康定木格措冷杉林土壤有机质水平及其预测  

Study on Soil Organic Matter and Predict its Storage of Abies faxoniana Forest in MuGecuo,Kangding

作　　者：陈颖[1,2] 雷波[1] 罗承德[1] 汪航玉[1] 马丹[1] 刘丽[1] 

机构地区：[1]四川农业大学林学院,四川雅安625014 [2]成都职业技术学院旅游学院,四川成都611433

出　　处：《水土保持学报》2013年第4期252-257,共6页Journal of Soil and Water Conservation

基　　金：国家"十一五"重大科技支撑计划项目(2006BAC01A11);四川农业大学创新团队计划项目(00370501)

摘　　要：采用分解袋法,在土壤表层按发生土层定位研究康定木格措冷杉林土壤有机质分解与积累特征,构建土壤有机质储量随时间变化模型。研究结果表明:定位研究区凋落物年产量2.82×103 kg,折算有机质归还量2.54×103 kg;土壤有机质储量A1层77.14×103 kg,A2层84.89×103 kg,土壤有机物质氧化系数A1层0.044,A2层0.034,折算有机物质年矿化量分别为A1层3.39×103 kg,A2层2.88×103 kg,凋落物有机质归还量远小于矿化量;凋落物腐殖化系数A1层0.597,A2层0.493,对土壤有机质的贡献量分别为A1层1.52×103 kg,A2层0.75×103 kg,土壤固碳潜力大;土壤表层有机质总储量162.03×103 kg,相对较高,但不稳定,随时间推移逐渐减少。提高森林生态系统的固碳能力将是进一步研究的重点。To predict the change of the storage of soil organic matter(SOM)over time in study areas,litter bag method was applied to simulate the decomposition and accumulation characteristics of SOM in the surface layer,a mathematical model of the SOM storage changes over time was built in the case of the soil genetic layers of Abies faxonianaforest located in Mugecuo,Kangding.The results showed that the amount of litter in the study areas was 2.82×103 kg,the amount of which turned to be SOM was 2.54×103 kg.The SOM storage in layer A1 was 77.14×103 kg and in layer A2 was 84.89×103 kg,respectively.The oxidation coefficient was 0.044and 0.034in A1 layer and A2 layer respectively.The mineralization amount of A1 layer was 3.39× 103 kg and that of A2layer was 2.88×103 kg.As we can see,the amount of the returned SOM was far less than the mineralization.The litter humification coefficients were 0.597(A1)and 0.493(A2),which led to the return of SOM were 1.52×103 kg(A1)and 0.75×103 kg(A2)respectively,which showed that the soil carbon sequestration potential of the study areas was high.The total SOM storage in the surface of soil layer was relatively high with a figure of 162.03×103 kg,but this was unstable and reduced gradually over time.Trying to improve the carbon sequestration capacity of the forest soil would be the focus in further research.

关 键 词：土壤有机质水平 冷杉林 腐殖化系数 氧化系数 

分 类 号：S714.2[农业科学—林学] S714.6