论文部分内容阅读
无菌培养条件下,模拟缺磷胁迫时植物根系分泌的低分子量有机酸种类和数量,采用石灰性土壤无机磷分级方法,研究了低分子量有机酸对石灰性潮土无机磷形态转化的影响。结果表明:①在石灰性潮土中无机磷主要以有效性较低的磷酸钙盐(Ca10-P等)形式存在,而有效性较高的形式(Ca8-P等)含量较少,Ca2-P就更少。②有机酸通过结合土壤中可以使磷固定的Ca、Fe及Al,致使根际范围酸化,促进磷酸盐的形态转换,增加磷的有效性。这种促进能力因有机酸种类和性质的不同而异,其促进能力大小顺序为草酸>柠檬酸>酒石酸。
Under sterile culture conditions, the types and quantities of low molecular weight organic acids secreted by plant roots under simulated phosphorus deficiency were simulated. The effects of low molecular weight organic acids on transformation of inorganic phosphorus in calcareous alluvial soil were studied by using calcareous soil inorganic phosphorus fractionation method. The results showed that: (1) inorganic phosphorus mainly existed in the calcareous alluvial soil with less effective calcium phosphate salt (Ca10-P and so on), while less effective forms (Ca8-P and so on) P is even less. ② organic acids by combining the soil can make phosphorus fixed Ca, Fe and Al, resulting in rhizospheric acidification range, and promote the conversion of phosphate form, increase the effectiveness of phosphorus. The promoting ability varies with the type and nature of organic acids, and their promoting ability order is oxalic acid> citric acid> tartaric acid.