亚热带地区7种典型林分土壤有机氮组分特征  

Soil Organic Nitrogen Components in Seven Typical Forest Stands in Subtropical China

作　　者：耿必苗 孙庆业[1] 武林辉 王艳杰 陈月[1] 赵琼[1] Geng Bimiao;Sun Qingye;Wu Linhui;Wang Yanjie;Chen Yue;Zhao Qiong(Anhui University,Hefei 230601,P.R.China)

机构地区：[1]安徽大学,合肥230601

出　　处：《东北林业大学学报》2023年第3期117-123,共7页Journal of Northeast Forestry University

基　　金：宣城市林业局委托项目(K160139313)。

摘　　要：为了解亚热带地区不同类型林分土壤中总氮与有机氮组分质量分数特征,以阔叶混交林、毛竹林、枫香林、针阔混交林、马尾松林、杉木林、针叶混交林7种类型的林分土壤为研究对象,利用Bremner酸解法对土壤氮组分进行测定,并分析其与土壤理化性质间的相关性。结果表明:林分类型对总氮和有机氮各组分质量分数有显著影响。非酸解氮和酸解氨态氮质量分数表现为毛竹林最高,其余有机氮组分和总氮质量分数均表现为阔叶混交林最高。随着土壤深度增加,土壤总氮、非酸解氮、酸解氮及其各组分质量分数均呈下降趋势。土壤酸解氮是总氮的主体,占比为68.06%。有机氮各组分质量分数及其占总氮比例由大到小依次为:非酸解氮及未知态氮、氨基酸态氮及酸解氨态氮、氨基糖态氮。This study was conducted to understand characteristics of total nitrogen(N) and organic N components in different types of forest soils in subtropical China. Soil total N and organic N components determined by Bremner acid hydrolysis method were compared in seven types of forests, i.e. mixed broad-leaved forest, Phyllostachys edulis forest, Liquidambar formosana forest, mixed coniferous and broad-leaved forest, Pinus massoniana forest, Cunninghamia lanceolata forest and mixed coniferous forest. In addition, the correlations between soil N components and physicochemical properties were analyzed. The forest type has a significant effect on the contents of total N and organic N components. The contents of non-acid hydrolysis N and acid hydrolysis ammonia N are highest in Phyllostachys edulis forest, while the other organic N components and total N contents are highest in mixed broad-leaved forest. With the increase of the soil depth, the contents of total N, non-acid hydrolysis N, acid hydrolysis N and its components show a downward trend. Soil acid hydrolysis N accounting for 68.06% of total N is the predominant part of soil N. The content of each component of organic nitrogen and its proportion to total nitrogen in descending order are on-acid hydrolysis N and unknown N, amino acid N and acid hydrolysis ammonia N, and amino sugar N.

关 键 词：林分类型 林分土壤 总氮 有机氮组分 

分 类 号：S714.8[农业科学—林学]