摘要
为了解不同林型对土壤胡敏素组分的影响,以横断山脉纵谷区5种林型下暗棕壤为研究对象,采用腐殖质组成修改法和Pallo修改法相结合的方法对其腐殖质组成进行了分析。结果表明:(1)5种不同林型中丽江云杉林腐殖酸含量显著高于其他4种林型,不同林型土壤HA/FA表现为大果红杉林>川滇高山栎林>丽江云杉林>白桦林>丽江铁杉林;(2)5种不同林型土壤胡敏素组分中不溶性胡敏素占绝大部分,丽江云杉林土壤胡敏素各组分含量最高;(3)5种不同林型土壤Ah层HMi与HMc的分子结构较其他土层复杂,除川滇高山栎林的C层外,各林型土层ΔlgK皆表现为HMc>HMi,但E4/E6变化规律并不总是表现为HMc>HMi,其中HMc的分子结构在川滇高山栎林的C层最为复杂,而HMi的分子结构在丽江云杉林的Ah层最为复杂。因此,大果红杉林相对于其他林型土壤腐殖质品质较好,丽江云杉林更有利于土壤碳的积累。该研究结果以期为优化该区森林结构,提高森林系统固碳能力提供参考。
In order to understand the effects of different forest types on soil Humin components,the soils of five forest vegetations under the longitudinal valley of the Hengduan Mountains in Northwestern Yunnan were selected as research samples.The composition of humus was analyzed by humus composition modification method&modified Pallo method.The results showed that:(1)the humic acid content in stand of Picea likiangensis was significantly higher than those in the other four stands,the HA/FA of different stands presented the decreasing trend,and decreased in the order:Larix potaninii var.macrocarpa>Quercus aquifolioides>Picea likiangensis>Betula platyphylla Suk.>Tsuga forrestii Downie;(2)the insoluble humin of humin components in the five different stands accounted for the majority;the content of humin in the stand of Picea likiangensis was the highest,which was more beneficial to accumulation of soil carbon compared with other stands;(3)the molecular structure of HMi&HMc in topsoil were more complex than those of the other soil layers;in addition to the C layer in the stand of Larix potaninii var.macrocarpa,theΔlgK of each layer presented as HMc>HMi,but the E4/E6 did not always presented as HMc>HMi;the molecular structure of HMc&HMi was the most complex in the C layer of the stand of Quercus aquifolioides and the Ah layer of the stand of Picea likiangensis,respectively;therefore,the quality of humus in the stand of Larix potaninii var.macrocarpa was higher than those in the other stands.All these findings may provide reference for optimizing the forest structure and improving the carbon sequestration capacity of the forest system in this area.
作者
周红
何忠俊
肖蒙
秋新选
梁社往
ZHOU Hong;HE Zhongjun;XIAO Meng;QIU Xingxuan;LIANG Shewang(College of Resources and Environment,Yunnan Agriculture University,Kunming 650201,China;College of Agronomy and Biotechnology,Yunnan Agriculture University,Kunming 650201,China;Yunnan Institute of Forest Inventory and Planning,Kunming 650051,China)
出处
《水土保持研究》
CSCD
北大核心
2020年第2期48-54,共7页
Research of Soil and Water Conservation
基金
云南省科技厅自然科学基金面上项目(2006D0039M)
云南省第四次森林资源规划设计调查——森林土壤专业调查(00000000038-407).
关键词
横断山脉
不同林型
暗棕壤
胡敏素组分
光学性质
Hengduan Mountains
different forest types
dark-brown soil
humin composition
optical properties
