首页|Earthworms increase nitrogen uptake by lettuce and change short-term soil nitrogen dynamics
Earthworms increase nitrogen uptake by lettuce and change short-term soil nitrogen dynamics
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NSTL
Elsevier
? 2022 Elsevier B.V.Earthworms stimulate organic nitrogen (N) mineralization and this is linked to plant N uptake and N loss from soil. Earthworms may also simultaneously transfer N-rich residues into physically protected soil fractions and temporarily increase N stabilization. This study evaluated soil N transformations and lettuce N uptake in soil microcosms amended with 15N-labeled rice straw, with and without earthworms (Metaphire guillelmi), during a 45-day period. We measured the amount of straw N absorbed by lettuce, lost as N2O or in leachates, and remaining in bulk soil and aggregate fractions. Lettuce biomass increased significantly (P < 0.05) by 37% with earthworms, and a greater proportion of the N uptake by lettuce was from the soil native N pool rather than from straw N (soil-derived N in lettuce increased from 101 to 170 mg pot?1 with earthworms). Earthworms did not change N losses by leaching. Total cumulative N2O emissions were 29% greater with earthworms than without earthworms (P < 0.05), but the straw-derived cumulative N2O emission was three times lower with earthworms than without earthworms. Straw N was recovered in large macroaggregates (> 2 mm) and earthworm tissues in the microcosms with earthworms. There was 4.5% more straw N remaining in soil with earthworms, suggesting that earthworms temporarily increased the residence time of straw N. We propose that M. guillelmi stimulates short-term mineralization of soil native N, which is available for uptake by lettuce and increases the risk of N loss as N2O, while temporarily stabilizing straw N in the soil.
15N-labelingDistributionEarthwormStraw-derived N
Na L.、Liang B.、Hu C.、Hu R.、Wu Y.、Abail Z.、Whalen J.K.
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College of Resources and Environment Huazhong Agricultural University
Laboratory of Soil Fertility and Plant Nutrition Regional Center of Agricultural Research of Kenitra National Institute of Agricultural Research
Department of Natural Resource Science Macdonald Campus McGill University
NSTL
Elsevier
