液培条件下钾细菌对土壤养分的活化作用研究

Dissolving Effect of the Silicate Bacteria to Soil Nutrients

采用液体培养法研究供试钾细菌在有Ｎ、无Ｎ培养条件下，对黄砂和黄绵土中矿物态Ｋ，Ｐ，Ｓｉ，Ｃａ，Ｆｅ，Ｍｎ和Ｚｎ的生物活化作用。结果表明：①供试钾细菌以淀粉、蔗糖和葡萄糖为碳源时均有一定产酸作用。以黄砂和黄绵土为磷钾源时培养液ｐＨ分别降低１．２～１．８和０．７～１．２；②接种钾细菌能促进黄砂和黄绵土中矿物态Ｋ，Ｐ，Ｓｉ，Ｃａ，Ｆｅ及Ｍｎ元素的显著活化，较不接种对照分别提高２７．９％～３９．２％，１９．３％，１６．１％～７１．０％，３４２．０％，１５０．６％及１４６３．９％；③钾细菌在无Ｎ培养条件下对矿物态养分的活化作用优于含Ｎ培养；

The dissolving effect of the silicate bacteria to the K,P,Si,Ca,Fe,Mn and Zn elements in the mineral of loess soil and sand at the culture condition with nitrogen and no nitrogen by the liquid culture and chemical analyses methods.The results indicated that:①The silicate bacteria tested can produce acid in the liquid culture with the carbon source of starch,glucose and sucrose.The pH of the cultural liquid decreased 1.2～1.8 pH unite and 0.7～1.2 pH unite at adding sand and loess soil to supporting the phosphorous potassium element, respectively.②The quantity of the K, P,Si,Ca,Fe and Mn elements dissolved enhanced 27.9%～39.2%,19.3%,16.1%～71.0%, 342.0% ,150.6% and 1463.9% than the check experiment by the silicate bacteria,respectively.③The dissolving effect of the silicate bacteria to the elements in the mineral was strong in the culture with nitrogen than without nitrogen.④ The zinc element didnt dissolved by silicate bacteria in loess soil.