福州酸雨区次生林中台湾相思与银合欢叶片的12种元素含量  

Characteristics of leaf element concentrations of twelve nutrients in Acacia confusa and Leucaena glauca in secondary forests of acid rain region in Fuzhou

作　　者：郝兴华[1,2] 洪伟[1,3] 吴承祯[1,3] 李键[1,3] 王幼茹[1] 杨晓伟[1] 

机构地区：[1]福建农林大学福建省高校森林生态系统过程与经营重点实验室,福州350002 [2]河北省地矿局水文工程地质勘查院,石家庄050021 [3]福建农林大学林学院,福州350002

出　　处：《生态学报》2012年第22期6964-6971,共8页Acta Ecologica Sinica

基　　金：教育部博士学科专项基金(200803890010);福建省科技厅资助项目(2009N0005)

摘　　要：在酸雨区,研究叶片元素浓度变化规律对于理解树种选择与重建亚热带森林具有重要意义。在中亚热带丘陵次生林的酸雨区内,测定两个优势树种——台湾相思树(Acacia confusa)、银合欢(Leucaena glauca)的叶片元素(N、P、S、K、Ca、Na、Mg、Fe、Mn、Cu、Zn和Al)含量,并探讨其可能遭受酸雨的影响。结果表明,两树种叶片营养元素含量均表现为N>K>Ca>S>P>Mg>Na,重金属元素表现为Fe>Al>Cu。两树种叶片的P、Ca、Mg、Na、Mn和Cu含量差异极显著,Zn含量差异显著。受频繁酸雨影响,台湾相思(3.42 g/kg)和银合欢(2.70 g/kg)的S含量明显高于中国陆生被子植物叶片的平均值((1.66±3.06)g/kg),Na含量低于S含量,也明显低于中国陆生被子植物叶片Na含量的平均值((2.48±5.45)g/kg),表明研究区域植物叶片的Na元素的特异性,酸雨加速土壤酸化导致土壤Na含量低可能是一个原因。由N/P、Ca/Al摩尔比值的大小可得出,台湾相思为P制约型树种,虽然其Al含量并未超出正常范围值,但其Ca/Al摩尔比值小于12.5,表明存在Al的危害风险;而银合欢属N制约型树种,并未受到Al的危害,更适应研究区生长环境。若仅从叶片元素含量分析,该区域的台湾相思和银合欢受到Fe危害风险,且存在更大的Cu和Zn危害风险,银合欢的Zn、Cu元素累积量大于台湾相思,所以可以认为银合欢的抗性强于台湾相思,可能更适应于酸雨区域生长。Acid rain is one of serious environmental problems in many cities due to the industrial pollution.In acid rain regions,it is important to understand the pattern of changes in element concentrations in leaves for selection of tree species planted and re-establishing mid-subtropical forests.In hilly secondary forests of acid rain regions,Acacia confuse and Leucaena glauca are the two dominant tree species in mid-subtropical zone.This study determined twelve element concentrations（N,P,S,K,Ca,Na,Mg,Fe,Mn,Cu,Zn and Al） in the leaves of the two species,and analyzed the potential harm of some toxic metal elements caused by the acid rain.The results showed that element concentrations were as following N K Ca S P Mg Na,and Fe Al Cu in leaves of the two species.Significant differences were found in the leaf element concentrations such as P,Ca,Mg,Na,Mn,Cu and Zn between the two species.Due to the frequent acid rains,mean leaf S concentrations of Acacia confuse（3.42 g/kg） and Leucaena glauca（2.70 g/kg） in our study region were higher than the average level of that of terrestrial angiosperm in China（（1.66±3.06） g/kg）.However,leaf Na concentrations（（0.63±0.25） g/kg） were lower than leaf S concentrations for both of Acacia confuse and Leucaena glauca,respectively,and also lower than the average level of that of terrestrial angiosperm in China（（2.48±5.45）g/kg）.The characteristics of leaf Na concentration in study region could probably resulted from the soil acidification by acid rain which lowered soil Na content.On the one hand,according to the mol ratios of N/P and Ca/Al in leaves,Acacia confuse was one of the P-constrained species.Although leaf Al concentration of Acacia confuse was within the normal range,the mol ratio of Ca/Al in leaves was less than 12.5,which indicated that change in leaf Al concentration was potentially as a result of the harm caused by acid rain.On the other hand,Leucaena glauca was one of the N-constrained species and free of Al harm,suggesting that Leucaena glauc

关 键 词：酸雨区 台湾相思 银合欢 叶片元素含量 

分 类 号：S792.99[农业科学—林木遗传育种]