Effects of exogenous nitrogen and phosphorus additions on DOM structural complexityin peatlands
ZHU Xiao-yan1, LU Yu-han1, WU Zhong1, DONG Xiang-qian1, WANG Qi-chen1, LIU Zhong-hui1, LU Yong-zheng2
1. Jilin Jianzhu University, Key Laboratory of Water Environment of Ministry of Education in Songliao Basin, Changchun 130118, China; 2. State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130112, China
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.
朱晓艳, 卢禹晗, 武忠, 董向前, 王琪琛, 柳钟惠, 路永正. 外源氮磷输入对泥炭地DOM结构复杂性的影响[J]. 中国环境科学, 2024, 44(12): 6807-6816.
ZHU Xiao-yan, LU Yu-han, WU Zhong, DONG Xiang-qian, WANG Qi-chen, LIU Zhong-hui, LU Yong-zheng. Effects of exogenous nitrogen and phosphorus additions on DOM structural complexityin peatlands. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6807-6816.
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