Abstract: Taking Microcystis aeruginosa as test material, SPE-HPLC was adopted to study the degradation of microcystin-LR by Rhodopseudomonas palustras. Under the conditions of anaerobic, light intensity 2000 lx, 35 ℃, pH 7.0, carbon source sodium acetate, and initial concentration OD₆₈₀ of the bacilli being 0.325, R. palustras could degrade 36.5% and 78.7% of the microcystin-LR with an initial concentration 3 mg·L^-1 in 6 d and 12 d, respectively. These degradation conditions were basically the same environmental conditions of algal blooms, and hence, R. palustras could have practical value for removing microcystin-LR from the water body during algal blooms.

Key words: nitrogen-fixing tree species, monoculture plantation,  , mixed plantation, soil microbial community, phospholipid fatty acid, south subtropical China.