【摘要】 利用原状土柱通过人工灌溉 ,研究了不同施肥处理下太湖地区典型水稻土 (黄泥土 )在小麦生长季节中表层和底层土壤溶液中不同形态氮磷浓度的变化。氮磷钾肥的施用按基肥、拔节肥、穗肥 5∶3∶2的比例分次施用。结果表明 ,在小麦分蘖期、拔节期、抽穗期 ,表层土壤溶液中总磷浓度和铵态氮浓度逐渐提高 ;表层土壤溶液中硝态氮浓度和底层土壤溶液中各形态氮和磷的浓度均没有显著变化 ;土壤溶液中氮磷形态以有机态氮和无机态磷为主。提示 :太湖地区小麦生长季节土壤氮磷向水体迁移的环境风险在小麦抽穗期后相对较高。更多还原

【Abstract】 The dynamic changes of N and P concentrations after artificial irrigation were studied by using soil columns amended with different rates of N and P under the condition of wheat growth.Chemical fertilizers were applied at seeding,jointing,and earing stages of the wheat with the proportion of 5∶3∶2,respectively.Results showed that ammonium N and total P in soil solutions from top soil increased during wheat growth from tillering stage to earing stage.Nitrate N both in top soil and sub soil and total P and phosphate P in sub soil solutions had no significant change during wheat growth.Organic N and inorganic P respectively were the main parts of total N and total P in soil solutions.This implied that the relatively high risk of N and P losses through leaching and runoff in Taihu Lake region during season of wheat growth could probably occur after earing stage of the wheat growth.更多还原