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为阐明外来物种入侵对生态系统的改变,对闽江河口区本土植物短叶茳芏和不同入侵年限的互花米草湿地土壤总碳(TC)、总氮(TN)、总磷(TP)含量进行了测定与分析.结果表明:互花米草入侵后0~50 cm深度各层土壤TC、TN和TP含量均有不同程度的增加,其中TC、TN的变化比较一致,而TP的变化滞后;TC的增加引起土壤C/N持续增加,而TP是调节互花米草入侵过程中湿地土壤C/P和N/P的关键因子,C/P和N/P的变化基本一致.土壤TC、TN、TP的变化受到土壤盐度、容重、含水量和黏粒组成的影响,而它们之间计量比主要受土壤盐度、粒径组成的影响;C/N和C/P对互花米草湿地的土壤固碳效应具有良好的指示作用.互花米草入侵引起生物量和湿地生境改变,导致土壤碳氮磷含量及其生态化学计量比发生显著变化,且随入侵时间延长表现出不同的变化特征.
In order to clarify the alien species invasion to the ecosystem, the soil total carbon (TC), total nitrogen (TN) and total phosphorus (TP) in the Spartina alterniflora wetland of Minjiang estuary, The results showed that the contents of TC, TN and TP increased at different depths in all depths of 0-50 cm soil layer after Spartina alterniflora invasion, of which the changes of TC and TN were consistent, while the changes of TP Hysteresis.C / P increased with the increase of TC, while TP was the key factor regulating the C / P and N / P of wetland soil during Spartina alterniflora invasion.The changes of C / P and N / P were basically the same.The soil The changes of TC, TN and TP were affected by soil salinity, bulk density, water content and clay composition, but the ratio between them was mainly affected by soil salinity and particle size composition. C / N and C / Carbon sequestration in soils with Spartina alterniflora is a good indicator of soil carbon sequestration. Spartina alterniflora invasion caused changes in biomass and wetland habitat, leading to significant changes in soil C, N and P content and their stoichiometry, Different characteristics of change.