中文摘要：

利用13 C稳定同位素示踪技术，研究了杉木凋落物对杉木人工林表层（0～5cm）和深层（40—45cm）土壤有机碳分解、微生物生物量碳和可溶性碳动态的影响．结果表明：杉木人工林中深层土壤有机碳分解速率显著低于表层土壤，但其激发效应却显著高于表层土壤．杉木凋落物添加使土壤总微生物生物量碳和源于原有土壤的微生物生物量碳均显著增加，但对土壤可溶性碳没有显著影响．深层土壤被翻到林地表层，可能加速杉木人工林土壤中碳的损失．

英文摘要：

By using 13 C stable isotope tracer technique, this paper studied the effects of Chinese fir litter addition on the soil organic carbon （SOC） decomposition, microbial biomass carbon, and dis- solved organic carbon in 0-5 cm and 40-45 cm layers. The decomposition rate of SOC in 40-45 cm layer was significantly lower than that in 0-5 em layer, but the priming effect induced by the Chinese fir litter addition showed an opposite trend. The Chinese fir litter addition increased the soil total microbial biomass carbon and the microbial biomass carbon derived from native soil significant- ly, but had less effects on the soil dissolved organic carbon. Turning over the subsoil to the surface of the woodland could accelerate the soil carbon loss in Chinese fir plantation due to the priming effect induced by the litters.