红壤上小麦对磷肥的响应及其机理  

Response of Wheat to Phosphate Fertilizer on Red Soil and Its Mechanism

作　　者：张富林[1,2] 董晓英[1] 曾其龙[1,2] 沈仁芳[1] 

机构地区：[1]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏南京210008 [2]中国科学院研究生院,北京100049

出　　处：《江苏农业学报》2009年第1期112-116,共5页Jiangsu Journal of Agricultural Sciences

基　　金：中国科学院国际合作项目(CXTD-Z2005-04)

摘　　要：缺磷是酸性土壤上作物生长的重要限制因子之一,但在研究酸性土壤磷缺乏问题时大多不顾及铝毒害的问题。本试验研究了小麦在红壤上对磷肥的响应特点,并主要从磷和铝相互作用的角度对其响应特点的原因进行了探讨。结果表明,在红壤上小麦对磷肥没有明显的响应;在磷铝交替处理条件下,铝在高磷下对小麦的毒害比低磷下更严重,提高供磷水平能促进铝在小麦根系中的累积。在高磷下铝对小麦毒害更为严重可能是小麦对磷肥表现不出明显响应的原因之一。Phosphorus deficiency is one of the most important factors limiting plant growth on most acid soils. However, phosphorus deficiency is usually studied without considering the influence of aluminum toxicity. In this study, the effect of phosphate fertilizer on growth of wheat in red soil was studied from the perspective of interaction of phosphorus and aluminum. Results showed that wheat hardly responded to phosphate fertilizer. Under P-A1 intermittent condition, the toxicity of aluminum on growth of wheat at high P supply level was severer than that at low P supply level. Aluminum accumulation in roots of wheat was increased by increasing P supply. The severer toxicity of aluminum on wheat at higher P supply level may be one of the reasons that wheat had little response to phosphate fertilizer on acid soils.

关 键 词：红壤 小麦 磷肥肥效 铝毒 

分 类 号：S512.11[农业科学—作物学] S143.22