Fertilization regime shifts the molecular diversity and chlorine reactivity of soil dissolved organic matter from tropical croplands

Du，Ling1; Liu，Yanmei1; Hao，Zhineng2; Chen，Miao3; Li，Liping4; Ren，Dong1,5,6; Wang，Junjian5

2022-10-15

10.1016/j.watres.2022.119106

WATER RESEARCH   Impact Factor & Quartile

0043-1354

1879-2448

Soil-derived dissolved organic matter (SDOM) is an important site-specific disinfection byproduct (DBP) precursor in watersheds. However, it remains unclear how fertilization regime shifts the molecular diversity and chlorine reactivity of SDOM in cropland-impacted watersheds. Here, we analyzed the spectroscopic and molecular-level characteristics of the SDOM from croplands that had different fertilization regimes (i.e., non-fertilization, chemical fertilization, straw return, and chemical fertilization plus straw return) for 5 years and evaluated the chlorine reactivity of the SDOM by determining the 24-h chlorine consumption and specific DBP formation potential (SDBP-FP). The SDOM level decreased by chemical fertilization and was not significantly altered by straw return alone or combined with chemical fertilizer. However, all fertilization regimes elevated the molecular diversity of SDOM by increasing the abundance of protein-, lignin-, and tannin-like compounds. The chlorine reactivity of SDOM was reduced by chemical fertilization, but was significantly increased by straw return. Typically, straw return increased the formation potential of specific trihalomethane and chloral hydrate by 339% and 56% via increasing the aromatics in SDOM, whereas chemical fertilization could effectively decrease about 231% of the increased specific trihalomethane formation potential caused by straw return. This study highlights that fertilization regime can significantly shape the molecular diversity and chlorine reactivity of the SDOM in croplands and that partially replacing chemical fertilizer with crop straw is an advantageous practice for reducing DBP risks in drinking water in cropland-impacted watersheds.

Chlorine reactivity Croplands Dissolved organic matter Fertilization Molecular diversity Straw return

SCI

English

NI Journal Papers

Corresponding

National Natural Science Foundation of China[41807379];

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:000862766500001

PERGAMON-ELSEVIER SCIENCE LTD

ENVIRONMENT/ECOLOGY

2-s2.0-85138148884

Scopus

1.College of Environmental Science and Engineering,China West Normal University,Nanchong,637009,China
2.Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing,10085,China
3.Institute of Environment and Plant Protection,Chinese Academy of Tropical Agricultural Sciences,Haikou,571101,China
4.Research and Development Center for Watershed Environmental Eco-Engineering,Advanced Institute of Natural Sciences,Beijing Normal University,Zhuhai,519087,China
5.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
6.Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,China West Normal University,Nanchong,637009,China

Du，Ling,Liu，Yanmei,Hao，Zhineng,et al. Fertilization regime shifts the molecular diversity and chlorine reactivity of soil dissolved organic matter from tropical croplands[J]. WATER RESEARCH,2022,225.

Du，Ling.,Liu，Yanmei.,Hao，Zhineng.,Chen，Miao.,Li，Liping.,...&Wang，Junjian.(2022).Fertilization regime shifts the molecular diversity and chlorine reactivity of soil dissolved organic matter from tropical croplands.WATER RESEARCH,225.

Du，Ling,et al."Fertilization regime shifts the molecular diversity and chlorine reactivity of soil dissolved organic matter from tropical croplands".WATER RESEARCH 225(2022).