不同水分管理条件下秸秆还田方式对作物养分吸收、产量及土壤培肥的影响

盆栽试验结果表明，常规淹水和无水层栽培，秸秆还田的水稻产量提高，油菜秸秆和小麦秸秆处理之间差异不显著，秸秆不同利用方式以覆盖效果较好。秸秆还田处理的后茬油菜产量比不施秸秆的提高1.8%～9.3%。对氮磷钾吸收的影响，常规淹水多于无水层栽培，但秸秆还田能促进氮磷钾的吸收利用。无水层栽培比常规淹水栽培的土壤有机质等养分提高，说明无水层栽培条件下更利于还田秸秆的养分释放和土壤对养分的保持。

Effects of Straw-returning Manner on Nutrient Uptake,Yield and Soil Fertility Maintaining under Different Water Managements

In this paper,the pot-cultivation experiment was conducted to investigate the effect of straw-returning manner on nutrient uptake,yield and soil fertility maintaining under different water managements.The results showed that straw returning could increase the rice yield in both conventional flooded cultivation and wet irrigation cultivation.while rape straw treatment was not significantly different from the wheat straw treatment.And the straw covering was best.Moreover,the following rape yield with straw returning treatment was also increased by1.8%-9.3% compared with no straw treatment.In addition,as for the effect on nutrient uptake,conventional flooded cultivation was higher than wet irrigation cultivation,but straw-returning could promote nutrient uptake and use.So wet irrigation cultivation could improve soil organic matter content compared to conventional flooded cultivation.Therefore,this indicated that wet irrigation condition was benefit for the nutrient release of returning straw and maintainment of soil nutrient.