秸秆还田对半干旱区农田土壤养分含量及玉米光合作用的影响

为了提升和保育辽西半干旱区农田土壤质量,采用盆栽试验的方式探讨了不同处理方式、不同用量玉米秸秆还田对土壤养分含量的影响。结果表明,秸秆还田后,其土壤含水量比对照组提高了3%~7%;有机质含量比对照组提高幅度为1.9%~19%;全氮含量比对照组提高幅度为0.7%~14.4%;速效磷含量比对照组提高了2.51~14.75 mg/kg;速效钾含量比对照组提高了7.33~188.07 mg/kg;碱解氮含量比对照组提高了8.46mg/kg;净光合速率比对照组提高了3~11.03 CO2μmol/(m2.s);秸秆还田可以缓解土壤碱化。

Effects of returning straw to field on soil nutrient content and corn photosynthesis in semiarid region

In order to improve and conserve soil in semiarid region of west Liaoning,the effects of returning straw to field with different forms and doses on soil nutrient content were investigated by pot experiment.The results showed that compared to the control group,the soil water content in the treatments of returning straw to field increased by 3%～7%,the soil organic matter increased by 1.9%～19%,soil total nitrogen by 0.7%～14.4%,available phosphorus by 2.51～14.75 mg/kg,available potassium by 7.33～188.07 mg/kg,alkali-hydrolysable nitrogen by 8.46 mg/kg,net photosynthetic rate of corn by 3～11.03 CO2 μmol/(m2·s).The straw returning also alleviated soil alkalization.