北京山区典型人工林土壤团聚体组成及其有机碳分布特征  

Soil Aggregate Composition and Distribution Characteristics of Soil Organic Carbon of Typical Plantations in Mountainous Area of Beijing

作　　者：黄晓强[1] 信忠保[1] 赵云杰[1] 马凤原 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083 [2]密云县园林绿化局,北京101500

出　　处：《水土保持学报》2016年第1期236-243,共8页Journal of Soil and Water Conservation

基　　金：北京高等学校"青年英才计划"项目(YETP0753);中央高校基本科研业务费专项(TD2011-2)

摘　　要：以北京密云县红门川流域典型造林树种油松和侧柏为研究对象,在各林龄段的油松和侧柏（35a,40a和57a生油松林;20a,40a,57a侧柏人工林以及天然次生侧柏林）林内分别设置15m×15m样地,在每个样地中分层采集土壤样品,进行土壤理化性质的测定,并分析不同林龄油松和侧柏人工林土壤水稳性团聚体含量及其有机碳储量的分布特征。结果表明：（1）油松和侧柏人工林土壤均以水稳性小团聚体（粒径〈0.25mm）含量为主,分别为（40.64±7.64）%和（41.14±7.47）%,而大团聚体主要分布在0.5～1mm径级,分别为（21.13±5.48）%和（22.78±4.36）%;（2）随着林龄的增大,侧柏和油松林地的各粒径团聚体有机碳含量及土壤有机碳储量均呈增加的趋势。在不同植被恢复措施下,侧柏林地平均土壤有机碳含量和土壤有机碳储量均高于油松林,在不同径级团聚体均有很好的表现,表明侧柏人工林碳汇效益较油松林显著;（3）油松和侧柏2种典型人工林均以0.5～1.0mm径级的大团聚体土壤有机碳含量最高,分别为（12.63±8.65）g/kg和（18.40±7.79）g/kg。而土壤有机碳存储均以小团聚体（粒径〈0.25mm）为主要存储径级,分别占总量的（52.29±8.82）%和（51.16±4.63）%,其次为0.5～1.0mm大团聚体。In this paper,the main afforestation tree species in the Hongmengchuan watershed of Miyun county of Beijing,Pinus tabuliformis and Platycladus orientalis,were selected as the research objects,and the sample plots（15m×15m）were set up in Pinus tabuliformis plantations of 3different stand ages（35years old,40 years old and 57 years old）and Platycladus orientalis plantations of 4stand ages（20years old,40 years old,57 years old and natural secondary Platycladus orientalis forest）.In each sample plot,soil samples were collected from the soil layers of 0—10cm,10—20cm,20—30cm,and 30—40cm,respectively,followed by the determination and analysis of soil physical and chemical properties.We also analyzed the contents of water-stable aggregates and the distribution characteristics of organic carbon in soil aggregates in Pinus tabuliformis and Platycladus orientalis plantations.The results showed that：（1）In both Pinus tabuliformis and Platycladus orientalis plantations,soil aggregates were dominated by small water-stable aggregates（0.25mm）,which occupied（40.64±7.64）% and（41.14±7.47）% of soil aggregate content in Pinus tabuliformis and Platycladus orientalis plantations,respectively.The macro-aggregates were mainly belonged to 0.5～1 mm soil aggregates,which occupied（21.13±5.48）% and（22.78±4.36）% of soil aggregate content in Pinus tabuliformis and Platycladus orientalis plantations,respectively.（2）The soil organic carbon content and stock in Pinustabuliformisand Platycladus orientalis plantations increased with the increase of stand age.Under a variety of vegetation restoration measures,soil organic carbon content and stock in Platycladus orientalis forestland were higher than those in Pinus tabuliformis forestland,which were observed in soil aggregates of different particle sizes in 2typical plantations.Obviously,the carbonsequestration benefits of Platycladus orientalis plantation were more significant than those of Pinus tabuliformis plantation.（3）Soil organic carbon

关 键 词：土石山区 油松 侧柏 团聚体 有机碳 林龄 

分 类 号：S714.2[农业科学—林学]