不同质地湿地土壤碳、氮、磷计量学及厌氧碳分解特征

为了解不同质地湿地土壤碳、氮、磷计量学及厌氧碳分解特征,对闽江河口芦苇和藨草湿地2种质地土壤(壤质土和砂土)的碳、氮、磷计量学及土壤厌氧碳分解特征进行测定与分析.结果表明:壤质土碳为14.61mg/g,氮为1.01mg/g,磷为0.64mg/g,高于砂土碳(9.02mg/g),氮(0.16mg/g)和磷(0.42mg/g).0～40cm壤质土C/N均值低于砂土,C/P、N/P高于砂土.0～40cm壤质土和砂土平均甲烷产生潜力分别为0.0072,0.0019μg/(g·d),CO2产生潜力分别为33.5134,4.9239μg/(g·d),CO2和CH4产生潜力均为壤质土高于砂土.土壤碳、氮、磷的计量学特征对厌氧碳分解具有一定的指示作用.

Stoichiometry characteristics of carbon, nitrogen, phosphorus and anaerobic carbon decomposition of wetland soil of different texture

To clarify the stoichiometry characteristics of carbon, nitrogen, phosphorus and anaerobic carbon decomposition of wetland soil of different texture, the stoichiometry characteristics of carbon, nitrogen, phosphorus and anaerobic carbon decomposition of soil of two texture (loam and sandy soil) under Phragmites australis and Scirpus triqueter stands in Minjiang River estuary were analyzed. Loam carbon content was 14.61 mg/g, nitrogen was 1.01 mg/g and phosphorus was 0.64 mg/g,which were higer than that of sandy soil carbon(9.02 mg/g), nitrogen (0.16 mg/g) and phosphorus(0.42 mg/g).Averaged C/N ratios of loam was lower than sandy soil and C/P, N/P ratios were higer than sandy soil.The averaged methane production potential of 0~40 cm loam and sandy soil were 0.0072, 0.0019μg/(g·d) and carbon dioxide were 33.5134, 4.9239μg/(g·d), respectively.The potentials of two kinds of carbon decomposition production from loam were all higher than that of sandy soil. The stoichiometry characteristics of carbon, nitrogen, phosphorus had a preferable indication for anaerobic carbon decomposition.