Episodic N<sub>2</sub>O emissions following tillage of a legume–grass cover crop mixture
نویسندگان
چکیده
Abstract. Nitrogen (N) fertilizer inputs to agricultural soils are a leading cause of nitrous oxide (N2O) emissions. Legume cover crops an alternative N source that can reduce N2O emissions compared N. However, our understanding episodic flux following crop incorporation by tillage is limited and has focused on single-species crops. Our study explores whether increasing functional diversity with legume–grass mixture pulse tillage. In field experiment, we planted crimson clover (Trifolium incarnatum L.), cereal rye (Secale clover–rye mixture, no-cover control at two sites contrasting soil fertility properties in Michigan. We hypothesized the would be lower treatment because litter decrease mineralization rates. measured for approximately 2 weeks capture first peak each site. Across treatments, higher-fertility site, CF, had greater biomass, 2-fold-higher aboveground biomass N, higher cumulative than lower-fertility KBS (413.4±67.5 vs. 230.8±42.5 g N2O-N ha−1; P=0.004). There was significant effect daily both sites. At fluxes were 6 d after KBS, from 8 11 When controlling differences between sites, led fallow treatments. found partial support hypothesis clover. patterns differed suggesting interactions types background influence during decomposition.
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ژورنال
عنوان ژورنال: Biogeosciences
سال: 2022
ISSN: ['1726-4189', '1726-4170']
DOI: https://doi.org/10.5194/bg-19-3169-2022