In a four-month investigation of litter fall and its decay as well as soil respiration underChromolaena odoratacanopy, 1970 kg ha−1of dry matter were collected. There was a significant negative correlation (r = −0.62; P< 0.01) between litter fall and atmospheric relative humidity. Of the 43.9% of the litter degraded from litter bags, 35.7% of it was lost in the first month. A significant correlation (r = 0.93; P<0.01) between CO2evolution from the vegetation floor and litter degradation was obtained.