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对福建建瓯万木林自然保护区内细柄阿丁枫天然林(ALG)、米槠天然林(CAC)和35年生杉木人工林(CUL)土壤可溶性有机氮含量(SON)进行了研究.结果表明:3种林分中,ALG0～5cm、5～10cm和10～20cm层土壤SON含量最高,分别为95.3、78.3和72.5mg.kg-1,且与其余林分差异显著(P<0.05);而CAC与CUL各土层SON含量分别为74.5、70.1、65.6mg.kg-1和78.6、68.9、69.1mg.kg-1.CAC、CUL和ALG在0～20cm土层的SON含量分别占可溶性总氮(TSN)组分的79.17%～80.78%、68.64%～74.51%和59.97%～69.66%,随着土层加深,3种林分SON含量占土壤TSN和全氮(TN)含量的比例不断增大;SON与土壤有机碳含量极显著相关(r=0.982,P<0.01),与TSN、TN、铵态氮和硝态氮等土壤养分也存在不同程度的相关性.土壤SON含量与森林类型、地形、海拔以及树龄等因素有关.
The contents of soil soluble organic nitrogen (SON) in Alnus cremastogyne natural forest (ALG), natural cedar forest (CAC) and 35-year old Chinese fir plantation (CUL) in Jian’ou Wanmulin Nature Reserve in Fujian Province were studied. The results showed that the content of SON in 0, 5 cm, 5 ~ 10 cm and 10 ~ 20 cm layers of ALG was the highest (95.3,78.3 and 72.5 mg.kg-1, respectively) ; While the contents of SON in soil CAC and CUL were 74.5,70.1,65.6mg.kg-1 and 78.6,68.9,69.1mg.kg-1.C SON content of CAC, CUL and ALG in 0-20cm soil layer accounted for The content of soluble total nitrogen (TSN) was 79.17% -80.78%, 68.64% -74.51% and 59.97% -69.66%, respectively. With the deepening of soil layers, the content of SON in three stands accounted for the content of soil TSN and total nitrogen (R = 0.982, P <0.01), but also correlated with soil nutrients such as TSN, TN, ammonium nitrogen and nitrate nitrogen, etc. SON content in soil was significantly correlated with soil organic carbon content And the type of forest, topography, elevation and age and other factors.