期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 21, 页码 14979-14989出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c04240
关键词
Fenton reaction; hydroxyl radical; iron (oxyhydr)oxide; long-term fertilization; molybdenum bioavailability; nitrogen fixation; reactive oxygen species; stable isotope probing
资金
- National Natural Science Foundation of China [41977271]
- National Key Research and Development Program of China [2020YFC1806803]
- RUDN University Strategic Academic Leadership Program
- DFG [EXC2124, 390838134]
Long-term manure fertilization increases microbial diversity and content of iron (oxyhydr)oxides in soils, leading to higher Mo bioavailability and storage, as well as increased abundance of nifH genes and nitrogenase activity. This intensifies asymbiotic N fixation and provides a strategy for enhancing biological N fixation in agricultural ecosystems.
Nitrogen (N) fixation in soils is closely linked to microbially mediated molybdenum (Mo) cycling. Therefore, elucidating the mechanisms and factors that affect Mo bioavailability is crucial for understanding N fixation. Here, we demonstrate that long-term (26 years) manure fertilization increased microbial diversity and content of short-range ordered iron (oxyhydr)oxides that raised Mo bioavailability (by 2.8 times) and storage (by similar to 30%) and increased the abundance of nifH genes (by similar to 14%) and nitrogenase activity (by similar to 60%). Nanosized iron (oxyhydr)oxides (ferrihydrite, goethite, and hematite nanoparticles) play a dual role in soil Mo cycling: (i) in concert with microorganisms, they raise Mo bioavailability by catalyzing hydroxyl radical (HO center dot) production via the Fenton reactions and (ii) they increase Mo retention by association with the nanosized iron (oxyhydr)oxides. In summary, long-term manure fertilization raised the stock and bioavailability of Mo (and probably also of other micronutrients) by increasing iron (oxyhydr)oxide reactivity and intensified asymbiotic N fixation through an increased abundance of nifH genes and nitrogenase activity. This work provides a strategy for increasing biological N fixation in agricultural ecosystems.
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