米槠次生林内4种植物叶片DOM的数量和质量特征  

Quantities and Qualities of Leaf-leached DOM of Four Species in A Secondary Castanopsis carlesii Forest

作　　者：康根丽 高人[1,3] 杨玉盛[1,3] 陈光水[1,3] 杨智杰[1,3] 司友涛[1,3] 

机构地区：[1]福建省湿润亚热带山地生态重点实验室省部共建国家重点实验室培育基地,福州350007 [2]福建师范大学地理科学学院,福州350007 [3]福建师范大学地理研究所,福州350007

出　　处：《亚热带资源与环境学报》2014年第1期30-37,共8页Journal of Subtropical Resources and Environment

基　　金：国家自然科学青年基金项目(31100467);国家自然科学基金项目(31070548);福建省自然科学青年基金项目(2011J05105);福建师范大学优秀青年骨干教师培养基金(fjsdky2012008)

摘　　要：选取福建省三明市米槠次生林内的4种植物，即米槠（CAC），木荷（SCS），山杜英（ ELS），芒萁（ DID）为研究对象，对其叶片进行了室内淋溶处理，并分析了淋溶液中的可溶性有机碳（DOC）和可溶性有机氮（DON）含量及pH值，芳香性指标（AI）和荧光效率指数（ Fef ）等，以揭示其淋溶液中可溶性有机质（ DOM）的数量和质量特征。结果表明：4种植物叶片DOM含量总体随淋溶次数的增加逐渐减小，其中首次淋溶后淋溶液中的DOC 和DON含量最大，分别占总淋溶量的平均值为67.90％和44.51％；淋溶液中前3次DOC和DON淋溶量总和分别占10次淋溶总量的87.40％～94.77％和68.46％～72.49％；且前3次淋溶次数间呈极显著差异（ P＜0.01），其后差异性不显著。 DOM的pH值和光谱指标随着淋溶次数的增加逐渐上升．总体上乔木树种DOM的数量和质量比林下植被要高，这是由于乔木树种的DOM含有更多的养分和芳香类和腐殖化的高分子量化合物，而林下植被的DOM含有较多低分子量化合物和易分解组分。times of extraction , 67.90%of total DOC and 44.51%of total DON were obtained by the first extrac-tion, and most of the nutrients （87.40%~94.77% and 68.46%~72.49% for DOC and DON re-spectively ） were obtained by the first three extractions .The DOC and DON concentrations among the first three extractions differed significantly （ P＆lt;0.01 ） , while there was no significant difference among the following extractions .With increasing leaching times , the pH values and the AI increased slightly , and the Fef and Fmax increased markedly , which suggested that the amount of easily degradable materi-als decreased and the proportion of humic substances bearing aromatic rings increased .The concentra-tions of DOC and DON were much higher for the overstory species （ CAC, SCS, ELS） than for under-growth species （ DID） .Our results indicated that DOM derived from the overstory species contained more DOC and DON , with more condensed aromatic and humified compounds , while DOM from the understory vegetation contained more labile compounds .

关 键 词：叶片 乔木树种 林下植被 淋溶次数 可溶性有机质 光谱特征 

分 类 号：S718.55[农业科学—林学]