Effects of exogenous nitrogen and phosphorus additions on DOM structural complexityin peatlands
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.
peatlandsexogenous nitrogen and phosphorus additionssoil dissolved organic matter(DOM)three-dimensional fluorescenceresistance to decomposition
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