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互花米草入侵下湿地土壤碳氮磷变化及化学计量学特征 被引量:8

Changes of soil carbon, nitrogen and phosphorus and stoichiometry characteristics in marsh invaded by Spartina alterniflora.
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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. To clarify the effect of invasive alien plants on ecosystem functions, soil total carbon (TC), total carbon (TN), and total phosphorus (TP) contents were studied in the exotic invasive plant Spartina alterniflora marsh with different durations and the native species Cyperus malaccensis marsh in the Minjiang River estuary. The results showed that there were different variations of TC, TN and TP at 0-50 cm soil layer in the C. malaccensis marsh invaded by S. alterniflora, but ihe changes of TC and TN were similar and the change of the TP lagged behind them. Soil C/N increased continually with the increase of TC. Soil TP was a during the S. alterniflo changes of TC, TN an soil water content and ra invasion, and the change of C/P key factor affecting soil C/P and N/P and N/P followed a similar trend. The d TP were influenced by abiotic factors such as soil salinity, bulk density, clay composition. C, N and P stoichiometric ratios were influenced mainly by soil salinity and grain composition. C/N and C/P were the good indicators for soil carbon enrich- ment ability in S. alterniflora marsh. S. alterniflora invasion induced the change of biomass and marsh habitats. Soil carbon, nitrogen, phosphorus contents, and their ecological stoichiometric ratios changed significantly in the C. malaccensis marsh invaded by S. alterniflora and showed diffe- rent change characteristics with different invasion duration.
作者 金宝石 闫鸿远 王维奇 曾从盛 JIN Bao-shi1,2, YAN Hong-yuan2, WANG Wei-qi1, ZENG Cong-sheng1 ( 1 School of Geographical Sciences/Ministry of Education Key Laboratory of Humid Sub-tropical Eco-geographical Process/Research Centre of Wetlands in Subtropical Region, Fujian Normal University, Fuzhou 350007, China; 2School of Resources and Environment Science, Anqing Normal University, Anqing 246133, Anhui, China)
出处 《应用生态学报》 CSCD 北大核心 2017年第5期1541-1549,共9页 Chinese Journal of Applied Ecology
基金 本文由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)和福建师范大学校创新团队项目(IRTL1205)资助.
关键词 短叶茳芏 营养元素 生态化学计量学 入侵年限 Cyperus malaccensis nutrient element ecological stoichiometry invasion duration.
作者简介 金宝石,男,1979年生,副教授,博士研究生.主要从事湿地生态环境研究.E—mail:jinbsh@aqnu.edu.cn 通讯作者Correspondingauthor.E-mail:cszeng@finn.edu.cn
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