摘要
红树林湿地生态系统是兼具陆地和海洋生态特征的海岸生态关键区。本研究以广西北仑河口的天然红树林为研究对象,对4种红树植物(木榄、桐花树、秋茄和白骨壤)叶片和2个剖面土壤(0~10 cm和30~40 cm)的C、N、P含量及其计量特征进行了分析。结果表明:(1)4种红树植物叶片C、N、P平均含量分别为492.49 mg/g、13.39 mg/g和1.35 mg/g,其中C含量表现为桐花树>秋茄>木榄>白骨壤,而N、P含量为白骨壤>秋茄>桐花树>木榄,叶片C∶N、C∶P、N∶P值分别为39.04、414.63、10.47,该结果表明北仑河口红树植物具有较高的碳汇能力,其生长更易受N限制;(2)土壤C、N、P平均含量分别为28.65 mg/g、1.04 mg/g和0.22 mg/g,其中N、P含量表现为0~10 cm>30~40 cm,而C含量表现为30~40 cm>0~10 cm。N、P含量和C∶N、C∶P值在两个土壤剖面间存在极显著差异;(3)叶片N、P含量与土壤N、P含量的相关性不显著,而土壤P含量与叶片C含量、C∶P及N∶P值有显著或极显著的负相关关系,土壤N含量与叶片C∶P和N∶P值分别呈现显著正相关和极显著负相关关系,该结果可能与红树植物的生理生态特征以及河口海岸环境(潮汐、微地形等)有密切关系。
The mangrove wetland ecosystem is a coastal ecological key area that combines ecological characteristics of land and marine.This study selected the natural mangrove community in the Guangxi Beilun Estuary Nature Reserve and analyzed contents of C,N and P,and their stoichiometric ratios in leaves of four mangrove plants(Bruguiera gymnorrhiza,Aegiceras corniculatum,Kandelia obovate and Avicennia marina)and samples of two soil profiles(0-10 cm and 30-40 cm).The results showed that:(1)the average contents of C,N and P in leaves of four mangrove plants were 492.49,13.39 and 1.35 mg/g,respectively,and the order of C contents was A.corniculatum>K.obovate>B.gymnorrhiza>A.marina,and the order of N and P contents was A.marina>K.obovate>A.corniculatum>B.gymnorrhiza,ratios of C∶N,C∶P,and N∶P in leaves were 39.04,414.63,and 10.47,respectively,indicating that mangrove plants in the Beilun Estuary,whose growth is restricted by N,have high carbon sinking capacity;(2)average contents of C,N and P in soils were 28.65,1.04 and 0.22 mg/g,respectively,and N and P contents in soils of 0-10 cm were greater than those in soils of 30-40 cm,while C contents in soils showed an opposite trend,contents of N and P and ratios of C∶N and C∶P were different very significant between two soil profiles;(3)correlations of N and P contents in leaves and soils were not significant;significant or very significant negative correlations were found among soil P contents,C contents in leaves and ratios of C∶P and N∶P in leaves,while soil N contents significantly positively correlated with C∶P ratios in leaves and very significantly negatively correlated with N∶P ratios in leaves.These results may be related to physiological and ecological characteristics of mangrove plants and estuarine coastal environment conditions,such as tidal,microtopography and so on.
作者
周元慧
张忠华
黎洁
刘熊
胡刚
ZHOU Yuanhui;ZHANG Zhonghua;LI Jie;LIU Xiong;HU Gang(Key Laboratory of Beibu Gulf Environment Change and Resources Utilization of Ministry of Education,Nanning Normal University,Nanning 530001,China;The Collaborative Innovation Center of the Ecological Environment and Integration Development in the Xijiang River Basin,Nanning Normal University,Nanning 530001,China;School of Geography and Planning,Nanning Normal University,Nanning 530001,China;Sea-Area Use Dynamic Monitoring Center of Fangchenggang City,Guangxi Fangchenggang 538001,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2020年第1期58-65,共8页
Earth and Environment
基金
国家自然科学基金项目(31560136)
北部湾环境演变与资源利用教育部重点实验系统基金项目(2014BGERLXT04、2014BGERLXT05)。
