摘要
为了探讨黄河三角洲盐地碱蓬和芦苇种子萌发阶段在不同盐胁迫条件的竞争关系,以及氮添加对其竞争的影响,本实验采用培养皿纸上发芽床法,分析了不同浓度氮、盐及混合培养等条件下两种种子发芽率、发芽速度的响应。结果表明,盐胁迫对盐地碱蓬和芦苇种子发芽率均有显著性影响,盐浓度低于300 mmol·L^-1时盐地碱蓬发芽率并未有显著降低,而芦苇种子发芽率随着盐浓度增加而呈现显著降低趋势;低盐条件下,氮添加未对两物种发芽率产生显著影响,但高盐胁迫条件下适度的氮添加显著增加了种子发芽率。混合培养显著增加了低盐环境中芦苇的发芽率,当盐胁迫浓度升高时,培养模式对两物种发芽率影响程度降低。对于发芽速度而言,低盐处理下单独培养盐地碱蓬的发芽速度显著高于混合培养,氮添加对盐地碱蓬发芽速度未产生显著影响;而低盐条件(0、100 mmol·L^-1)下芦苇的发芽速度则是在混合培养高于单独培养方式,当盐浓度升高(400 mmol·L^-1)时,混合培养抑制了芦苇的发芽速度,此时,高氮(40 mmol·L^-1)添加处理则能够显著缓解混合培养对芦苇发芽的抑制作用。研究结果可以为黄河三角洲滨海典型物种生态适应机制研究提供一定的理论依据。
To investigate the competitive relationship between Suaeda salsa and Phragmites australis in the Yellow River Delta under different salt stress conditions during the period of the seed germination,the seed germination percentage and germination rate under different concentrations of nitrogen and salt,were measured for the two species germinated alone and mixed.The influence of nitrogen addition on their competitive relationship was also detected.The results showed that salt stress had significant effects on the germination percentage of S.salsa and P.australis.When the salt concentration was lower than 300mmol·L^-1,the germination rate of S.salsa changed insignificantly,but the germination rate of P.australis decreased significantly with the increasing salt concentration.Under the low level of salt concentration,nitrogen addition did not significantly affect the germination percentage of the two species.However,the moderate nitrogen addition(20mmol·L^-1)significantly increased the germination rate under high salt stress.When the seeds of two species mixed,the germination rate of P.australis increased significantly at a low salt level,but the differences of the germination rate between species alone and mixed treatments became less when the concentration of salt increased.Under low salt treatment,the germination rate of S.salsa germinated alone was significantly higher than that of seeds in mixed treatment,and nitrogen addition had no significant effect on the germination rate of S.salsa.Under the low salt condition(0,100mmol·L^-1),the germination rate of P.australis in mixed treatment was higher than that in alone treatment.When the salt concentration increased(400mmol·L^-1),the germination rate of P.australis was inhibited in mixed treatment.And high nitrogen(40mmol·L^-1)could significantly alleviate the inhibitory effect of mixed treatment on P.australis germination.Our results could provide a theoretical basis for the study on the ecological adaptation mechanism of typical coastal species in the Yellow River Delta.
作者
李梅
张琳
路峰
吴梦迪
于君宝
张晓龙
管博
LI Mei;ZHANG Lin;LU Feng;WU Mengdi;YU Junbao;ZHANG Xiaolong;GUAN Bo(Environment and Material Engineering College,Yantai University,Yantai 264005,China;CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Yantai Institute of Coastal Zone Research(YIC),Chinese Academy of Sciences(CAS),Shandong Key Laboratory of Coastal Environmental Processes,YICCAS,Yantai Shandong 264003,China;Management Committee of Shandong Yellow River Delta National Nature Reserve,Dongying 257091,Shandong,China;The Institute for Advanced Study of Coastal Ecology,Ludong University,Yantai Shandong 264025,China)
出处
《生态科学》
CSCD
2020年第4期113-118,共6页
Ecological Science
基金
国家自然科学基金项目(41871091)
国家自然科学基金山东联合基金重点支持项目(U1806218)。
关键词
盐地碱蓬
芦苇
NACL
发芽
发芽速度
Suaeda salsa
Phragmites australis
NaCl
germination
germination rate
