石灰性土壤小麦根际pH及磷动态变化的研究

本文采用网隔栽培室种植小麦，置于人工气候室内生长，对不同温度条件下土小麦根际及距根不同距离土体中ｐＨ，Ｏｌｓｅｎ-Ｐ及无机磷组分动态变化进行了研究。主要结果有:（１）根际及０～３ｍｍ土体ｐＨ较低，而３～８ｍｍ和８～５０ｍｍ土体ｐＨ较高；（２）Ｏｌｓｅｎ-Ｐ含量为根际＜０～３ｍｍ土体＜３～８ｍｍ和８～５０ｍｍ土体，温度升高，各土层Ｏｌｓｅｎ-Ｐ含量呈降低趋势；（３）距小麦根系越近，Ca2-P、Ａｌ Ｐ、Ｆｅ-Ｐ和Ca8-P含量越低，Ｏ-Ｐ和Ca10-P变化不明显；随时间延长和温度升高，Ca10-P含量有所增加，Ca2-P、Ａｌ-Ｐ、Ｆｅ-Ｐ和Ca8-P含量有所降低，Ｏ-Ｐ含量变化不大

DYNAMIC OF pH AND PHOSPHORUS OF WHEAT RHIZOSPHERE IN CALCAREOUS SOIL

The net separation culture pots were empoyed to plant winter wheat Those pots were put into E8H artificial climate box The pH, Olsen P and inorganic phosphate form in cumulic cinnamon soil under vary temperature conditions were studied The results showed that: (1) the pH of wheat rhizosphere and 0～3 mm soil layer were higher than that of 3～8mm and 8～50mm soil layers; (2) the furthest from the wheat roots, the content of Olsen P was higher and the content of Olsen P was reduce with the temperature ; (3) In more near from the wheat roots, the content of Ca₂-P, Al-P, Fe-P and Ca₈-P, was lower, and the content of O-P and Ca₁₀-P had no obvious change With growth time prolonged and temperature raised , the content of Ca₁₀-P was inerease, Ca₂-P, Al-P,Fe-P and Ca₈-P were decrease, and O-P had no obvious change