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土壤圈(英文版). 2000, (02)

Leaching and Redistribution of Nutrients in Surface Layerof Red Soils in Southeast ChinaEnglish Full Text

SUN BO; ZHANG TAOLIN and ZHAO QIGUO(Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Naniing 210008 China)

Abstract: The leaching and redistribution of nutrients in the surface layer of 4 types of red soils in SoutheastChina were studied with a lysimeter experiment under field conditions. Results showed that the leachingconcentrated in the rainy season （from April to June）. Generaily, the leaching of soil nutrients from thesurface layer of red soils was in the order of Ca ＞ Mg ＞ K ＞ NO3-N. In fertilization treatment, the totalamount of soil nutrients leached out of the surface layer in a red soil derived from granite was the highest inall soils. The uptake by grass decreased the leaching of fertilizer ions in surface layer, particularly for NO3-N.Soil total N and exchangeable K, Ca and Mg in the surface layer decreased with leaching and grass uptakeduring the 2 years without new fertilization of urea, Ca（H2PO4）2, KCl, CaCO3 and MgCO3. Ca movedfrom the application layer （0~5 cm） of fertilizer and accumulated in the 10~30 cm depth in the soils studiedexcept that derived from Quaternary red clay. The deficiency of soil exchangeable K will become a seriousdegradation process facing the Southeast China.
Keywords：

leaching; nutrients; red soils; redistribution; Southeast China;

  • Series：

    (D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy

  • Subject：

    Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S155.25

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