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phosphate distribution and Movement in Soil-Root In-terface Zone: II. The Infinence of Soil Water Contentand Application Rates of phosphate

引用

Pedosphere 1995年第3期5卷 267-274页

作者： XUMING－GANG ZHANGYI－PING 等 DepartmentofSoilScience NorthwesternAgriculturalUniversityYanglingShaanxi712100China DepartmentofS

The phosphate in the soil-root interface zone under various soil water contents and application rates ofphosphate was still of depletion distribution which could be described by a power function in the form ofC/Co= ax￣b(C/Co is the relative content of fertilized phosphate in a distance from the root surface x, a andb are the regression constants). The depletion rate of phosphate in soil near the root surface was higher andthe depletion range was narrower under lower soil moisture. On the contrary, at higher soil water content thedepletion range was wider, generally The application rate of phosphate led to the greater depletion intensityof phosphorus was higher in the heavier texture soils. In general, the depletion intensity in the soils, whichdecreased with increasing clay content or *** buffering power of soil, decreased in the order as loessalsoil and black fou soil> lou soil> yellow cinnamon soil when 50 or 100 mg of phosphorus were applied in theform of KH_2PO_4. This result indicated that the phosphate distribution and its movement in the soil-rootinterface zone closely related with the buffering capacity of soil.

关键词： application rate of phosphate phosphate distribution soil-root interface zone soil watercontent

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phosphate　distribution　and　Movement　in　Soil－Root　In－terface　Zone：Ⅲ．Dynamics

引用

Pedosphere 1995年第4期5卷 349-355页

作者： XUMING－GANG ZHANGYI－PING 等 DepartmentofSoilScience NorthwesternAgriculturalUniversityYanglingShaanxi712100China DepartmentofS

The depletion rate of phosphate in the soil-root interface zone increased along with growth and phosphateuptake of wheat or maize, which indicated that the phosphate distribution in soil near the root surfaceagreed well with the phosphate movement in rhizosphere and phosphate uptake by plant. The relativeaccumulation zone of phosphate within 0.5 mm apart from the root surface developed at the 15th day or soafter cultivating wheat or maize since the root phosphate secretion increased gradually in this stage. Thephosphate distribution in the soil-root interface zone against the growing time (t) and the distance from theroot plane (x) could be described by the non-linear regression equation with the third powers of x and t.

关键词： dynamics phosphate distribution soil-root interface zone

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