滦河口典型盐生植物的生态化学计量特征研究

Stoichiometry Characteristics of Typical Halophytes in Luanhe Estuary Wetland

滨海不同湿地植物碳氮磷化学计量特征的系统研究,能够为湿地植物组成分析及植被恢复方法制定提供数据支撑。选取滦河口滨海湿地的典型盐生植物獐毛、盐地碱蓬、芦苇和柽柳为研究对象,分析不同植物及不同营养器官中C、N、P的生态化学计量特征。研究结果表明:4种植物的碳、氮、磷含量存在明显的种间差异(P <0. 05),碳、氮、磷含量均值变化范围为212. 40～291. 38、9. 68～14. 43、0. 86～1. 6 g·kg^(-1),显示植物对养分利用的策略存在差异性。不同营养器官碳含量均为叶>根>茎,表明研究区植物净光合强度低,增长速度慢,具有较强的防御能力。獐毛、芦苇、柽柳的C∶N值和C∶P值均略低于全球平均水平22. 5和232,研究区域整体上植物营养元素利用效率较低。4种盐生植物N与P之间显著正相关(P <0. 01),獐毛、盐地碱蓬、柽柳生长主要受到N的限制、芦苇的生长受P的限制。叶N、与叶P、根N、根C、根P之间显著正相关(P <0. 01),叶P与根N、根P呈正相关(P <0. 01),表明了植物营养器官根系和叶片在适应河口湿地盐碱环境具有较强的协调统一性,是盐生植物进行正常生长活动的有利保障。

Studying the stoichiometry of halophytes will be beneficial to restoration of the vegetation in the coastal wetlands.The research object were four typical halophytes in the luanhekou.The stoichiometric characteristics of C,N and P in different plants and different vegetative organs were analyzed.Results show that:Mean change range of carbon,nitrogen and phosphorus contents(212.40^-291.38,9.68^-14.43 and 0.86^-1.6 g·kg^-1)were significant(P<0.05),possibly indicating different nutrient utilization strategies.The order of C content of different vegetative organs was leaf>root>stem,indicating low photosynthetic rate and strong defense ability.C∶N and C∶P of Aeluropus sinensis,Phragmites communis and Tamarix chinensis Lour were slightly lower than the global average of 22.5 and 232.There was a significant positive correlation between N and P(P<0.01).N is major restrictive factor for plants in the research area.There was a significant positive correlation between leaf N and leaf P,root N,root C,root P(P<0.01);leaf P and root N,root P differed significantly(P<0.01).There was a strong coordination between the root and the leaves of the vegetative organs to adapt to the salinization of the estuarine wetland.