互花米草入侵下湿地土壤碳氮磷变化及化学计量学特征

发布时间：2018-04-11 17:18

本文选题：短叶茳芏 + 营养元素　；参考：《应用生态学报》2017年05期

【摘要】：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.
[Abstract]:In order to elucidate the change of ecosystem caused by alien species invasion, the contents of TCN, TNN and TPN in the soil of Spartina alterniflora wetland with different invasion years were determined and analyzed in Minjiang River estuary.The results showed that the contents of TCN and TP in soil at 0 ~ (50 cm) depth after Spartina alterniflora invasion increased to some extent, among which the change of TCN was consistent, while the increase of TP delayed the increase of TC, which caused the continuous increase of soil C / N.TP is the key factor to regulate soil C / P and N / P in wetland soil during the invasion of Spartina alterniflora. The changes of C / P and N / P are basically consistent.The effects of particle size composition of C / N and C / P on soil carbon sequestration in Spartina alterniflora wetland were well indicated.The invasion of Spartina alterniflora caused significant changes in biomass and wetland habitat, which led to significant changes in soil carbon, nitrogen and phosphorus contents and their ecological stoichiometric ratios, and showed different characteristics with the extension of invasion time.
【作者单位】：福建师范大学地理科学学院/湿润亚热带生态地理过程教育部重点实验室/亚热带湿地研究中心;安庆师范大学资源环境学院;
【基金】：国家自然科学基金项目(31000262) 国家基础科学人才培养基金项目(J1210067) 福建师范大学校创新团队项目(IRTL1205)资助~~
【分类号】：S153.6

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