摘要
以含钙较高的褐土为供试土壤,系统研究了草酸、柠檬酸和磷肥对土壤/纯碳酸钙中磷素和钙素有效性的影响。结果表明:添加外源低分子量有机酸促进了土壤中钙素和磷素的释放,对钙素的活化能力为草酸<柠檬酸,对磷素的活化能力为草酸>柠檬酸。磷肥的添加明显抑制了土壤中钙素的活化。有机酸和磷肥综合作用后褐土中有效性钙素含量增加。外源有机酸和磷对纯碳酸钙中钙素有效性的影响与土壤相似。外源有机酸通过降低土壤溶液中钙素的含量进而提高了土壤中磷素的有效性。
Using cinnamon soils as the representative of calcareous soil,the effect of oxalic acid,citric acid and phosphorus on calcium availability in soil/CaCO3 were studied.The results showed that adding low-molecular-weight organic acids promoted the release of phosphorus in soil;the activating ability of organic acids for phosphorus followed the order,oxalic acid〉citric acid.Adding low-molecular-weight organic acids also could promote the calcium activation in soils;but the activating ability of organic acids for calcium followed the order,oxalic acid〈citric acid.Adding phosphorus fertilizer significantly inhibited calcium activation in soil.Under the combined action of organic acid and phosphate fertilizer effectiveness calcium content increased in soil.The effect of exogenous organic acid and phosphorus on calcium in CaCO3 was similar with soil.Therefore,exogenous organic acids could increase phosphorus effectiveness by reducing the content of calcium element in soil solution.
出处
《北方园艺》
CAS
北大核心
2015年第15期161-165,共5页
Northern Horticulture
基金
国家自然科学基金资助项目(41401323)
辽宁省自然科学基金资助项目(2014027010)
关键词
外源有机酸
磷
钙
石灰性褐土
extraneous organic acids
phosphorus
calcium
cinnamon soil
