOH-P i NaOH-P o, Dil.HCl-P Conc.HCl-P i Conc.HCl-P o, Residual-P Table 1 表 1 各采样点物理化学性质 Physical and chemical characteristics of five samples ph ( ) TOC (mg/g) (%) (%) Al (%) Ca (%) Fe (%) S1 N 37 45'48.90", E 119 9'58.00" S2 N 37 45'57.90", E 119 9'55.60" S3 N 37 46'5.22", E 119 9'53.04" S4 N 37 46'26.22", E 119 9'51.06" S5 N 37 47'52.00", E '43.60" SUN Jun-na et al.: Fractionation and adsorption-desorption characteristics of phosphorus in Yellow River Delta soils

3 年 g 50 ml, 10 ml 0.05 mg/l 0.1 mg/l 0.5 mg/l 1 mg/l 2 mg/l 5 mg/l ( KH 2 PO 4 ) 0.01 mol/l KCl, (27±2) 24 h, (5000 /min, 10 min),,,, 3, 0.05 mg/l 1 mg/l, ( ) 10 ml 0.01 mol/l KCl, (27±2) 24 h, (5000 /min, 10 min), 1.4, (P des ) ; (K d ), ; K d [18 19] Microsoft Excel 2010 OriginPro 7.5 Spss (TP) 558.5~702.3 mg/kg ( 2), S5 TP (OP), 18.6~33.4 mg/kg (IP), TP 93%~98% ( 2) [20] [21], [22], [23 25] 2, AP 18.4~25 mg/kg, TP 3.2%~5.9% 2, 3,,, 6.8~18.1 mg/kg 28.6~58.4 mg/kg 454.4~498.5 mg/kg, Dil.HCl-P, TP 61.5%~83.6%,, S2 S3, S3 S5 82%,, ( ), Tuchman et al. [26], Chen et al. [27] S4,, 2.2 3,, 0.05~0.5 mg/l, 99%,, 70%,, Sakadevan et al. [1] [28] Table 2 表 2 不同采样点各形态磷的含量 (mg/kg) Content (mg/kg) of different phosphorus fractions in five samples Resin-P NaHCO 3 -P i NaOH-P i D.HCl-P Conc.HCl-P i NaHCO 3 -P o NaOH-P o Conc.HCl-P o Residual-P S S S S S Geochimica Vol. 43 No. 4 pp July, 2014

4 第 4 期孙军娜等 : 黄河三角洲新生湿地磷分布特征及吸附解吸规律 349 表 3 各样点在不同浓度下吸附磷量 (mg/kg) Table 3 Phosphorus adsorption capacity (mg/kg) at different initial phosphorus concentrations for five samples P (mg/l) S1 S2 S3 S4 S ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ± ±2.51, K d : S3 (837) > S2 (666) > S5 (551) > S4 (486) > S1 (389) S3, S1 4, -,, 1 mg/l, 90%,, [29 31],, 表 4 各样点在不同浓度下磷解吸率 P des (%) Table 4 Phosphorus desorption rate (%) at different initial phosphorus concentrations for five samples P (mg/l) S1 S2 S3 S4 S , OP TOC (P < 0.01),, Dil.HCl-P Ca/Al, Dil.HCl-P [5] AP (P < 0.01), [32 33], S2 S3 Dil.HCl-P, AP, [34] (P < 0.01) S3, S1 [35], ~702.3 mg/kg, TP 3.2%~5.9% 93%~97%,, 表 5 土壤物理化学参数与土壤磷形态及吸附解吸参数的相关性分析 Table 5 Correlation analysis of physical-chemical characteristic of soils with their phosphorus fractions and adsorption-desorption parameters TP OP AP Dil.HCl-P K d P des TOC Ca Al TP 1 OP 0.48** 1 AP 0.52** 0.50** 1 Dil.HCl-P 0.74** ** 1 K d ** 0.67* 1 P des ** ** 1 TOC 0.44** 0.42** 0.51** * ** 0.75** 0.48** 0.92** 0.99** 0.56** 1 Ca * 0.48** ** 1 Al 0.32* ** * 0.54** 0.38* 1 : * ** , n = 15 SUN Jun-na et al.: Fractionation and adsorption-desorption characteristics of phosphorus in Yellow River Delta soils

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