摘要
植物入侵是河口湿地土壤碳(C)、氮(N)、磷(P)循环的主要驱动因素.为了探讨福建闽江河口互花米草入侵短叶茳芏湿地对碳输入和碳排放的影响,对土壤C、N、P含量和储量及CH_(4)和CO_(2)排放进行了测定与分析.结果表明:(1)互花米草入侵短叶茳芏湿地显著增加了0~60 cm土壤C、N含量和0~15 cm土壤P含量(p<0.05).(2)互花米草入侵短叶茳芏湿地后,0~60 cm土壤C、N、P储量分别增加了16%、46%、26%(p<0.05).(3)互花米草入侵短叶茳芏湿地后,0~15 cm和15~30 cm土壤C/N显著降低了33%和24%,15~30 cm土壤C/P降低了31%(p<0.05).(4)互花米草入侵短叶茳芏湿地显著增加了CH_(4)和CO_(2)平均和累积排放(p<0.05).(5)土壤C、N、P与土壤CO_(2)和CH_(4)排放呈显著正相关(p<0.05,p<0.01),微生物生物量碳(MBC)与土壤CH_(4)排放呈显著正相关(p<0.01),土壤C/N与土壤CH_(4)排放呈显著负相关(p<0.05).综合来看,互花米草入侵闽江河口短叶茳芏湿地增强了土壤C、N、P的固持和CH_(4)、CO_(2)的排放,并受到生态化学计量比的调节.本研究拓展了对植物入侵情形下河口湿地生物地球化学循环的认知.
Plant invasion is taken as the important driving factor of soil carbon(C),nitrogen(N)and phosphorus(P)cycle in estuarine wetland.In order to explore the impact of Spartina alterniflora invasion on the Cyperus malaccensis wetland on carbon input and emission in the Minjiang River estuarine wetland of Fujian Province,the contents and storages of soil C,N and P,methane(CH_(4))and carbon dioxide(CO_(2))emissions were measured and analyzed.The results showed that:(1)Spartina alterniflora invasion Cyperus malaccensis wetland increased the contents of soil C,N at 0~60 cm and soil P at 0~15 cm(p<0.05);(2)The C,N and P storages of soil at 0~60 cm increased by 16%,46%and 26% after Spartina alterniflora invasion Cyperus malaccensis wetland(p<0.05);(3)Soil C/N at 0~15 cm and 15~30 cm decreased by 33% and 24%,and soil C/P at 15~30 cm decreased by 31%after Spartina alterniflora invaded Cyperus malaccensis wetland(p<0.05).(4)Spartina alterniflora invasion Cyperus malaccensis wetland increased the average and cumulative emissions of CH_(4) and CO_(2)(p<0.05).(5)Soil C,N and P were positively correlated with CO_(2) and CH_(4) emissions(p<0.05,p<0.01),microbial biomass carbon(MBC)was positively correlated with CH_(4) emissions(p<0.01),and C/N was negatively correlated with CH_(4) emissions(p<0.05).As a result,Spartina alterniflora invasion enhanced soil C,N,P sequestration and CH_(4) and CO_(2) emissions,which was regulated by ecological stoichiometry.The findings of this study can expand the understanding of biogeochemical cycles in estuarine wetlands under plant invasion scenarios.
作者
黑杰
胥佳忆
王亚非
刘旭阳
尹晓雷
王纯
王维奇
HEI Jie;XU Jiayi;WANG Yafei;LIU Xuyang;YIN Xiaolei;WANG Chun;WANG Weiqi(Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education,Fujian Normal University,Fuzhou 350007;Institute of Geographical Science,Fujian Normal University,Fuzhou 350007)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第11期416-426,共11页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.42141014,41901111)
福建省自然科学基金(No.2020J01188)。
关键词
碳、氮、磷
甲烷
二氧化碳
植物入侵
闽江河口湿地
carbon
nitrogen and phosphorus
methane
carbon dioxide
plant invasion
Minjiang River estuarine wetland
