【摘要】 磷素径流损失是农田磷素流失的主要途径,为了解水稻田磷素径流流失动态特征及常规施肥产生磷素径流负荷,对广东省典型水稻田在自然降雨条件下产生径流水进行连续定位监测试验。结果表明:广东省水稻生产期磷素径流流失量为2.87～13.99kg/hm2,降雨量与产流量之量极显著正相关,但对P素流失量无明显影响;不施肥与常规施肥处理均存在P素径流损失,与未施肥对照(F0)相比,常规施肥(F)对P素流失没有显著影响(P>0.05),P素流失形态以颗粒态磷(PP)为主。磷素的径流损失量受径流水量大小的影响无明显体现,常规施肥不是影响广东省水稻田磷素径流损失的主要因素。更多还原

【Abstract】 Runoff loss of phosphorus was the main way of its loss from field. Four in-situ experiments were conducted to investigate the typical rice fields in Guangdong province, South China under the condition of natural rainfall for understand the runoff loss characteristic of phosphorus and runoff loads of phosphorus of conventional-fertilization. The results showed that phosphorus loss of four rice field was 2.87-13.99 kg/hm2,conventional-fertilization treatment (F) affected insignifcantly (P>0.05) the runoff loss of phosphorus in comparison with F0. The majority of formation of phosphorus runoff loss was particulate phosphorus (PP). Effective control of phosphorus run-off is a prerequisite for understanding the loss of farmland phosphorus in the process and characteristic. Therefore, the loss of runoff water and phosphorus had no significant relationship. Conventional fertilization is not a major factor in the impact of phosphorus runoff losses in rice fields in Guangdong Province.更多还原