生态环境学报Issue(7)：1220-1225,6.
不同施磷量对土壤-玉米系统中镉生物有效性的影响
Effect of phosphate fertilizer on phytoavailability of cadmium in soil-corn system
摘要
Abstract
A field experiments were carried out to evaluate the available Cd in soil and Cd content in corn (Zea mays ssp. mays L.) with various application rate of phosphate fertilizer (0, 75, 150, 300 and 600 kg P·hm-2). The results showed that phosphate fertilizer could significantly increase the straw biomass and grain yield compared with CK. Meanwhile, the straw biomass and grain yield increased in a scope of 6.04%-11.39% (Spring corn) and 5.74%-8.01%(Autumn corn), 8.2%-13.1% (Spring corn) and 13.7%-20.0%(Autumn corn), respectively. In addition, phosphate fertilizer also decreased the Cd content in straw and grain with a scope of 2.7%-45.8%(Spring corn) and 11.0%-43.6%(Autumn corn), 13.0%-40.6%(Spring corn) and 9.9%-31.5%(Autumn corn), respectively. However, even though the grain and straw yield had not significantly changed under the increasing phosphate fertilizer conditions, the Cd concentration decreased both in straw and in grain especially at the P4 level was significant lower than those at the P1 and P2 level. Total Cd content in soil had not significantly changed after application of phosphate fertilizer, but soil pH and available P content increased with the increasing phosphate fertilizer. On the contrary, soil available Cd content decreased with the increasing phosphate fertilizer. Correlation analysis revealed that Cd accumulation in corn could be attributed primarily to immobilization of Cd by enhanced soil pH. Base on above result, the best application rate of phosphate fertilizer is P2 level (150 kg P·hm-2).关键词
磷肥/镉/土壤/生物有效性/玉米Key words
phosphate fertilizer/cadmium/soil/phytoavailability/corn分类
资源环境引用本文复制引用
区惠平,周柳强,刘昔辉,谢如林,黄金生,曾艳,黄美福,谭宏伟..不同施磷量对土壤-玉米系统中镉生物有效性的影响[J].生态环境学报,2013,(7):1220-1225,6.基金项目
广西农业科学院基金（2012YZ20；2013YQ01；2013YQ02）；农业部科技专项（201203030；201003014）；国家自然科学基金（U1033004）；广西自然科学基金 （）
