Little is known about temporal variation in carbon cycling with tree phenology in lowland Bornean tropical rainforests where there is little seasonality in temperature and precipitation. In such forests, unpredictable drought may be a key to understand tree phenology and temporal variation in carbon cycling. Thus, the objective of this study is to know how respiration and production of root and stem change with soil water availability. Respiration and growth for stem, LAI, soil and fine root respiration and fine root biomass were measured more than seven times and relationships of those factors with soil water availability were examined. Woody tissue respiration was positively related with soil water content. Stem growth was different among tree species, but stem growth was low in severe dry period and high in wet period for most tree species. LAI was also increased with soil water content. On the other hand, soil respiration and fine root respiration and biomass were not related to soil water availability. These results imply that temporal variation in carbon cycling in this forest is relatively conservative even though there is clear phenology for some tree species with soil water availability.