福建万木林12种优势植物叶热值与养分特征  

Caloric Value and Nutrient Characteristic in Leaves of 12 Dominant Species in Wanmulin Nature Reserve,Fujian Province,China

作　　者：林恬[1,2] 黄儒珠[1] 郑怀舟[3,2] 王健[3,2] 钟圣[1,2] 

机构地区：[1]福建师范大学生命科学学院,福州350108 [2]湿润亚热带生态-地理过程省部共建教育部重点实验室,福州350007 [3]福建师范大学地理科学学院,福州350108

出　　处：《亚热带资源与环境学报》2010年第1期34-41,共8页Journal of Subtropical Resources and Environment

基　　金：福建省自然科学基金资助项目(2008J0271)

摘　　要：本研究分析了福建万木林自然保护区中亚热带常绿阔叶林12种优势植物叶热值、灰分含量和C、N含量及其之间的相关性.结果表明:1)12种优势植物叶平均干重热值为乔木(20.95 kJ.g-1)>灌木(20.50 kJ.g-1)>草本(17.49 kJ.g-1),去灰分热值为灌木(21.78 kJ.g-1)>乔木(21.73 kJ.g-1)>草本(18.62 kJ.g-1),灰分含量为草本(5.94%)>灌木(5.82%)>乔木(3.57%);2)12种优势植物叶平均C含量为48.63%,N含量为1.92%.相关分析表明,12种优势植物叶干重热值和去灰分热值与C含量呈极显著正相关(P<0.01),与N含量及C/N相关不显著;3)2个不同样地植物叶热值和C/N存在差异,其中样地I(米槠群落)为演替的顶级群落,植物叶去灰分热值与C/N呈极显著负相关(P<0.01),样地II(浙江桂群落)处于演替中期阶段,与C/N无显著相关性,但同种植物对光能的捕获特性在不同样地中并未发生显著变化.Caloric value, ash content, and nutrient content in leaves of 12 dominant species in midsubtropical evergreen broad-leaved forest in Fujian Wanmulin Nature Reserve were investigated. Theresults indicated that： 1 ） Rank order of the average gross caloric value in the leaves was tree layer （20. 95 kJ·g^-1） 〉 shrub layer （20. 50 kJ·g^-1） 〉 herbaceous layer （17.49 kJ·g^-1） . Meanash free caloric value decreased from the shrub layer （21.78 kJ ·g^-1 ）, to the tree layer （21.73 kJ ·g^-1）, and to the herbaceous layer （18.62 kJ·g^-1） . The average ash content decreased in thefollowing order： herbaceous layer （5.94%）, shrub layer （5.82%） and tree layer （3. 57% ） . 2） Mean carbon and nitrogen content in the leaves were 48.63 % and 1.92 %, respectively. Both grosscaloric value and ash free caloric value were found to be significantly positive correlated with carbon content （P 〈0. 01 ）, and not to be significantly with nitrogen content and the ratio C to N. 3） Differ-ences in caloric value and the ratio C to N were observed between 2 different sampled plots. The plot Ⅰ （Castanopsis carlesii community） considered to be a climax community. Ash free caloric value wasfound to be significantly negative correlated with the ratio C to N （P 〈0. 01 ） in the plot Ⅰ, and to bepoor correlated in the plot Ⅱ（ Cinnamomum chekiangense community） which was in the middle stage of succession. However, the light energy capture efficiency for the same species between the 2 plots wasnot significantly different.

关 键 词：热值 养分 优势植物 福建万木林自然保护区 

分 类 号：S718.554.1[农业科学—林学]