不同养分元素对致病性尖孢镰刀菌在土壤团聚体中分布的影响

发布时间：2018-05-07 00:20

  本文选题：致病性尖孢镰刀菌 + 土壤团聚体　； 参考：《江苏农业学报》2017年02期

【摘要】：为了解致病性尖孢镰刀菌在土壤团聚体中分布状况并从土壤养分方面弄清其分布机制,本试验将土壤灭菌后接种致病性尖孢镰刀菌,并分别添加不同养分元素(有机物、氮、钾、钠、钙、镁、铜、锌、铁、锰)培养15 d后,通过干筛法将土壤筛分为4种粒径团聚体(4.0 mm、2.1~4.0 mm、1.1~2.0 mm、≤1.0 mm),测定土体土及团聚体中尖孢镰刀菌数量。结果表明,添加有机物显著增加了土体土中尖孢镰刀菌数量,而添加氮、钙、镁、铜、锌、铁、锰显著降低了土体土中尖孢镰刀菌数量。添加不同养分元素显著改变了尖孢镰刀菌在不同粒径团聚体中的分布。通过相关性分析发现,土体土中尖孢镰刀菌数量与1.1~4.0 mm粒径团聚体中尖孢镰刀菌数量显著相关。据此推测,不同养分元素主要是通过影响尖孢镰刀菌在1.1~4.0 mm粒径团聚体中定殖状况而最终影响土体土中尖孢镰刀菌的生长。
[Abstract]:In order to understand the distribution of Fusarium oxysporum in soil aggregates and the mechanism of soil nutrient distribution, soil was inoculated with Fusarium oxysporum after sterilization, and different nutrient elements (organic matter, nitrogen, nitrogen) were added to the soil. Potassium, sodium, calcium, magnesium, copper, zinc, iron and manganese) were cultured for 15 days. The soil was screened by dry sieving method into 4 aggregates with diameter of 4.0 mm ~ 2.1 ~ 4.0 mm ~ (-1) ~ 2.0 mm, 鈮，

本文编号：1854559