Abstract:In order to understand the effects of Cinnamomum camphora litter leaves on the growth of crops and soil microbial biomass C and N, the morphological and physiological characteristics of three crops, such as lettuce (Lactuca sativa), eggplant (Solanum melongena) and cabbage (Brassica chinensis), and soil microbial biomass C and N were studied by supplied litter leaves of C. camphora with different dosage in pots. The results showed that the decomposition of C. camphora litter leaves inhibited the growth (leaf area, leaf number) and biomass accumulation of three crops. The inhibition effects were stronger with increment of litter dosage, but those were stronger at first and then weaker along the time. The contents of malondialdehyde (MDA) and soluble sugar (SS) in leaves of three crops treated with litter leaves increased significantly at early stage (20-40 days after sowing), but the soluble protein (SP) content decreased significantly. At the later stage (80 days after sowing), the difference of MDA content among the treatments was not significant, and the promoting effect of SS content was also significantly reduced, but the inhibiting effect of SP content was still continuous. The contents of soil microbial biomass carbon and biomass nitrogen increased significantly, which increased with the increment of litter dosage, and decreased slowly along the time. Therefore, allelochemicals decomposed from C. camphora litter leaves would act in two ways:on the one hand, it affects the accumulation of osmotic regulation substances, such as soluble protein, soluble sugar in crops, on the other hand, it affects the available nutrient supply by changing soil microbial biomass. Finally, it had a significant influnence on the vegetative growth and biomass accumulation of crops.
