黄土高原不同林型对土壤腐殖质组成及胡敏酸性质影响的研究  

EFFECT OF DIFFERENT FOREST TYPES ON HUMUS COMPOSITION AND HUMIC ACID PROPERTIES OF SOIL ON THE LOESS PLATEAU

作　　者：李香兰[1] 张成娥[1] 程积民[1] 

机构地区：[1]中国科学院中国水利部西北水土保持所 712100

出　　处：《土壤学报》1992年第1期64-72,共9页Acta Pedologica Sinica

基　　金：国家科学基金资助项目

摘　　要：不同林型下土壤腐殖质研究表明:(1)当年枯枝落叶及表层土壤C/N值均以油松林地最大,沙棘林地最低;表层土壤C/N值与林龄、枯枝落叶C/N呈正相关,与枯枝落叶灰分含量呈负相关。(2)剖面中腐殖酸、胡敏酸、富里酸各平均值为白桦林地>辽东栎林地>辽东栎×山杨林地>山杨林地>沙棘林地>油松林地,即阔叶乔木林地>灌木林地>针叶林地;胡敏素平均值大小顺序与此完全相反。(3)表层土壤胡敏酸芳构化程度在子午岭的为:白桦林地>辽东栎林地>辽东栎×山杨林地>山杨林地>油松林地>沙棘林地;六盘山为:山杨林地>辽东栎林地。剖面芳构化程度为:三层>二层>一层。Investigation on the soil humus under different forest types indicated that: (1) In those years both litter and C/N ratio of surface soil were the highest in the pinto tabulaeformis forest lands, but the lowest in the Hippophae rhamnoides lands. The C/N ratio of surface soil was positively correlated with the age of forest and the C/N ratio of litter, but negatively correlated with the ash content of litter. (2) The average contents of humic acid, humin, fulvic acid in the soil profiles decreased in the following sequence: Betula platyphalla forest land>Quercu Liaotungensis land>Quercu Liaotungensis+Populus davidiana forest land>Populus davidiana forest land>Hippophae rhamnoides forest land>Pinus tabulaeformis forest land, i. e. broad-leaved arbon forest land>shrub forest land>coniferous forest land; but the average content of humin was in an opposite order. (3) The aromaticity of surface soil of the Ziwu Mountains declined in the following order: Betula platy phalla forest land>Quercus Liaotungensis forest land>Quercus Liaotungensis+Populus daviana forest land>populus daviana forest land>Pinus tabulaeformis forest land> Hippophae rhamnoides forest land; whereas that of the Liupan Mountain was in the order of Populus davidiana forest land>Quercus Liaotungensis forest land. The profile humic acid aromaticity of the Ziwu Mountains and the Liupan Mountain decreased in the following sequence: three layer>two layer>one layer.

关 键 词：林型 胡敏酸性质 土壤 腐殖质 

分 类 号：S718.516[农业科学—林学]