【摘要】 通过为期52 d的室内实验模拟胶州湾滨海湿地米草、碱蓬、芦苇枯落物的分解过程,测定枯落物及土壤中有机碳(TOC)、氮(N)和磷(P)含量,研究枯落物分解过程中枯落物-土壤养分的动态变化。结果表明:52 d的分解过程中,米草、碱蓬和芦苇枯落物碳损失分别占初始总碳含量的24.44%、74.20%和49.75%;土壤中碳发生净积累;米草枯落物中氮发生净积累,碱蓬枯落物中氮发生净释放,芦苇枯落物中氮先积累后释放,后两者枯落物氮损失分别占初始总氮含量的37.93%和4.81%;土壤中氮发生净积累;枯落物和土壤中磷均表现为净释放,米草、碱蓬和芦苇枯落物磷损失分别占初始总磷含量的42.37%、59.27%和28.48%;枯落物-土壤系统中C、N、P的动态变化与枯落物和土壤性质密切相关,这主要是由微生物的活性和养分需求决定的。更多还原

【Abstract】 To classify the nutrient dynamics of litter-soil system during litter decomposition,a 52-day laboratory experiment was conducted to simulate the litter decomposition process of Spartina alterniflora,Suaeda glauca,and Phragmites australis in coastal wetlands of Jiaozhou Bay.The contents of organic carbon(TOC),nitrogen(N) and phosphorus(P) in litter and soil were measured.The results showed that carbon loss of S.alterniflora,S.glauca,and P.australis litter after 52-day incubation accounted for 24.44%,74.20%,and 49.75% of the initial total C contents,respectively.There was a net C accumulation in the soil.Nitrogen in the S.alterniflora litter had a net accumulation,but an opposite trend was found in the S.glauca litter.In addition,N in the P.australis litter accumulated first and then released.The N loss accounted for 37.93%and 4.81% of the initial litter N content of S.glauca and P.australis,respectively.Nevertheless,N in soil had a net accumulation during incubation.Phosphorus had a net release both in litter and soil.The P release from S.alterniflora,S.glauca,and P.australis litter accounted for42.37%,59.27% and 28.48% of the initial total P content,respectively.The dynamics of C,N,and P in litter-soil system were closely related to litter and soil properties,which were mainly determined by microbial activity and nutrient demand.更多还原