子午岭油松林灰褐土生化特征及保护有机碳能力分析研究  

Analytical Study of Biochemical Properties and Ability to Protect Organic-carbon on Chinese Pine Forest Gray Cinnamon Forest Soil in Ziwulin Mountain,Northwest China

作　　者：刘灵霞[1] 王金成[1] 刘建新[1] 王鑫[1] 

机构地区：[1]陇东学院生命科学系,甘肃庆阳745000

出　　处：《水土保持学报》2010年第6期94-98,104,共6页Journal of Soil and Water Conservation

基　　金：陇东学院科技创新基金项目(XYZK0705)

摘　　要：以子午林岭天然油松林与人工油松林下的灰褐土为对象,进行各组分生化特征和保护性有机碳的综合研究。通过密度分组和超声波技术将每个土样分为2个组分:自由轻组和重组,并分别分析每个组分的有机碳含量、碳水化合物含量和顽固性碳含量。结果表明:(1)整个土壤剖面上,天然油松林与人工油松林均为重组有机碳占明显优势,自由轻组次之,说明土壤中大部分有机碳是受物理保护的。随土壤深度增加,天然油松林自由轻组有机碳由41.36%下降为25.03%,而重组有机碳由58.64%上升为74.97%。人工油松林自由轻组有机碳由37.69%下降为21.49%,重组有机碳由62.31%上升为78.51%。(2)从顽固性指数看,两种林型轻组碳和重组碳的顽固性是相似的,在各层土壤中,轻组碳的顽固性比重组碳的顽固性高,受物理保护的有机质,其有机质质量也相对较高。Biochemical properties and ability to protect organic-carbon were comprehensively studied in this paper with the objects of natural Chinese pine forests grey cinnamon soil in Ziwulin mountain northwest part of china.The sample soils were divided into two groups by density differences and ultrasonic technique： free-light group and heavy group,and were separately studied the organic carbon content,carbohydrate content and obstinate carbon content of each group.The result shows that：（1）On the same soil profile,the organic-carbon content in heavy group of both natural Chinese pine forests and artificial chinese pine forests have more significant advantages than the light group＇s,which represents that majority organic-carbon in the soil are protected by physical factors.The organic-carbon content in free-light group of natural Chinese pine forests reduce from 41.36% to 25.03%;conversely,its content increase from 58.64% to 74.97% in heavy group.The organic-carbon content in free-light group of artificial Chinese pine forests reduce from 37.69% to 21.49%;conversely,its content increase from 62.31% to 78.51% in heavy group.（2）From the obstinate index,the obstinating degree of the free-light and heavy group of both two forest types has a significant similarity.At each soil layer,the obstinating degree of the free-light group is higher than the heavy group it is,meanwhile,the organic matter protected by the physical factor is higher than the unprotected.

关 键 词：子午岭 油松林 灰褐土 有机碳 物理保护 密度分组 

分 类 号：S153.622[农业科学—土壤学]