气候变化领域集成服务门户(CCPortal): Molecular dynamics of foliar litter and dissolved organic matter during the decomposition process

CCPortal

DOI	10.1007/s10533-020-00684-5
	Molecular dynamics of foliar litter and dissolved organic matter during the decomposition process
	Chen H.; Liu X.; Blosser G.D.; Rücker A.M.; Conner W.H.; Chow A.T.
发表日期	2020
ISSN	0168-2563
起始页码	17
结束页码	30
卷号	150 期号:1
英文摘要	Decomposing foliar litter organic matter (LOM) in forested watersheds is an essential terrestrial source of dissolved organic matter (DOM) to aquatic ecosystems. To evaluate the relationship of chemical composition between LOM and DOM, we collected freshly fallen leaves of white oak (Quercus alba) and conducted an 80-week field decomposition experiment along a small elevation gradient in a floodplain within the Congaree National Park, South Carolina. Foliar litters were collected for water extraction and instrumental analyses using pyrolysis GC/MS, UV/VIS and fluorescence spectrophotometry. Factor analyses of pyrolysates showed that fresh LOM was mainly composed of lignin compounds (LgC), phenolic compounds (PhC), and carbohydrate (Carb), and the change in composition was relatively small throughout the decomposition process. In contrast, there were two distinct chemical compositions of DOM in early (between 0–8 weeks) and late phases (between 16–80 weeks). The early phase had a higher percentage of PhC, but the late phase contained higher percentages of Carb, unsaturated hydrocarbon (UnSaH), aromatic hydrocarbon (ArH), and nitrogen-containing compounds (Ntg). The fluorescence emission-excitation matrix showed there was an increasing trend in humic and fulvic-like fractions in DOM over time, matching well with increases of UnSaH and ArH fractions from the results of pyrolysis GC/MS. Our study illustrated that the changes of chemical components in LOM and water extractable DOM were not parallel during the decomposition process and the degradation of lignin and phenolic compounds was one of the controlling factors on the production of DOM. © 2020, Springer Nature Switzerland AG.
英文关键词	Congaree National Park; Fluorescence emission–excitation matrix; Pyrolysis GC/MS; Quercus alba; White oak
语种	英语
scopus关键词	aquatic ecosystem; biochemical composition; chemical composition; deciduous tree; decomposition; dissolved organic matter; foliage; litter; molecular analysis; watershed; Congaree National Park; South Carolina; United States; Quercus alba
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153115
作者单位	Baruch Institute of Coastal Ecology and Forest Science, Clemson University, Georgetown, SC 29442, United States; Key Lab of Silviculture, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui, China; Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Department of Environmental Engineering and Earth Science, Clemson University, Clemson, SC 29634, United States; Biogeochemistry & Environmental Quality Research Group, Clemson University, PO Box 596, Georgetown, SC 29442, United States
推荐引用方式 GB/T 7714	Chen H.,Liu X.,Blosser G.D.,et al. Molecular dynamics of foliar litter and dissolved organic matter during the decomposition process[J],2020,150(1).
APA	Chen H.,Liu X.,Blosser G.D.,Rücker A.M.,Conner W.H.,&Chow A.T..(2020).Molecular dynamics of foliar litter and dissolved organic matter during the decomposition process.Biogeochemistry,150(1).
MLA	Chen H.,et al."Molecular dynamics of foliar litter and dissolved organic matter during the decomposition process".Biogeochemistry 150.1(2020).