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生态学杂志 ›› 2009, Vol. 28 ›› Issue (08): 1550-1554.

• 研究报告 • 上一篇    下一篇

低分子量有机酸对大豆磷积累和土壤无机磷形态转化的影响

王树起1, 2;韩晓增1;严君1;李晓慧1;乔云发1   

  1. 1中国科学院东北地理与农业生态研究所;2中国科学院沈阳应用生态研究所
  • 出版日期:2009-08-10 发布日期:2009-08-10

Effects of low molecular weight organic acids on P accumulation in soybean ( Glycine max  L.) and inorganic P form transformation in soil.

WANG Shu qi 1,2;HAN Xiao zeng 1;YAN Jun 1;LI Xiao hui 1;QIAO Yun fa 1   

  1. 1Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences;2Institute of Applied Ecology, Chinese Academy of Sciences
  • Online:2009-08-10 Published:2009-08-10

摘要: 采用土培试验方法研究了低分子量有机酸(柠檬酸、草酸、苹果酸及其混合酸)对大豆磷积累和土壤无机磷形态转化的影响。结果表明:低分子量有机酸促进了大豆植株磷的吸收积累,大豆不同生育时期,不同有机酸对大豆磷的吸收积累均有促进作用,但作用效果有差异;外加低分子量有机酸使无机磷总量、难溶态磷(Ca10-P、Al-P和O-P)含量均显著降低,而可溶态磷的Ca8-P含量显著增加,柠檬酸和草酸使Ca2-P含量显著增加,表明低分子量有机酸促进了土壤难溶态磷向可溶态磷转化,作用大小顺序为柠檬酸>草酸>混合酸>苹果酸;同时,大豆根系分泌物也促进部分难溶态磷向可溶态磷转化,使无机磷总量、除Ca2-P外的其他无机磷组分均有所降低,按磷释放比例的大小来看,对大豆吸磷的贡献大小顺序为O-P>Fe-P>Ca10-P>Al-P>Ca8-P>Ca2-P。

关键词: 水稻, 化感作用潜力, 生物测试方法, 应用

Abstract: A pot experiment with black soil was conducted to study the effects of low molecular weight organic acids (LMWOAs) citric acid, oxalic acid, malic acid, and their mixture on the P accumulation in soybean ( Glycine max  L.) and the inorganic P form transformation in soil. LMWOAs promoted the P adsorption and accumulation in soybean plants, but the effect differed with growth stage. Applying LMWOAs decreased the contents of soil total inorganic P and unavailable P (Ca10-P, Fe-P, Al-P, and O-P), but increased the contents of soil available P (Ca2-P and Ca8-P), suggesting that LMWOAs promoted the transformation of soil unavailable P to available P. The effect of test LMWOAs was in the order of citric acid > oxalic acid > mixed acid > malic acid. Moreover, the exudates from soybean roots also promoted the transformation of soil unavailable P to available P, resulting in the decrease of soil total inorganic P and its fractions except Ca2-P. The contribution of soil inorganic P fractions to the P uptake by soybean was O-P > Fe-P > Ca10-P> Al-P > Ca8-P >Ca2-P.

Key words: Oryza sativa, Allelopathic potential, Bioassay method, Application