摘要
在灰棕紫泥水稻土上,杂交水稻土壤水溶性磷和有效磷,在根——土界面的浓度最低,随着根距的增加而上升。根——土界面Ca-P减少最多,其次是Fe-P和Al-P水稻根际pH降低,根系H ̄+分泌增加,可能是促进Ca-P转化的主要原因。在低磷或无磷条件下,根系H+分泌增加可视为磷胁迫下作物的一种适应性反应。
A greenhotise pot experiment was conducted with hybrid rice to studypbosphorus(P) status and plant P utilization in the grey brown purplish rhizosphere soil .It was foundthat water-soluble P and available P were much lower on the rootsoil sarface nearby than faraway, Also, it was indicated that Ca-P decreased considerably in rhizosphere soil ascompared with Fe-Pand Al-P. Furthermore, the decrine of the rhizosphere soil pH wascaused by the increase of H+ secretion by the rice roots,and it may be a primarily factorthat Ca-P was transfered to other P status. Therefore,increase of H + ecretion by rice roots under low P or no P conditions can be considered a beneficial adaptation.
出处
《西南农业大学学报(自然科学版)》
CSCD
1995年第5期440-442,共3页
Journal of Southwest Agricultural University
基金
四川省应用基础研究
关键词
水稻
磷
根际
杂交水稻
paddy
phosphorus/rhizosphere