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