首页 | 本刊简介 | 编委会 | 投稿征稿 | 期刊订阅 | 下载中心 | English
 
   
  论文快速检索

请输入关键词

 

 

   
  信息公告
海外撷英栏目开通,欢迎投稿

热带亚热带植物学报网络开通

访问总次数
14397433
今日访问
601
当前在线
0人
 
引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 2111次   下载 1239 本文二维码信息
码上扫一扫!
分享到: 微信 更多
森林凋落物淋溶中的溶解有机物与紫外-可见光谱特征
杨玉盛, 林瑞余, 李庭波, 董彬, 王小国, 郭剑芬
作者单位
杨玉盛, 林瑞余, 李庭波, 董彬, 王小国, 郭剑芬  
摘要:  对格氏栲(Castanopsiskawakamii)和杉木(Cunninghamialanceolata)人工林新近凋落物、半分解层(F层)和分解层(H层)凋落物进行室内模拟淋洗实验,研究了凋落物淋溶过程中溶解有机碳(DOC)浓度变化及紫外-可见(UV-Vis.)光谱特征。结果表明,格氏栲和杉木人工林新近凋落物淋出液的DOC浓度较低,F层淋出液的DOC浓度较高;格氏栲凋落物淋出液的DOC浓度基本上随淋溶次数的增加而降低,杉木的则先升后降。淋出液中溶解有机物(DOM)的紫外吸收值均随波长的增加而减小,且UV-Vis.吸收曲线均在200 nm附近出现吸收峰,不同来源DOM的E240/E420存在显著差异;同一样品各次淋出液的DOC浓度与E200有很好的线性关系(R2>0.90),据此,可用E200值估算DOC浓度。
关键词:  凋落物  溶解有机物  溶解有机碳  紫外可见光谱
DOI:10.3969/j.issn.1005-3395.2004.2.004
分类号:
基金项目:
Ultraviolet-visible Spectroscopic Characteristics of Dissolved Organic Matter Released from Forest Litterfall
YANG Yu-sheng, LIN Rui-yu, LI Ting-bo, DONG Bin, WANG Xiao-guo, GUO Jian-fen
Abstract:  Laboratory leaching experiment and UV-visible spectra determination were carried out for leachates from fresh litter fall and litters in F (fragmented) and H (Humus) layers in 35-year-old plantations of Castanopsis kawakamii and China fir (Cunninghamia lanceolata) in Fujian Province. The results showed that the concentration of dissolved organic carbon (DOC) in leachate from fresh litter fall was lower and that from F layer was higher for both plantations. In Castanopsis plantation, DOC concentration declined with the increasing number of leaching times, whereas that in China fir plantation increased at first then decreased. UV-visible spectra absorption values of leachates from litter fall and different litter layers decreased with the increase of wavelength, and a peak at about 200 nm was observed in all cases. E240/E420 ratio of dissolved organic matter from different sources was quite different. The concentration of DOC in leachates from the same sample was linearly correlated with E200 (R2>0.90), suggesting that DOC concentration could be estimated at E200.
Key words:  Litterfall  Dissolved organic matter  Dissolved organic carbon  Ultraviolet-visible absorption spectra

Copyright 2007 版权所有 中国科学院华南植物园《热带亚热带植物学报》编辑部
地址: 广州市天河区兴科路723号 中国科学院华南植物园 《热带亚热带植物学报》编辑部 邮编:510650 电话: 86 (0)20-3725 2514  传真:86 (0)20-3725 2642 E-mail: jtsb@scib.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09084417号-2