Soil pore architecture and rhizosphere legacy define N2O production in root detritusphere

Kim, Kyungmin; Gil, Jenie; Ostrom, Nathaniel E.; Gandhi, Hasand; Oerther, Maxwell S.; Kuzyakov, Yakov; Guber, Andrey K.; Kravchenko, Alexandra N.

doi:10.1016/j.soilbio.2022.108565

Title: Soil pore architecture and rhizosphere legacy define N₂O production in root detritusphere

Journal Article · 28 January 2022 · Soil Biology and Biochemistry

DOI: https://doi.org/10.1016/j.soilbio.2022.108565 · OSTI ID:1876027

^[1];

^[2]; Ostrom, Nathaniel E. ^[2];

^[2]; Oerther, Maxwell S. ^[2];

^[3]; Guber, Andrey K. ^[2]; Kravchenko, Alexandra N. ^[2]

Michigan State Univ., East Lansing, MI (United States); Michigan State University Department of Plant, Soil and Microbial Sciences
Michigan State Univ., East Lansing, MI (United States)
Georg-August-Univ. Göttingen (Germany); RUDN Univ., Moscow (Russia)

Root detritusphere is one of the most important sources of N₂O, however, understanding of how N₂O emission from the detritusphere is influenced by soil properties remains elusive. Here, we evaluated the effects of pore architecture and soil moisture on N₂O emission during the decomposition of in-situ grown roots of switchgrass, an important bioenergy crop. We combined dual isotope labeling (¹⁵C and ¹⁵N) with zymography to gain insights into the location of the microbial N₂O production in soils with contrasting pore architectures. In the studied soil, the effect of soil pore architecture on N₂O emissions was 6 times greater than that of soil moisture. Soil dominated by > 30 μm Ø pores (i.e., large-pore soil) had higher chitinase activity than the soil dominated by < 10 μm Ø pores (i.e., small-pore soil), especially near the decomposing roots. The chitinase activity on the decomposing roots was positively correlated with emission of root-derived N₂O, indicating that N released from root decomposition was an important source of N₂O. Greater N₂O and N2 emission was induced by switchgrass roots in soils dominated by the large- compared to the small-pore soils. Here, the microenvironment developed near decomposing roots of the large-pore soil also resulted in positive N₂O priming. Our study challenged the traditional view on soil moisture as the main factor of N₂O production. Production and emission of N₂O was most intensive in microbial activity hotspots (i.e., rhizosphere legacy) in the large pores, where decomposed roots release mineral N as the main N₂O source.

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Research Organization:: Great Lakes Bioenergy Research Center, East Lansing, MI (United States)

Sponsoring Organization:: National Science Foundation Long-term Ecological Research Program; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0018409

OSTI ID:: 1876027

Journal Information:: Soil Biology and Biochemistry, Journal Name: Soil Biology and Biochemistry Vol. 166; ISSN 0038-0717

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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