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首页> 外文期刊>Pedobiologia >Emissions of nitrous oxide from casts of tropical earthworms belonging to different ecological categories
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Emissions of nitrous oxide from casts of tropical earthworms belonging to different ecological categories

机译：属于不同生态类别的热带earth铸件中一氧化二氮的排放

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While earthworms' feeding behavior has been shown to be a key driver of greenhouse gas like nitrous oxide (N_2O) emissions for temperate species, this assessment remains to be demonstrated for tropical ones. This study constitutes a comparative assessment of the impact of different feeding strategies of tropical earthworms on their cast emissions of N_2O and the characterization of microbial communities associated with these emission dynamics. N_2O flux was determined in vitro from casts of 2 epigeic (Dichogaster annae and Eisenia andrei) and 4 endogeic/epiendogeic (Metaphire houlleti, Octolasion tyrtaeum, Pontoscolex corethrurus and Amynthas corticis) earthworm species in the presence or absence of acetylene. Casts of epigeic earthworms, fed on fresh coffee pulp, emitted about 392-fold higher amounts of N_2O than those of endogeic ones, fed on a tropical soil. Acetylene exposure significantly increased the cast emission rates indicating that (i) apart from N_2O, dinitrogen (N_2) is also emitted by earthworm casts, particularly by the epigeic guild (45%) and (ii) denitrification is the major microbial process responsible for these N-gas emissions from casts. Total bacteria were 10-fold higher in epigeic casts than endogeic but the relative abundance of nitrifier (AOB) and denitrifiers (nirK and nirS) was many times higher in endogeic casts than epigeic ones. The relative gene density of nosZ to (nirK+nirS) was 4-fold higher in epigeic casts than endogeic ones. Moreover, bacterial amoA gene abundance was higher in casts of all species than for their archaeal counterparts. Cast N_2O emission was positively correlated with nitrifier as well as denitrifier gene abundance, while it was positively correlated with epigeic nitrate and negatively with endogeic nitrate contents. Ammonium contents did not show any relationship with cast emissions. Mean ammonium and nitrate contents were many times higher in casts than food substrates except nitrate in endogeic casts which was 4-fold less than parent food substrate.
机译：尽管已证明worm的摄食行为是温带物种温室气体排放的主要驱动因素，如一氧化二氮（N_2O）排放，但对于热带物种而言，这种评估仍有待证明。这项研究构成了对热带earth的不同饲养策略对其N_2O释放排放的影响以及与这些排放动态相关的微生物群落特征的比较评估。在存在或不存在乙炔的情况下，从2种表皮（（Dichogaster annae和Eisenia andrei）和4种内ge /表ien（Metaphire houlleti，Octolasion tyrtaeum，Pontoscolex corethrurus和Amynthas corticis）earth的铸模中体外测定N_2O通量。以新鲜咖啡浆为食的epi earth的粪便排放的N_2O量比以热带土壤为食的内endo粪便的排放量高出约392倍。乙炔暴露显着提高了铸件的排放速率，这表明（i）除N_2O之外，earth铸件，尤其是大公会（45％）还排放二氮（N_2），并且（ii）脱氮是造成这些现象的主要微生物过程铸件排放的氮气。地表菌种中的细菌总数比内地菌种高10倍，但是内地菌种中硝化剂（AOB）和反硝化剂（nirK和nirS）的相对丰度是地表菌种的高很多倍。 nosZ相对于（nirK + nirS）的相对基因密度在地表植物中比在地表植物中高4倍。此外，所有物种的铸模中细菌amoA基因的丰度均高于其古细菌。铸态N_2O的排放量与硝化剂和反硝化基因的丰度呈正相关，而与表观硝酸盐呈正相关，而与表层硝酸盐含量呈负相关。铵含量与铸件排放没有任何关系。铸模中的平均铵和硝酸盐含量比食物基质高出许多倍，但内生铸模中的硝酸盐含量比母体食物基质低4倍。

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