干旱区生态环境知识资源中心(Arid): Transport and humification of dissolved organic matter within a semi-arid floodplain

Arid

	Transport and humification of dissolved organic matter within a semi-arid floodplain
	Dong Wenming; Wan Jiamin; Tokunaga Tetsu K; Gilbert Benjamin; Williams Kenneth H
来源期刊	Journal of Environmental Sciences
ISSN	1001-0742
出版年	2017
卷号	57 页码:24-32
英文摘要	In order to understand the transport and humification processes of dissolved organic matter (DOM) within sediments of a semi-arid floodplain at Rifle, Colorado, fluorescence excitation-emission matrix (EEM) spectroscopy, humification index (HIX) and specific UV absorbance (SUVA) at 254 nm were applied for characterizing depth and seasonal variations of DOM composition. Results revealed that late spring snowmelt leached relatively fresh DOM from plant residue and soil organic matter down into the deeper vadose zone (VZ). More humified DOM is preferentially adsorbed by upper VZ sediments, while non- or lesshumified DOM was transported into the deeper VZ. Interestingly, DOM at all depths undergoes rapid biological humification process evidenced by the products of microbial by-product-like (i.e., tyrosine-like and tryptophan-like)matter in late spring and early summer, particularly in the deeper VZ, resulting in more humified DOM (e.g., fulvic-acid-like and humic-acid-like substances) at the end of year. This indicates that DOM transport is dominated by spring snowmelt, and DOMhumification is controlled by microbial degradation, with seasonal variations. It is expected that these relatively simple spectroscopic measurements (e.g., EEM spectroscopy, HIX and SUVA) applied to depth- and temporally-distributed pore-water samples can provide useful insights into transport and humification of DOM in other subsurface environments as well.
英文关键词	Dissolved organic matter Transport Humification Semi-arid Fluorescence excitation-emission matrix
类型	Article
语种	英语
开放获取类型	Green Published
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:6014553
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335826
作者单位	Dong Wenming, Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.; Wan Jiamin, Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.; Tokunaga Tetsu K, Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.; Gilbert Benjamin, Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.; Williams Kenneth H, Earth and Environment Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, 94720, USA.
推荐引用方式 GB/T 7714	Dong Wenming,Wan Jiamin,Tokunaga Tetsu K,et al. Transport and humification of dissolved organic matter within a semi-arid floodplain[J],2017,57:24-32.
APA	Dong Wenming,Wan Jiamin,Tokunaga Tetsu K,Gilbert Benjamin,&Williams Kenneth H.(2017).Transport and humification of dissolved organic matter within a semi-arid floodplain.Journal of Environmental Sciences,57,24-32.
MLA	Dong Wenming,et al."Transport and humification of dissolved organic matter within a semi-arid floodplain".Journal of Environmental Sciences 57(2017):24-32.