Dynamics of root exuded carbon and its relationships with root traits of rapeseed and wheat

Quantifying carbon in root exudates and exploring their influencing factors are essential to understand soil organic dynamics cropland. A pot experiment was carried out explore quantitative relations between exuded traits wheat rapeseed. The result showed that rapeseed had a similar pattern exudation intensity (EI) as the wheat, but its EI per plant obviously higher than wheat. Rapeseed plants biomass early growth period lower late period. both crops significant exponential relationships with specific length (RL), surface area (RSA), volume (RV), C/N ratio soluble sugar content. However, of markedly quadratic relationship RL, RSA, RV biomass. During whole period, cumulative 14.09 g/plant, which almost twice plant. Root close crops. Quantitative regression models them could be referred estimate C farmland.