外源氮磷输入对泥炭地DOM结构复杂性的影响

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Abstract This study investigated the impact of exogenous N and P additions and their interactions on DOM, focusing on its concentrations and structural complexity by analyzing their spectroscopic characteristics in the long-term N, P additions platform in the boreal peatlands. The results indicated that exogenous N and P additions did not significantly alter DOM concentration, but a significant increase in DOM aromatization, from 58.5% to 82.9%, under high nitrogen (N₍₂₎), low phosphorus (P₍₁₎), and combined N-P treatments. Additionally, the endogenous input of DOM was amplified in treatments with high phosphorus (P₍₂₎) and low nitrogen combined with high phosphorus (N₍₁₎P₍₂₎). Fluorescence analysis indicated that DOM primarily consisted of humic-like and protein-like substances. Individual N or P treatments were found to enhance the content of protein-like substances, whereas NP interactions predominantly increased the humic-like content. These results suggest that exogenous N and P additions increase the structural complexity of DOM by promoting plant growth and enhancing microbial activity in boreal peatlands.

Key words： peatlands exogenous nitrogen and phosphorus additions soil dissolved organic matter(DOM) three-dimensional fluorescence resistance to decomposition

Received: 11 May 2024

PACS:	X53
	X131.3

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	Articles by authors
	ZHU Xiao-yan
	LU Yu-han
	WU Zhong
	DONG Xiang-qian
	WANG Qi-chen
	LIU Zhong-hui
	LU Yong-zheng

Cite this article:

ZHU Xiao-yan,LU Yu-han,WU Zhong等. Effects of exogenous nitrogen and phosphorus additions on DOM structural complexityin peatlands[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6807-6816.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I12/6807

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