1,720,979 research outputs found
Acidification of European croplands by nitrogen fertilization: Consequences for carbonate losses, and soil health
No full texthttp://dx.doi.org/10.13039/501100001659 German Research Foundationhttp://dx.doi.org/10.13039/501100001809 National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100018647 RUDN Universit
In situ visualization of soil profile acidification and processes following nitrogen fertilization and liming
No full textTo shake or not to shake: 13C-based evidence on anaerobic methane oxidation in paddy soil
No full textTo shake or not to shake: Silicone tube approach for incubation studies on CH4 oxidation in submerged soils
No full textA novel belowground in-situ gas labeling approach: CH4 oxidation in deep peat using passive diffusion chambers and 13C excess
No full textAnaerobic oxidation of methane in paddy soil: Role of electron acceptors and fertilization in mitigating CH4 fluxes
No full textWhite Clover does not Increase Soil N2O Emissions Compared to Ryegrass in Non-Frozen Winter, but Increases CH4 Uptake
No full textAbstract As one of the most important forage species in Europe, white clover ( Trifolium repens ) is a legume that is well recognized for its potential to increase productivity especially under reduced N input. It is hypothesized that legumes have the potential to decrease overwinter soil greenhouse gas (GHG) emissions due to more efficient N recycling as compared to non-legume forbs. We conducted a field experiment recording high-resolution soil nitrous oxide (N 2 O) and methane (CH 4 ) fluxes during the winter months (December 2019 to March 2020) on a five-year-old grassland in central Germany with white clover, fertilized and unfertilized perennial ryegrass ( Lolium perenne ), and bare soil. White clover and fertilized ryegrass stimulated soil N 2 O emissions by 174% and 212% as compared to bare soil, and by 36% and 56% as compared to unfertilized ryegrass, respectively, due to their greater N availability and higher water-filled pore space (WFPS). The estimated cumulative CH 4 fluxes under white clover were a net CH 4 sink, whereas ryegrass and bare soil were net CH 4 sources. Soil N 2 O fluxes were predominantly regulated by both mineral N and WFPS, while CH 4 fluxes were mainly explained by WFPS. N-fertilization during the growing season did not affect off-season N 2 O and CH 4 fluxes in perennial ryegrass plots. The combined non-CO 2 global warming potential highlighted the possible mitigation effect of white clover on overwinter GHG emissions. Our findings suggest that GHG emissions from legumes are not offsetting their productive benefits during the non-frozen winter seasons
The Effect of Synthetic Cow Urine on Microorganisms and Their Potential Phosphorus Mining Activity in Rhizosphere and Bulk Soil
No full textABSTRACT Background and aims Soil microbes adapt to varying nutrient inputs by modifying their utilization strategies, with root exudates and animal urine serving as key carbon (C) and nutrient sources in grasslands. Nonetheless, the specific mechanisms by which cow urine and root exudates influence microbial community and resource utilization remain elusive. This study investigates the differential effects of cow urine on microbial biomass, community composition and enzymatic activity in C‐rich (rooted) and C‐poor (vegetation‐free) soil. Methods A laboratory experiment was conducted using synthetic cow urine applied to a Vertic Cambisol soil, either densely rooted with Dactylis glomerata (C‐rich) or vegetation‐free (C‐poor). Destructive sampling occurred on days 1, 4 and 14. Microbial biomass (MBC, MBN and MBP), phospholipid fatty acids, DNA and enzymatic activities (acid phosphatase, β‐glucosidase) were analysed to assess microbial responses. Results DNA content was twice as high in C‐rich rooted as in C‐poor bulk soil. In C‐poor soil, urine strongly reduced DNA‐to‐MBC (−166%, day 14) and MBP‐to‐MBC (−23%, day 14), while increased MBN‐to‐MBC (+23% day 14). After 14 days of urine addition, phosphatase‐to‐β‐glucosidase ratios increased from 0.76 to 1.1 in C‐rich but declined in C‐poor soil. In C‐poor bulk soil, urine shaped the microbial community, whereas in C‐rich soil, root exudates dominated. Abundance of bacterial fatty acids increased from 2% to 22% over 14 days. Conclusions In C‐rich soil, urine stimulated microbial growth through C and nutrients availability from both roots and urine, thereby shifting enzymatic activity towards P mining. In contrast, microbial communities in C‐poor soil exhibited restrained growth and stable stoichiometric ratios, adapting to low nutrient supply. These findings highlight that microbial responses to urine input varied between rooted and bulk soil, emphasizing their relevance in soil microbial ecology.Deutsche Forschungsgemeinschaft https://doi.org/10.13039/50110000165
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