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
Jenerette, G. Darrel
中科院分区:
农林科学2区
文献类型:
--
作者:
Andrews, Holly M.;Jenerette, G. Darrel

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目标邻近城市化的地中海灌木丛经历氮沉积和外来草入侵,这可能对土壤碳和氮排放产生下游影响。我们测试了一个假设,即土壤润湿会产生微量气体脉冲,这些脉冲会受到这些系统中季节性润湿历史、草屑可用性和覆盖类型的影响。方法在两个季节中,我们进行了 48 小时润湿实验,并测量了受入侵、污染的加州灌木丛中的 CO2、N2O 和 NO 脉冲,这些草屑添加到了以入侵草(Schismus barbatus)或本地灌木(Erioginum fasciculatum)为主的地点。 N2O 脉冲始终在润湿后 15 分钟内出现,并在 12 小时内减少; NO 稍后达到峰值,并在 24 小时内保持较高水平。所有豆类在旱季都比雨季更强。草屑改良剂增加了 CO2 和旱季 N2O 脉冲,但没有显着改变 NO 脉冲。与灌木覆盖相比,草覆盖减少了二氧化碳脉冲。结论我们的结果支持这样的假设:在干旱季节,当湿润不太频繁时,灌木丛土壤会产生更强的二氧化碳、氧化亚氮和一氧化氮脉冲。我们发现,入侵的草屑可以提供不稳定的碳源,刺激灌木丛土壤中二氧化碳和氧化亚氮的排放,但不会刺激一氧化氮的排放。
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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