秸秆还田条件下水稻-瓜菜轮作对土壤肥力的影响

Effect of Rice-Vegetable Rotation on Soil Fertility under Straw Returning

为了解秸秆还田条件下水稻-瓜菜轮作对土壤肥力的影响,本研究采用为期2年的连续田间试验,分别设置水稻-水稻(SS)、水稻-西瓜(SX)、水稻-青瓜(SQ)、水稻-豇豆(SJ)、水稻-黄秋葵(SH)和水稻-草莓(SC)等6个处理,测定并比较了试验前后土壤pH和土壤肥力指标的变化.研究结果表明,水稻连作时秸秆还田处理能够显著(P<0.05)提升土壤pH,但对土壤肥力无显著(P<0.05)影响;水稻-瓜菜轮作时秸秆还田,不仅能使土壤pH升高,还能有效提升土壤有机质、全量养分(全氮、全磷、全钾)及有效养分(碱解氮、有效磷、速效钾)含量,但水稻与不同种类瓜菜轮作时对土壤肥力的影响存在差异.

In order to conduct research on the effect of rice-vegetable rotation on soil fertility under straw returning,a field experiment,which lasted two years,was carried out.Six treatments—rice-rice (SS),rice-watermelon (SX),rice-cucumber (SQ),rice-cowpea (SJ),rice-okra (SH),and rice-strawberry (SC) —were set up,and soil pH and fertility indexes were examined before and after the experiment.The results showed that continuous rice cropping increased soil pH significantly (P < 0.05) under straw returning,while the soil fertility was unaffected.The treatments of rice-vegetable rotation and straw returning not only raised soil pH,but also promoted soil organic matter,total nutrients (total nitrogen,total phosphorus and total potassium) and available nutrients—alkali hydrolyzable nitrogen,available phosphorus and available potassium—content.The results also indicated that the effect of rotation of rice and various kinds of vegetables are different on soil fertility.