更新方式对亚热带森林土壤溶液可溶性有机质数量及化学结构的影响  

Effects of forest regeneration patterns on the quantity and chemical structure of soil solution dissolved organic matter in a subtropical forest

作　　者：元晓春 林伟盛[1,2] 蒲晓婷[1,2] 杨智榕[1,2] 郑蔚[1,2] 陈岳民 杨玉盛[1,2] 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福州350007

出　　处：《应用生态学报》2016年第6期1845-1852,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(31130013);高等学校博士学科点专项科研基金(优先发展领域)项目(20113503130001)资助~~

摘　　要：采用负压法对福建省三明市亚热带常绿阔叶林中米槠次生林（BF）、米槠人促更新林（RF）、米槠人工林（CP）0-15、15-30、30-60 cm土层土壤溶液可溶性有机质（DOM）的浓度及光谱学特征进行研究.结果表明：土壤溶液可溶性有机碳（DOC）浓度整体趋势为RF〉CP〉BF,而可溶性有机氮（DON）则为米槠人工林最高;且DOC和DON在表层（0-15 cm）土壤浓度皆显著高于底层（30-60 cm）.芳香化指数大小为RF〉CP〉BF,且整体为表层较高.米槠人工林表层土壤以荧光强度高的短波峰（320 nm）为特征峰,表明其易分解物质含量高,腐殖化程度较低;而米槠人促更新林表层土壤则以宽平的中长波峰（380 nm）为特征峰,说明其腐殖化程度较高,有助于土壤肥力的储存.此外,30-60 cm深层DOM特性几乎不受森林更新方式的影响.Using the negative pressure sampling method,the concentrations and spectral characteristics of dissolved organic matter（ DOM） of soil solution were studied at 0-15,15-30,30-60 cm layers in Castanopsis carlesii forest（ BF）,human-assisted naturally regenerated C. carlesii forest（ RF）,C. carlesii plantation（ CP） in evergreen broad-leaved forests in Sanming City,Fujian Province. The results showed that the overall trend of dissolved organic carbon（ DOC） concentrations in soil solution was RF CP BF,and the concentration of dissolved organic nitrogen（ DON） was highest in C. carlesii plantation. The concentrations of DOC and DON in surface soil（ 0- 15 cm）were all significantly higher than in the subsurface（ 30- 60 cm）. The aromatic index（ AI） was in the order of RFCP BF,and as a whole,the highest AI was observed in the surface soil. Higher fluorescence intensity and a short wave absorption peak（ 320 nm） were observed in C. carlesii plantation,suggesting the surface soil of C. carlesii plantation was rich in decomposed substance content,while the degree of humification was lower. A medium wave absorption peak（ 380 nm） was observed in human-assisted naturally regenerated C. carlesii forest,indicating the degree of humification was higher which would contribute to the storage of soil fertility. In addition,DOM characteristics in 30-60 cm soil solution were almost unaffected by forest regeneration patterns.

关 键 词：森林更新 可溶性有机质 荧光光谱 芳香化指数 腐殖化指数 

分 类 号：S714.2[农业科学—林学]