文章摘要
田 磊.不同林龄泡桐根系分泌物对土壤酶活性和微生物的影响[J].林业调查规划,2022,47(6):28-33
不同林龄泡桐根系分泌物对土壤酶活性和微生物的影响
Effects of Paulownia fortunei Root Exudates of Different Ages on Soil Enzyme Activities and Microorganisms
  
DOI：
中文关键词: 泡桐  根系分泌物  土壤酶活性  土壤微生物  土壤肥力
英文关键词: Paulownia fortunei  root exudates  soil enzyme activity  soil microorganisms  soil fertility
基金项目:磷施肥对武夷山常绿阔叶林土壤微生物量及其群落组成的调控技术研究（闽林科便函〔2020〕9号）.
作者单位
田 磊 商丘市园林绿化中心，河南 商丘 476000 
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中文摘要:
      收集5 a、10 a、15 a林龄泡桐根系分泌物，以不进行根系分泌物处理作为对照，研究不同林龄泡桐根系分泌物对土壤肥力、土壤酶活性和微生物数量的影响。结果表明：试验以10 a处理效果最佳，与CK处理相比，土壤有机质含量增加了61.27%，土壤速效氮、磷、钾分别增加了57.48%、22.22%、40.38%，土壤脲酶、过氧化氢酶、磷酸酶和转化酶活性分别增加了37.56%、31.64%、25.05%、7.88%，土壤细菌、放线菌和真菌数量分别增加了60.37%、94.56%、53.72%，根系分泌物有助于提高土壤肥力，增加土壤有机质和速效氮磷钾含量，提高土壤酶活性，增加土壤微生物数量，并随着泡桐林龄的增加呈先增加后降低趋势；土壤微生物数量与土壤酶活性、有机质、速效氮磷钾之间呈正相关关系，土壤酶活性和微生物数量可以作为土壤肥力高低的重要指标。
英文摘要:
      The root exudates of 5, 10 and 15 years old Paulownia fortunei were collected to study the effects on soil fertility, soil enzyme activity and microorganism. The results showed that the 10 a treatment had the best effect, compared with the CK treatment, soil organic matter content increased by 61.27%, soil available nitrogen, phosphorus and potassium increased by 57.48%, 22.22% and 40.38% respectively, soil urease, catalase, phosphatase and invertase activities increased by 37.56%, 31.64%, 25.05% and 7.88% respectively, and the number of soil bacteria, actinomycetes and fungi increased by 60.37%， 94.56% and 53.72% respectively. The study indicated that root exudates was conducive to improve soil fertility, increase the content of soil organic matter and available nitrogen, phosphorus and potassium, improve soil enzyme activity and increase the number of soil microorganisms, which first increased and then decreased with the increase of forest age; the number of soil microorganisms was positive correlation with soil enzyme activity, organic matter, available nitrogen, phosphorus and potassium,so soil enzyme activity and the number of microorganisms could be used as important indicators of soil fertility.
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