红松人工林腐殖质组成及其结合形态研究

 运用野外调查与实验分析相结合的方法,对不同生长发育阶段红松人工林（林龄25、45、58、68 a）和红松混交林（林龄60a）根际与非根际土壤有机质含碳量、腐殖质组成与结合形态进行了研究。结果表明:不同年龄阶段红松人工纯林、红松混交林土壤有机质含碳量、腐殖质各组分含碳量随土层深度的加深而降低,并且根际土壤高于非根际土壤。就土壤腐殖质组成而言,除林龄58a红松人工林根际土壤和45a红松人工林非根际土壤外,其他林型土壤胡敏酸含碳量均高于富里酸含碳量;胡敏酸与富里酸比值（HA/FA）在1.00～2.45之间;土壤重组腐殖质、松结态腐殖质、稳结态腐殖质含碳量大小顺序为林龄58>68>25>45a;红松混交林除紧结态腐殖质外,其他腐殖质各组分含碳量均高于红松人工林。

Study on compositions of soil humus and their combining forms of Pinus koraiensis plantations

Field investigation combined with quantitative analysis was used to study the carbon content of organic matter,compositions of soil humus and their combining forms in rhizosphere and non-rhizosphere soil in Pinus koraiensis plantations(25,45,58,68 years old) and the Pinus koraiensis-Tilia amurensis mixed forest(60 years old).The results showed that the carbon content of soil organic matter and each composition of soil humus in both Pinus koraiensis plantations and the Pinus koraiensis-Tilia amurensis mixed forest decreased with the increase of soil depth,and these in rhizophere soil were higher than those in non-rhizosphere soil.For compositions of soil humus,the carbon content of humic acid was higher than that of fulvic acid in all forest types except for the rhizophere soil in 58-year old plantation and the non-rhizophere soil in 45-year old plantation.The humic acid to fulvic acid ratio(HA/FA) ranged from 1.00 to 2.45.The carbon content of heavy fraction humus,loosely combined humus and stable combined humus was ordered as this 58-year old's>68-year old's >25-year old's>45-year old's.Carbon contents of other fractions of soil humus in the Pinus koraiensis-Tilia mixed forest were higher than that of Pinus koraiensis plantations except tightly combined humus.