磷胁迫条件下小麦、蚕豆根系分泌物对红壤磷的活化  

Mobilizing Phosphorus in Red Soils by Root Exudates of Wheat and Broadbean under Phosphorus Stress Condition

作　　者：陈佰岩[1] 郑毅[1] 汤利[1] 

机构地区：[1]云南农业大学资源与环境学院,云南昆明650201

出　　处：《云南农业大学学报（自然科学版）》2009年第6期869-875,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：国家自然科学基金(30860157);"973"计划前期研究专项基金(2008CB117011);公益性行业(农业)科研专项基金(200803030)

摘　　要：通过室内盆栽试验研究了磷胁迫下小麦、蚕豆根系分泌物对石灰岩和玄武岩母质上发育的红壤中磷的活化效果。结果表明:在培养至第7 d时,小麦单作、蚕豆单作、小麦蚕豆混作的根系分泌物处理与对照相比,石灰岩母质上发育的红壤有效磷分别提高29.51%,22.16%,23.91%,玄武岩母质发育的红壤有效磷分别比对照提高6.3%,31.19%,31.20%。加入根系分泌物后的2种土壤在培养过程中土壤中的磷酸铝盐(Al-P)和磷酸铁盐(Fe-P)含量有所降低,闭蓄态磷(O-P)和磷酸钙盐(Ca-P)含量变化不大。可能的原因为根系分泌物通过对土壤中无机磷的Al-P和Fe-P的活化从而提高了土壤中磷的有效性。Incubation experiment to investigate the mobilization of phosphorus （P） in red soils with root exudates collected from wheat and broadbean under P stress condition were carried out. The results showed that in comparison with control （ pure water） , the available P of red soil developing from limestones treatments of root exudates of wheat, broadbean, wheat and broadbean mixture increased by 29.51%, 22. 16%, 23.91% respectively, those from basalts by 6.3%, 31.19%, 31.20% respectively. The contents of Al - P and Fe - P fraction of soil inorganic P decreased, and O - P, Ca - P fraction remained no change in both red soils developing from limestones and basahs in the incubation experiment. It is suggested that mobilizing soil inorganic P by Al - P and Fe - P can increase P availability.

关 键 词：磷胁迫 根系分泌物 活化 

分 类 号：S153[农业科学—土壤学]