土壤学报2017，Vol.54Issue(4)：1038-1046,9.DOI:10.11766/trxb201610150572
δ13C标记林木残体碳在土壤团聚体中的分布
Distribution of δ13C-labeled Wood Residue Carbon in Soil Aggregates
摘要
Abstract
The pulse labeling technique was used to label 13C-enriched wood residue of Cunninghamia lanceolata sapling,which was then mixed,separately,with soil samples collected from the topsoil layers of a citrus orchard (Citrus aurantium),a fir plantation (Cunninghamia lanceolata),a secondary forest of Castanopsis carlesii,and a natural forest of Altingia gracilipes).To trace dynamics of fresh carbon in soil aggregates,the mistures were incubated at 20 ℃ for 90 d and then analyzed for distribution of 13C-labeled wood residue carbon in the three fractions of soil aggregates,i.e.＞ 250 μm,53 ～ 250 μm and ＜ 53 μ m.Results show that in the soil samples amended with 13C-labeled wood residue,δ13C value increased in all the fractions of soil aggregates,especially in the soil samples of the orchard.In all the soil samples,regardless of land use,δ13C value was the lowest in the ＜ 53 μm fraction of soil aggregates,and the highest in the 53 ～ 250 μm fraction.Once extraneous carbon was amended into the soil samples,the content of fresh carbon therein increased instantly.And the content of fresh carbon and δ13C value was higher in the root than in the leaf,as the ratio of C/N is higher in the former.In terms of content of fresh carbon,the three fractions of soil aggregates displayed an order of ＜53 μm ＞ 53～ 250 μm ＞ ＞250 μm,which indicates that a short term of incubation facilitates accumulation of fresh carbon in micro soil aggregates.关键词
δ13C/外源碳/土壤团聚体/土地利用方式Key words
δ13C/Exogenous carbon/Soil aggregates/Land use types分类
农业科技引用本文复制引用
李涵诗,毛艳玲,邹双全..δ13C标记林木残体碳在土壤团聚体中的分布[J].土壤学报,2017,54(4):1038-1046,9.基金项目
国家自然科学基金项目(30972346)、国家科技支撑计划(2014BAD15B01)和福建省自然科学基金项目(2011J01087)资助 Supported by the National Natural Science Foundation of China(No.30972346),National Key Technology R&D Program of China(No.2014BAD15B01),Natural Science Foundation of Fujian Province,China(No.2011J01087) （30972346）
