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Trade-offs and synergies between seed yield, forage yield, and N-related disservices for a semi-arid perennial grassland under different nitrogen fertilization strategies

Abstract : A 15N labeling and lysimeter experiment was conducted with mesocosms of a semi-arid Leymus chinensis grassland. The aim of the study was to evaluate the effects of N fertilization timing (fertilization in fall or spring) and rate (0, 56, and 112 kg-N ha−1 year−1) on ecosystem services (seed yield and forage yield), ecosystem disservices (N leaching surveyed during 1 year and emissions of NH3 and N2O integrated over 76 days after fertilization), and recovery of added fertilizer N in plants and soil. Seed and forage yields increased more under fall than spring N fertilization. Further, N fertilization was linked to higher soil NH3 and N2O emissions, particularly under high N rate for both NH3 (2.0 and 1.6 kg-N ha−1 under fall and spring N fertilization, respectively) and N2O (0.24 and 0.21 kg-N ha−1, respectively). N leaching was never observed. A significant N fertilization timing × rate interaction effect was observed on plant recovery efficiency of added fertilizer N (Plant-NRE). Plant-NRE was higher for high than moderate N rate, with + 13.2% (from 22.8 to 36%) and + 16.4% (from 28.2 to 44.7%) for fall and spring fertilization, respectively. Fertilizer N recovered in soil was highest for moderate N rate in fall (68% of total N fertilizer) and lowest for high N rate in spring (46%). Our results show synergies among the ecosystem services (seed and forage yields) and among the disservices (NH3 and N2O emissions), and trade-offs between the services and disservices, some of these synergies and trade-offs being modulated by N fertilization timing and rate. Our study is the first one analyzing the possibly interactive effects of the N fertilization timing and rate on this range of ecosystem services and disservices in semi-arid perennial grasslands, which can be useful for N risk: benefit analysis when evaluating N fertilization strategies.
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https://hal-univ-lyon1.archives-ouvertes.fr/hal-02473991
Déposant : Depot 1 Lyon 1 <>
Soumis le : mardi 11 février 2020 - 10:11:42
Dernière modification le : lundi 25 mai 2020 - 13:28:27

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Yujie Shi, Junfeng Wang, Xavier Le Roux, Chunsheng Mu, Yunna Ao, et al.. Trade-offs and synergies between seed yield, forage yield, and N-related disservices for a semi-arid perennial grassland under different nitrogen fertilization strategies. Biology and Fertility of Soils, Springer Verlag, 2019, 55 (5), pp.497-509. ⟨10.1007/s00374-019-01367-6⟩. ⟨hal-02473991⟩

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