贵州普定喀斯特森林3种优势树种叶片元素含量特征  

Characteristics of Element Contents in Leaves of 3 Dominant Species in Karst Forest in Puding, Guizhou, China

作　　者：旷远文[1] 温达志[1] 闫俊华[1] 刘世忠[1] 褚国伟[1] 周传艳 王国勤[3] 张倩媚[1] 

机构地区：[1]中国科学院华南植物园,广州510650 [2]贵州省喀斯特资源环境与发展研究中心,贵阳550001 [3]中国科学院地理科学与资源研究所,北京100101

出　　处：《应用与环境生物学报》2010年第2期158-163,共6页Chinese Journal of Applied and Environmental Biology

基　　金：中国科学院青年人才领域前沿项目(No.200719);广东省自然科学基金项目(No.8451065005001317);贵州省社会发展公关项目(黔科合S字[2007]1023)资助~~

摘　　要：为探讨喀斯特森林优势树种叶片营养特征及环境变化对其可能带来的重金属胁迫,测定了贵州普定山区喀斯特森林3个优势乔木树种——大叶栎(Quercus griffithii)、猴樟(Cinnamomum bodinieri)和刺楸(Kalopanax septemlobus)的叶片元素(N、P、K、Ca、Mg、Mn、Cu、Zn、Cr、Ni、Pb和Al)含量,并分析了N、P、Ca、K、Mg和Al含量比值。结果表明,3种优势乔木叶片营养元素含量特征均表现为Ca>K>Mg>N>P>Mn型,重金属元素含量特征均为Al>Zn>Cu>Ni>Pb>Cr型;Ca和K是喀斯特森林乔木最主要的营养元素,根据叶片Ca+Mg含量,3种优势乔木均属于随遇型喀斯特植物;3个优势树种叶片的重金属含量均处于正常范围,但大叶栎叶片Cu、Zn、Ni和Pb含量已接近其在植物正常范围的上限;对叶片元素含量比值的分析表明,喀斯特山区森林优势树种都属于N制约性植物,其叶片还未受到Al毒的潜在危害.In order to assess the nutrient characteristics of the dominant species in karst forest and the environmental changes- induced metal stress on the forest health, the contents of nutrient elements （N, P, Ca, K, Mg, Mn, Cu, Zn, Cr, Ni, Pb, Al） and ratios of N/P, K/Ca, K/Mg and Ca/Al in the leaves of 3 species （Quercus griffithii, Cinnamomum bodinieri and Kalopanax septemlobus） in karst forest in Puding, Guizhou, China were determined and analyzed. The patterns of the nutrient contents in the leaves of the 3 species were all revealed as Ca〉K〉Mg〉N〉P〉Mn, while those of the metals as Al〉Zn〉Cu〉Ni〉Pb〉Cr. Calcium and potassium were determined the most dominant nutrients in the leaves of the karst forest trees. According to the contents of Ca＋Mg in their leaves, the 3 species could be all classifi ed as indifferent karst plants. The Cu, Zn, Ni and Pb in Quercus griffithii leaves was found close to the higher limit of their normal levels in plants, suggesting that there was a potential risk of heavy metals on the karst forest. The 3 dominant species were all defined as N limited plants, and potential Al toxicity in their leaves were not yet confi rmed based on the ratios of the elements in the leaves. Fig 3, Tab 1, Ref 43

关 键 词：喀斯特森林 叶片元素含量 大叶栎 猴樟 刺楸 

分 类 号：S718.4[农业科学—林学]