Litter Inputs Control the Pattern of Soil Aggregate-Associated Organic Carbon and Enzyme Activities in Three Typical Subtropical Forests

Soil extracellular enzyme activities among aggregate fractions are critical to short-term microbial activity and long–term carbon dynamics in forest ecosystems, but little is known regarding the effects of types on soil different fractions. Three typical subtropical (Broadleaved forest, Moso bamboo Chinese fir forest) were selected, undisturbed samples (0–15 cm) collected. We investigated stability (mean weight diameter, geometric mean diameter fractal dimension), aggregate–associated organic (OC) functionality five enzymes (cellobiohydrolase, ?-glucosidase, ?-xylosidase, N–acetylglucosaminidase, leucine aminopeptidase) (>2 mm, 0.25–2 0.053–0.25 mm <0.053 mm). The results showed that proportion macro-aggregates, macro–aggregates associated–carbon content storage higher broadleaved forests than forests, indicating influence distribution total OC fraction classes would delay loss forests. also found aggregates SEM (structural equation model) analysis supported significantly positive relationships between litter quantity activity, indirect impact C/N ratio together with (SOC) C (SAOCC) activity. this study indicate large aggregate-associated activities, input main control fractions, thus may play an important role adjusting sink capacity SOC.