不同林龄桉树人工林土壤有机碳的变化  

Changes of Soil Organic Carbon in Different-aged Eucalyptus Plantations

作　　者：王纪杰[1] 鲍爽[1] 梁关峰 俞元春[3] 

机构地区：[1]四川省林业调查规划院,四川成都610081 [2]南京市江宁区古里街道财政所,江苏江宁211164 [3]南京林业大学,江苏南京210037

出　　处：《四川林业科技》2015年第4期18-21,共4页Journal of Sichuan Forestry Science and Technology

基　　金：林业科技成果国家级推广项目;国家林业公益性行业科研专项(200804040)

摘　　要：对不同林龄的桉树人工林土壤有机碳的剖面分布特征进行了研究。结果显示,桉树人工林土壤总有机碳、易氧化态有机碳和稳定态有机碳含量均随土层深度的增加而减小。随林龄的增加呈现先增加后减小的折线变化,土壤总有机碳和易氧化态有机碳含量4 a时最大,二者正相关性极强;稳定态有机碳在2 a最大,4 a时下降幅度最大,与p H值呈极显著负相关关系。说明4 a桉树林地土壤养分含量最高,根系对稳定态有机碳的转化量最大。桉树根系可伸入1 m的土层吸收利用稳定态有机碳,反应其较强的吸收利用养分的能力,同时也降低了土壤碳汇稳定性。In this paper, studies were made of soil organic carbon in different-aged Eucalyptus plantations. The results showed that the content of soil organic carbon, readily oxidized organic carbon and chemical recalcitrant organic carbon decreased with the increase of soil depth. And along with the increase of the forest age, they first increased, and then decreased, displaying a broken-line change. The soil organic carbon and readily oxidized organic carbon had the maximum contents at the age of four, and had a very significantly positive correlation. Stable organic carbon reached the maximum at the age of two, and but had a maximum decrease extent at the age of four. This index had a highly significant negative correlation with pH. It meant that the soil quality aged 4 was the best in Eucalyptus plantations, and the maximum was the transformation amount of their stable organic carbon. Root systems of Eucalyptus could absorb chemical stable organic carbon under 1 m thick soil, exhibiting the root＇s great ability of absorbing nutrients, and also decreasing the stability of soil carbon sequestration at the same time.

关 键 词：桉树人工林 土壤总有机碳 易氧化有机碳 稳定态有机碳 相关性 

分 类 号：S792.39[农业科学—林木遗传育种]