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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。
The decay of coarse woody residues (CWD) is the key process of transporting residual nutrients from shoots to soil and determines the retention efficiency and intensity of carbon and nitrogen in forest soils to a certain extent. In this study, the decomposing process of Antrodiella gypsea (Ag) and Fomitopsis pinicola (Fp) in the typical forest of Changbai Mountain was selected as experimental materials. Three soil samples with different horizontal distance from the edge of inverted wood were selected as the test materials The spatial distribution and composition of soil total organic carbon (SOC) and total nitrogen (TN) were analyzed. The results showed that the increment of SOC under brown rot condition was significantly lower than that of white rot fungus near the inverted wood (horizontal distance 0 ~ 30 cm), while the former was significantly higher than the latter at distant fallen wood (horizontal distance 100 cm). In terms of TN increment, brown rot conditions were significantly higher than white rot. Furthermore, it can be concluded that the brown rot condition is more effective than white rot to effectively promote the retention of carbon and nitrogen in forest so as to reduce the forest ecosystem carbon emissions caused by the decomposed vegetation.