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异丙甲草胺对芹菜根际与非根际生物活性的影响

陈波;徐冬梅;刘广深;刘维屏   

  1. 浙江大学环境科学研究所,杭州 310029
  • 收稿日期:2005-05-27 修回日期:2006-02-10 出版日期:2006-05-18 发布日期:2006-05-18

Effects of metolachlor on biological activities in celery rhizophere and non-rhizosphere soil

CHEN Bo;XU Dongmei;LIU Guangshen;LIU Weiping   

  1. Institute of Environmental Science,Zhejiang University,Hangzhou 310029,China
  • Received:2005-05-27 Revised:2006-02-10 Online:2006-05-18 Published:2006-05-18

摘要: 通过根际袋法土培试验,研究了异丙甲草胺对芹菜根际与非根际土壤酶活性、土壤微生物数量的影响以及异丙甲草胺在根际与非根际土壤中的降解特性.结果表明,异丙甲草胺对土壤过氧化氢酶活性有一定的抑制作用,对土壤脱氢酶活性有激活作用.一般情况下根际土壤酶活性均要大于非根际土壤.异丙甲草胺作用45 d后,芹菜根际土壤细菌、真菌数量大于非根际土壤,根际效应R/S在1.76~2.51之间;异丙甲草胺对土壤放线菌数量影响不大,根际效应不明显.异丙甲草胺在根际土壤与非根际土壤中的降解速率分别为0.0217和0.0176,相应的半衰期分别为31.9和39.4 d.在根际土壤中异丙甲草胺更易降解.

关键词: 红树林, 木榄, 盐胁迫, 热值, 能量

Abstract: The study with rhizobag showed that in celery rhizophere and non rhizosphere soil,metolachlor had a certain inhibitory effect on catalase activity,but stimulated dehydrogenase activity.Generally,the enzyme activities in rhizosphere soil were higher than those in non-rhizosphere soil.After 45 days of metolachlor treatment,the numbers of bacteria and fungi in rhizosphere soil were higher than those in non-rhizosphere soil,and the R/S was 1.76~2.51.The numbers of actinomycetes were relatively stable,and the rhizosphere effect was not significant.The degradation rate of metolachlor in rhizosphere and nonrhizosphere soil was 0.0217 and 0.0176,and the corresponding half-live was 31.9 and 39.4 days,respectively.The degradation of metolachlor was enhanced greatly in rhizosphere soil.

Key words: Mangroves, Bruguiera gymnorrhiza, Salt stress, Caloric value, Energy