摘要
采用特氟纶管采样法 ,原位、动态、实时地研究了水田 1 5～ 2 0cm层间流活性磷 (钼酸盐反应磷 ,MRP)的流失浓度及潜能 .研究表明 ,早稻生长期间水田层间流MRP浓度为 0 1 1 0～ 0 2 73mg/L ,晚稻生长期的MRP浓度为 0 0 85～ 0 2 85mg/L ;水田 1 5～ 2 0cm层间流磷素浓度差异与施用磷肥造成的土壤含磷水平大小直接相关 ,且随着土壤磷素的提高其流失潜能随之增加 ;
A special rice field experiment was conducted to investigate the characteristic and mechanism of phosphorus (P) loss potential in subsurface runoff from rice field. Teflon Suction Cups (TSC) were inserted into tested plots in 15～20 cm in the rice field for water sampling dynamically. The range of molybdate reactive phosphorus (MRP) in subsurface runoff were 0 110～0 273 mg/L, 0 085～0 285 mg/L during growth seasons of early rice and later rice, respectively. The magnitude of MRP concentrations in subsurface runoff in 15～20 cm from rice field was more consistent with trend of soil P accumulation (expressed as Olsen P) due to P application. P concentration and its expected loss loading in the subsurface runoff in 15～20 cm in the rice field were not affected by P application combined with manure.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2003年第2期46-49,共4页
Environmental Science
基金
国家自然科学基金项目 (499730 31)
浙江省科技计划项目 (99 2 0 30 )
关键词
磷素
稻田层间流
注失浓度
流失潜能
动态变化
phosphorus
subsurface runoff of rice field
loss concentration
loss potential
dynamic characteristic
