The simulated experiments were conducted to study effects of chloromethane included DCM

CF and CT on wheat seedling chlorophyll and soil respiration.The results showed that

the wheat chlorophyll were inhibited

and the inhibition was varied when the concentration of chloromethane was different.The more concentration was

the lower content of wheat chlorophyll was.The median inhibitory concentrations of DCM

CF and CT were 399.3 mg/kg

42.82 mg/kg

9.14 mg/kg

which indicated the toxicity of CT > CF > DCM.That was to say

the more H atoms were replaced

the more toxin would be.All the three chloromethane inhibited the soil respiration

and the inhibitions were stronger when the chloromethane concentrations increased.The inhibitory effects to soil respiration were temporary and would renew as the time last.