Exotic grass litter modulates seasonal pulse dynamics of CO2 and N2O, but not NO, in Mediterranean-type coastal sage scrub at the wildland-urban interface
Exotic grass litter modulates seasonal pulse dynamics of CO2 and N2O, but not NO, in Mediterranean-type coastal sage scrub at the wildland-urban interface
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在荒地与城市交界处的地中海型沿海鼠尾草灌木丛中,异国草凋落物调节 CO2 和 N2O 的季节性脉冲动态,但不调节 NO
DOI:
10.1007/s11104-020-04722-x
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发表时间:
2020
期刊:
影响因子:
4.9
通讯作者:
Jenerette, G. Darrel
中科院分区:
文献类型:
--
作者:
Andrews, Holly M.;Jenerette, G. Darrel
AimsMediterranean shrublands adjacent to urbanization experience nitrogen deposition and exotic grass invasions which likely have downstream consequences for carbon and nitrogen emissions from soils. We tested a hypothesis that soil wetting produces trace gas pulses modified by seasonal wetting history, grass litter availability, and cover type in these systems.MethodsOver two seasons, we conducted 48-h wetting experiments and measured CO2, N2O, and NO pulses at an invaded, polluted California shrubland following grass litter addition to sites dominated by either an invasive grass (Schismus barbatus)or a native shrub (Erioginum fasciculatum).ResultsCO2and N2O pulses consistently appeared 15 min post-wetting and diminished within 12 h; NO peaked later and remained elevated at 24 h. All pulses were stronger in the dry season than wet season. Grass litter amendments increased CO2and dry-season N2O pulses without significantly modifying NO pulses. Grass cover reduced CO2pulses compared to shrub cover.ConclusionsOur results support the hypothesis that shrubland soils produce stronger pulses of CO2, N2O, and NO during the dry season when wetting is less frequent. We show that invasive grass litter can provide a labile C source that stimulates CO2and N2O, but not NO, emissions from shrubland soils.
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