Abstract: Degradation of 1,2,4-TCB in soil was studied under both aerobic and anaerobic conditions. The results show that both aerobic and anaelxibic degradation of 1,2,4-TCB obeys the first order dynamics. Under same water content, temperature and initial concentration, the aerobic degradation is rapider than anaerobic one with half-lives of 1.89～5.86 and 5.07～19.08 days respectively. Initial concentration of 1,2,4-TCB significantly affected the degradation rate, with initial concentration ranging from 0 to 100μg·g^-1,higher concentration promotes the degradation. Higher temperature within the range of 10～30℃ accelerates the degradation due to the activation of microbial enzyme at high temperature.

Key words: 1,2,4-trichlorobenzene, Chlorobenzenes, Degradation, Half-life, subtropical forest, canopy reflectance, 4SAIL model, sensitivity analysis, PROSPECT5 model