不同淹水频率下湿地土壤碳氮磷生态化学计量学特征

Ecological Stoichiometry Characteristics of Wetland Soil Carbon,Nitrogen and Phosphorus in Different Water-Flooded Frequency

为了阐明湿地土壤生态化学计量学特征对淹水频率差异的响应,对闽江河口湿地近潮沟区域不同淹水频率的藨草湿地、短叶茳芏湿地和芦苇湿地以及远潮沟区域的短叶茳芏湿地和芦苇湿地土壤的碳、氮、磷生态化学计量学特征进行了测定与分析。研究结果表明:(1)闽江河口湿地土壤C/N、C/P和N/P比分别为11.46～22.28,25.29～155.62和2.21～8.25,平均值为15.58,73.71和4.67;(2)近潮沟区域土壤C/N、C/P和N/P比均表现出随着淹水频率的增加而减小,但远近潮沟区域的同种植物类型湿地间则表现为随着淹水频率的增加而增大;(3)总体来看,土壤C/N比表现出随着淹水频率和土壤剖面的变化较小,C/P和N/P比的变异性相对较大;(4)盐度是影响闽江河口不同淹水频率下湿地土壤C/N、C/P和N/P比变化的最重要的因子。

To clarify the responses of soil ecological stoichiometry in wetland to water-flooded frequency,the ecological stoichiometry characteristics of carbon,nitrogen and phosphorus elements of soil in Scirpus triqueter,Cyperus malaccensis,Phragmites australis wetland in near tidal ditch area and Cyperus malaccensis,Phragmites australis wetland far from tidal ditch area were analyzed.The results showed： C/N,C/P,N/P ratios were 11.46～22.28,25.29～155.62,2.21～8.25 and averaged values of C/N,C/P,N/P ratios were 15.58,73.71,4.67.Averaged values of C/N,C/P,N/P ratios were decline as the water-flooded frequency increment of near tidal ditch area,but reverse for the same plant wetland between near and far tidal ditch areas.On the whole,soil C/N ratios showed relatively small variation between different water-flooded frequency and soil depth,while C/P and N/P ratios showed a high heterogeneity.Salinity was the most important factor influencing soil C/N,C/P,N/P ratios of different water-flooded frequency in Minjiang River estuary.