【摘要】 粗木质残体(CWD)腐解是地上部植物残体养分向土壤输送的关键过程,在一定程度上决定了森林土壤碳氮养分固持效率与强度。本研究选取长白山典型林木的白腐菌(Antrodiella gypsea,Ag)和褐腐菌(Fomitopsis pinicola,Fp)腐解过程为研究对象,以距倒木外缘不同水平距离的3个土壤样品作为供试材料,分析其土壤总有机碳(SOC)及总氮(TN)含量的空间分布与组成特征。结果表明,近倒木处(水平距离0~30 cm),褐腐条件下SOC增量显著低于白腐菌;在远倒木处(水平距离100 cm),前者显著高于后者。就TN增量而言,褐腐条件显著高于白腐。进而表明,褐腐条件较白腐更能有效促进森林土壤碳氮养分的有效固持,从而减少植被残体矿化腐解引起的森林生态系统碳排放。更多还原

【Abstract】 Coarse woody debris(CWD) decay is the key progress of aboveground plant residues incorporated into soil.This progress determines the efficiency and strength of the immobilization of soil carbon and nitrogen in forest soil.This research focused on the typical wood rot fungi(Antrodiella gypsea, Ag and Fomitopsis pinicola, Fp), and selected soil samples from three vertical depths(0 ~ 5 cm, 5 ~ 10 cm, 10 ~ 15 cm) and five horizontal distance(0 cm, 10 cm,20 cm, 30 cm, 100 cm) from dead log, and then analyzed the spacial distribution and component characteristics of soil organic carbon(SOC) and total nitrogen(TN). Result showed that the increment of SOC in brown rot funfi(BR)associated soil was significantly lower than that in white rot fungi(WR) associated soil at short distance from logs(0 ~30 cm), and was significantly higher than that in WR associated soil at long distance from logs(100 cm). The increment of TN in BR associated soil was also significantly higher than that in WR associated soil. From the above,the BR associated soil could immobilize more efficient nutrient than WR, and thus reduce the carbon release from the forest ecosystem caused by the mineralization and decay of plant residues.更多还原