有机肥对长豇豆连作土壤养分及酶活性的影响

以连作3年的长豇豆土壤为对象，研究了不同来源的有机肥料对长豇豆连作土壤有机质、速效养分含量及土壤酶活性的影响。结果表明，在收获后施用鸡粪、猪粪为主的有机肥的土壤有机质含量、土壤有效N、P、K含量显著高于施用海产品残渣有机肥的；施用化肥的土壤有效N、P、K含量显著高于施用有机肥的。不同有机肥处理均提高了土壤pH值，而硫酸钾型复合肥处理使土壤pH值降低。土壤酶活性分析结果表明，在长豇豆的各生育期内，不同肥源有机肥处理均提高了土壤过氧化氢酶、脲酶、多酚氧化酶和蔗糖酶的活性，而化肥处理降低了土壤酶活性。在长豇豆采摘盛期，土壤酶活性最高，各处理间差异显著，其中，鸡粪处理效果最好，猪粪处理次之。

Effects of organic fertilizers on soil nutrients and enzyme activities of continuous cropping soil of asparagus bean

In order to study the effects of different fertilizers on soil nutrients and enzyme activities， the present study was conducted in the field， where asparagus bean was continuously planted for 3 years. It was shown that chemical fertilizers and organic manures could increase the content of soil organic matter， soil available nitrogen， phosphorus and potassium. Application of organic fertilizers could increase the soil pH， while chemical fertilizers significantly lowered soil pH. Compared with the control， organic fertilizers could increase the activity of the soil catalase， urease， polyphenol oxidase and sucrose， while the chemical fertilizer treatment decreased soil enzyme activity. In the harvest stage， soil enzyme activity reached the highest level， and the differences between the treatments were significant in this stage. Among all the fertilizers， the effect of chicken manure was the best， which was followed by pig manure.