低分子量有机酸对红壤无机态磷转化及酸度的影响

应用生态学报 ›› 2002, Vol. ›› Issue (7): 867-870.

低分子量有机酸对红壤无机态磷转化及酸度的影响

胡红青, 廖丽霞, 王兴林

华中农业大学农业部亚热带土壤资源与环境重点实验室, 武汉 430070

收稿日期:2000-06-05 修回日期:2000-11-19
通讯作者: 胡红青,男,1966年生,博士,副教授,从事土壤肥力、土壤化学等研究,发表论文50余篇.E-mail:hqhu@mail.hzau.edu.cn
基金资助:
中国科学院红壤生态实验站开放基金;国家“九五”科技攻关项目(960040307).

Effect of low molecular weight organic acids on inorganic phosphorus transformation in red soil and its acidity

HU Hongqing, LIAO Lixia, WANG Xinglin

Key Laboratory of Subtropical Soil Resource & Environment, MOA, Huazhong Agricultural University, Wuhan 430070

Received:2000-06-05 Revised:2000-11-19

摘要/Abstract

摘要： 以鄂南、赣北两红壤样品为材料,加入不同有机酸并经室温培养后,测定不同P组分、pH及活性Al含量的变化.结果表明,供试有机酸均使土壤Ca₂-P含量增高,增幅大小依次为柠檬酸>苹果酸>琥珀酸>乙酸;2种土壤的Ca₈-P和Ca₁₀-P含量无明显变化规律,FeP、AlP和OP含量有所下降;除乙酸处理的土壤pH值无显著变化外,其它有机酸的加入使pH下降0.65～1.96;有机酸引起活性Al量增多,除乙酸处理的变化较小外,其它有机酸或混合物的加入使土壤中0.02mol·L^-1CaCl₂提取Al增加4.7～50.3倍,1mol·L^-1KCl提取Al增加4.0～67.3倍.可见,有机酸具有双重作用,既增加P的有效性,又增强土壤酸度和Al毒.

关键词: 低分子量有机酸, 红壤, 无机态磷, 酸度, 红松林, 敏感性指数, 凋落物质量, 土壤湿度, 凋落物分解

Abstract: Red soil samples collected from southern Hubei province and northern Jiangxi province were tested to analyze their inorganic phosphorus fractions,pHand active aluminum after incubated with added various organic acids.The results indicated that application of organic acids increased the content of Ca₂-P in both red soils,in the order of citric acid>malic acid>succinic acid>acetic acid,did not affect the contens of Ca₈-P and Ca₁₀-P,but usually reduced Fe P,Al Pand O P.The pHvalues of the soils treated by organic acids,except for acetic acid,were reduced by 0.65～1.96,compared with the control.Soil active Al extracted with 0.02 mol·L^-1 CaCl₂ in treatments with citric,malic and succinic acid was 5.7～51.3 tmes as the control,and Al extracted with 1 mol·L^-1 KCl also increased 4.0～67.3 times.However,acetic acid had little influence on active soil Al.It was concluded that in red soils, organic acid could improve phosphorus availability,but enhance the soil toxicity caused by active Al

Key words: Low molecular weight organic acid, Red soil, Inorganic phosphorus, Acidity, soil moisture, litter quality, litter decomposition, sensitivity index, Korean pine forest

中图分类号:

S153.6⁺1

胡红青, 廖丽霞, 王兴林. 低分子量有机酸对红壤无机态磷转化及酸度的影响[J]. 应用生态学报, 2002, (7): 867-870.

HU Hongqing, LIAO Lixia, WANG Xinglin . Effect of low molecular weight organic acids on inorganic phosphorus transformation in red soil and its acidity[J]. Chinese Journal of Applied Ecology, 2002, (7): 867-870.

参考文献

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