不同土壤磷的固定特征及磷释放量和释放率的研究
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* 国家自然科学基金项目(NSFC40071051);国家重点基础研究发展规划项目(G1999011802)资助


CHARACTERISTICS OF FIXATION AND RELEASE OF PHOSPHORUS IN THREE SOILS
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    摘要:

    通过加入不同浓度的P(水土比为20:1)并利用连续提取法,对三种土壤P的固定特征以及磷的释放进行了研究.结果表明,红壤对P的固定能力高于潮土,而潮土高于水稻土,在加入P量为2.97gkg-1土壤的条件下,三种土壤对P的固定量分别为2.84gkg-1、2.53gkg-1和2.08gkg-1.三种土壤对P的固定率则随着加入P量的增加而降低.在P的释放研究中,随着提取次数的增加,P的释放量减少,并在提取8次后,以后各次P的释放量不发生显著变化.三种土壤中,水稻土P的最大释放量(12.407mgkg-1)显著高于红壤(60.46mgkg-1)和潮土(19.74mgkg-1),水稻土P的总释放量(16次)也大于红壤和潮土,三种土壤P的总释放量分别为206.02(19.8gkg-1土壤P处理)和27.191mgkg-1(2.97gkg-1土壤P处理)、100.48和260.53mgkg-1、116.06和131.91mgkg-1.三种土壤P的释放率随着提取次数的增加而增加,并逐渐达到稳定.水稻土的释放率显著高于红壤和潮土.水稻土和潮土中,1.98gkg-1土壤P处理的土壤P的释放率高于2.97gkg-1土壤P处理的土壤,红壤则相反.

    Abstract:

    In this experiment, characteristics of phosphorus fixation and release were studied with added different concentrations of P (water soil is 20 1) and by sequential extraction.The results showed that, fixing P capacity of red soil is higher than that of fluvo aquic soil, and fixing P capacity of paddy soil is lowest among three soils.Fixing P capacities of three soils are 2.84 g kg-1, 2.53 g kg-1 and 2.08 g kg-1 soil under treatment of P 2.97 g kg-1 soil.Ratio of P fixed to P added reduces with increase of added P.In release experiment, capacities of P release reduce with increase of extract ing times, and change insignificantly after 8 times of extraction.In three soils, maximum of P release of paddy soil (124.07 mg kg-1) is higher than that of red soil (60.46 mg kg-1) and fluvo aquic soil (19.74 mg kg-1), the similar results were obtained in total amount of P released.At the beginning of experiment, the ratio of P released to P fixed increases gradually and then reaches equilibrium with increase of extracting times, and that of P released in paddy soil is higher significantly than that of red and fluvo-aquic soils.Ratio of P released to P fixed of soils treated with 1.98 g P kg-1 soil is higher than that of soils treated with 2.97 g P kg-1 soil in paddy and fluvo-aquic soils, but the contrary result was obtained in red soil.

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李寿田,周健民,王火焰,陈小琴,杜昌文.不同土壤磷的固定特征及磷释放量和释放率的研究[J].土壤学报,2003,40(6):908-914. DOI:10.11766/trxb200206240616 Li Shou-tian, Zhou Jian-min, Wang Huo-yan, Chen Xiao-qin, Du Chang-wen. CHARACTERISTICS OF FIXATION AND RELEASE OF PHOSPHORUS IN THREE SOILS[J]. Acta Pedologica Sinica,2003,40(6):908-914.

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  • 收稿日期:2002-06-24
  • 最后修改日期:2003-05-27
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  • 在线发布日期: 2013-02-25
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