青菜-萝卜轮作条件下镉对土壤微生物活性和磷脂脂肪酸特性的影响

被引:2
作者
申屠佳丽 [1 ,2 ]
何振立 [1 ,3 ]
杨肖娥 [1 ]
李廷强 [1 ]
机构
[1] 浙江大学环境与资源学院教育部环境修复与生态健康重点实验室
[2] 浙江工商大学环境科学与工程学院
[3] 佛罗里达大学印第安河研究教育中心食品与农业研究所
关键词
镉; 磷脂脂肪酸; 微生物生物量; 土壤基础呼吸; 轮作;
D O I
暂无
中图分类号
S154.3 [土壤微生物学];
学科分类号
071012 ; 0713 ;
摘要
通过盆栽试验研究青菜-萝卜轮作条件下2种不同类型人为镉污染土(红黄壤和小粉土)中不同处理对土壤微生物活性及磷脂脂肪酸(PLFAs)特性的影响.结果表明:蔬菜轮作条件下,2种土壤外源镉含量<1.00 mg·kg-1时,土壤微生物生物量碳增加,土壤基础呼吸作用略有减弱;随着外加镉浓度的增加,微生物生物量碳呈下降趋势,呼吸作用加强.种植萝卜后红黄壤微生物生物量碳含量降低,小粉土微生物生物量碳增加;2种土壤的基础呼吸速率均降低.不同蔬菜轮作对镉-微生物活性之间互动关系的影响不大.对磷脂脂肪酸图谱的分析结果表明,土壤微生物群落对镉胁迫较为敏感.真菌、革兰氏阳性菌以及灌木菌根真菌(AMF)随土壤镉含量的增加而增加,细菌、革兰氏阴性菌、放线菌则随土壤镉含量的增加而下降.真菌对镉胁迫的耐性最好,放线菌对镉胁迫最敏感.不同土壤类型、根际非根际土壤的PLFA剖面存在较大差异.根际土壤微生物受镉胁迫相对较小,群落结构较为稳定.对PLFAs的主成分分析结果表明,种植萝卜后土壤微生物群落结构更趋稳定.
引用
收藏
页码:569 / 577
页数:9
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