不同株龄田七根际土壤微生物和酶活性变化

发布时间：2018-06-21 02:45

本文选题：田七 + 根际土壤　；参考：《广西师范大学学报(自然科学版)》2017年03期

【摘要】：为减轻田七连作障碍、防治土传性病害,本文以不同株龄的田七Panax notoginseng根际土壤为实验材料,测定其细菌、真菌、放线菌数量及其酶活性相关指标的变化。结果表明:随着田七株龄的增加,其根际土壤细菌、真菌和放线菌的数量均有不同程度的减少,整体上各株龄田七植株根际土壤的细菌、真菌、放线菌数量之间差异显著,CK(未种过田七土壤)中土壤微生物数量最多,1年生土壤次之,3年生最少。从4月份至12月份:1年生田七根际土壤细菌减少23%~74%,真菌减少6%~37.5%,放线菌减少12%~66.7%;2年生田七根际土壤细菌减少18%~80.7%,真菌减少50%~60%,放线菌减少32%~79%;3年生田七根际土壤细菌减少37%~87.9%,真菌减少50%~75%,放线菌减少33%~52%。不同株龄田七根际土壤的过氧化氢酶、脲酶、中性磷酸酶活性均随着田七株龄的增加而降低,CK中土壤酶活性最高,1年生土壤次之,3年生最低。可见,田七根际土壤微生物和酶活性受株龄影响,随着田七株龄的增加,其根际土壤的微生物数量整体减少,中性磷酸酶、脲酶、过氧化氢酶的酶活性均下降。
[Abstract]:In order to reduce the obstacle of continuous cropping and control soil-borne diseases, the rhizosphere soil of Panax notoginseng with different plant ages was used as experimental material to determine the changes of bacteria, fungi, actinomycetes and their enzyme activity. The results showed that the number of bacteria, fungi and actinomycetes in rhizosphere soil decreased with the increase of plant age. There were significant differences in actinomycetes number among CK (no soil of Tianqi), followed by 1-year-old soil and 3-year-old soil. From April to December: 1 year old Tianqi rhizosphere soil bacteria decreased 2374, fungi decreased 637.5a, actinomycetes decreased 1266.70.2-year-old Tianqi rhizosphere soil bacteria decreased 1880.7, fungi decreased 50,6060,actinomycetes decreased 327.79, 3-year-old rhizosphere soil bacteria decreased 3787.9. The fungi are reduced by 50 and 75, and the actinomycetes by 33 / 52. The activities of catalase, urease and neutral phosphatase in rhizosphere soil of different plant ages all decreased with the increase of plant age. The soil enzyme activity was the highest in the CK, followed by the 1-year-old soil, and the lowest in 3-year-old soil. It can be seen that the microorganism and enzyme activity in rhizosphere soil were affected by plant age. With the increase of plant age, the number of microorganism in rhizosphere soil decreased, and the activities of neutral phosphatase, urease and catalase decreased.
【作者单位】：广西大学农学院;那坡县农业局;
【基金】：国家自然科学基金(31270076) 广西重大专项计划项目(桂科重1355001-1,桂科重14124002-1) 广西自然科学基金(2014GXNSFBA118152) 百色市科学研究与技术开发计划项目(百科计20141201)
【分类号】：S154;S567.236

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