白骨壤(Avicennia marina)根系锰含量的积累和影响因素  

Accumulation and Influencing Factors of Mn Content in the Roots of Avicennia marina

作　　者：薛云红 刘文爱[1,2] 方超 XUE Yunhong;LIU Wen′ai;FANG Chao(Guangxi Key Laboratory of Mangrove Conservation and Utilization,Guangxi Academy of Marine Sciences(Guangxi Mangrove Research Center),Guangxi Academy of Sciences,Beihai,Guangxi,536000,China;Observation and Research Station of Coastal Wetland Ecosystem in Beibu Gulf,Ministry of Natural Resources,Beihai,Guangxi,536015,China)

机构地区：[1]广西科学院,广西海洋科学院(广西红树林研究中心),广西红树林保护与利用重点实验室,广西北海536000 [2]自然资源部北部湾滨海湿地生态系统野外科学观测研究站,广西北海536015

出　　处：《广西科学院学报》2024年第3期258-266,共9页Journal of Guangxi Academy of Sciences

基　　金：国家自然科学基金项目(32060282,U21A2022);自治区直属公益性科研院所基本科研业务费项目(GMRC-202403)资助。

摘　　要：锰是一种植物必需元素,但过量会导致植株死亡。本研究在部分白骨壤Avicennia marina疑似出现锰毒症状的广西北海红树林湿地保护区内设立9个样方,测定样方内白骨壤根系生理生化指标和土壤理化因子;通过方差分析、Pearson相关分析和逐步回归分析等方法分析各因子对白骨壤根系锰含量和土壤Mn^(2+)含量的影响,从而探究白骨壤生长衰弱的原因。结果显示,根系锰含量和土壤Mn^(2+)含量与多种根系生理生化指标、土壤理化因子都有显著相关性。多元逐步回归分析表明:对根系锰含量影响显著的是根系活力、须根鲜重、土壤电导率、土壤含水量,以及须根鲜重、土壤电导率分别与土壤含水量的交互项;对土壤Mn^(2+)含量影响显著的是枯枝率、土壤砂、粉砂、潮位,以及土壤砂和潮位的交互项。研究地根系锰含量为74.60-256.05 mg/kg,远低于深圳生长良好的白骨壤根系锰含量(700 mg/kg),因此该地白骨壤生长衰弱不是由锰过量直接导致的,白骨壤枯梢原因需要进一步研究。Manganese is an essential element for plants,but excessive Mn can lead to plant death.In this study,nine sample plots were set up in the Guangxi Beihai mangrove wetland reserve,where Avicennia marina was suspected to have Mn poisoning symptoms.The physiological and biochemical indexes of A.marina root system and soil physical and chemical factors were determined.The effects of various factors on the root Mn content and soil Mn^(2+)content of A.marina were analyzed by variance analysis,Pearson correlation analysis and stepwise regression analysis,so as to explore the reasons for the growth weakness of A.marina.The results showed that root Mn content and soil Mn^(2+)content was significantly correlated with various root physiological and biochemical indexes and soil physicochemical factors.Multiple stepwise regression analysis showed that root activity,fibrous root fresh weight,soil electrical conductivity,soil water content,and the interaction between fibrous root fresh weight,soil electrical conductivity and soil water content had significant effects on root Mn content.The significant effects on soil Mn^(2+)content was withered branch rate,soil sand,silt,tidal level,and the interaction term of soil sand and tidal level.The Mn content of the root system in the study area was 74.60-256.05 mg/kg,which was much lower than that of the well growing A.marina root system in Shenzhen(700 mg/kg).Therefore,the growth and decline of A.marina in this area was not directly caused by excessive Mn.The cause of A.marina withering needs further study.

关 键 词：白骨壤 锰积累 影响因素 根系 红树林 

分 类 号：X173[环境科学与工程—环境科学]