野生杜鹃林土壤低分子量有机酸分布特征  

Distribution Characteristics of Low Molecular Weight Organic Acids in Soil of Wild Rhododendron Forest

作　　者：许塔艳 全文选 李朝婵[1,2] 潘延楠 谢利娟 郝江涛[1] 高永道 Xu Tayan;Quan Wenxuan;Li Chaochan;Pan Yannan;Xie Lijuan;Hao Jiangtao;GaoYongdao(Guizhou Provincial Key Laboratory of Mountainous Environmental Protection,Guizhou Normal University,Guiyang 550001;State Key Laboratory of Environmental Geochemistry Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081;School of Architectural Engineering,Shenzhen Polytechnic,Shenzhen 518055)

机构地区：[1]贵州师范大学贵州省山地环境重点实验室,贵阳550001 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳550081 [3]深圳职业技术学院建筑工程学院,深圳518055

出　　处：《林业科学》2021年第8期24-32,共9页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(31960312,31460136);贵州省科技厅联合基金项目(黔科合LH字[2017]7354号);贵州省高等学校特色重点实验室(黔教合KY字[2021]002)。

摘　　要：【目的】探讨贵州百里杜鹃国家森林公园内不同林分土壤中有机酸的分布特征,以期为野生杜鹃林分土壤管理提供技术参考。【方法】采集常绿混交马缨杜鹃林、常绿混交露珠杜鹃林、常绿混交迷人杜鹃林、常绿阔叶混交林、落叶阔叶混交林的表层土壤,通过高效液相色谱技术(HPLC)测定土壤中的草酸、酒石酸、苹果酸、柠檬酸、乙酸、乳酸、丁二酸、甲酸的含量。【结果】不同林分类型土壤有机酸总量分布情况为:落叶阔叶混交林>常绿混交露珠杜鹃林>常绿混交马缨杜鹃林>常绿阔叶混交林>常绿混交迷人杜鹃林;土壤有机酸的分布差异显著,有机酸含量高低顺序依次为:草酸>酒石酸>柠檬酸>苹果酸>乳酸>乙酸>甲酸>丁二酸,草酸为优势酸,乙酸、甲酸和丁二酸含量较低;土壤有机酸与pH呈负相关,其中酒石酸与pH呈极显著负相关,柠檬酸与pH呈显著负相关;聚类结果显示,落叶阔叶混交林明显区别于其他林分类型,且草酸含量最高。【结论】不同林分类型土壤中有机酸分布受到优势种的影响,百里杜鹃的落叶阔叶混交林中土壤有机酸含量远高于常绿阔叶混交林和常绿混交杜鹃林,森林土壤有机酸分布特征应成为森林林分管理关注的对象。【Objective】This paper aims to explore the distribution characteristics of organic acids in the soil from different stands in Guizhou Baili Rhododendron National Forest Park,in order to provide technical strategies for the soil management of wild rhododendron stand.【Method】The topsoil of R.delavayi evergreen mixed forest,R.irroratum evergreen mixed forest,R.agastum evergreen mixed forest,evergreen broad-leaved mixed forest,and deciduous broad-leaved mixed forest were collected,and the contents of organic acids(oxalic acid,tartaric acid,formic acid,malic acid,lactic acid,acetic acid,citric acid,succinic acid)were determined by high performance liquid chromatography(HPLC).【Result】The distribution of total content of organic acids in different stand types was as follows:deciduous broad-leaved mixed forest>R.irroratum evergreen mixed forest>R.delavayi evergreen mixed forest>evergreen broad-leaved mixed forest>R.agastum evergreen mixed forest;There were significant differences in soil organic acids among different stand types.The order of organic acid contents was oxalic acid>tartaric acid>citric acid>malic acid>lactic acid>acetic acid>formic acid>succinic acid.Oxalic acid is the dominant acid,and the contents of acetic acid,formic acid and succinic acid were relatively low;There was a negative correlation between soil organic acids and pH,among which tartaric acid was highly significantly negatively correlated with pH,and citric acid was significantly negatively correlated with pH;The clustering results showed that the deciduous broad-leaved mixed forest was obviously different from other stand types,and the oxalic acid content was the highest.【Conclusion】The distribution of soil organic acids in different stand types is affected by dominant species.The content of soil organic acid in deciduous broad-leaved mixed forest is much higher than that of evergreen broad-leaved mixed forest and rhododendron evergreen mixed forest in Baili Rhododendron National Forest Park.The distribution characteristics of or

关 键 词：杜鹃 天然林 有机酸 优势种 林分类型 

分 类 号：S714.2[农业科学—林学]