当前位置: X-MOL 学术Soil Biol. Biochem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Effect of decomposition products produced in the presence or absence of epigeic earthworms and minerals on soil carbon stabilization
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2021-05-29 , DOI: 10.1016/j.soilbio.2021.108308
J. Barthod , M.F. Dignac , C. Rumpel

Microbial use efficiency is thought to greatly influence organic carbon storage in soils through the formation of decomposition products and their stabilization as organo-mineral complexes. Earthworm activity may play a significant role in these processes. Of the three ecological earthworm groups only two (endogeic and anecic species) are thought to be involved in soil organic carbon (SOC) stabilization as they are living in mineral soil. The aim of this study was to investigate the role of decomposition products produced, with and without minerals, by epigeic earthworms living at the litter-soil interphase for carbon stabilization. We investigated the impact of eight different types of decomposition products on CO2 emissions, microbial biomass, watersoluble C, mineral N and SOC pool allocation of an arenic cambisol during 79 days under laboratory conditions.

Our results indicated that the nature of decomposition products affected their impact on SOC mineralization and soil physico-chemical parameters. In general, the presence of epigeic earthworms during OM decomposition decreased CO2 emissions after soil addition of decomposition products and increased microbial carbon use efficiency when compared to those produced without earthworms. Mineral-containing decomposition products increased CO2 emissions after their addition to soil when compared to their mineral free counterparts. They also changed carbon allocation to physico-chemically protected pools, decreasing the contribution of particulate organic matter when compared to mineral free decomposition products. Extrapolation of the data showed that these short-term effects were not necessarily long-term in nature, but they also indicated that microbial products produced in the presence of epigeic earthworms and minerals may increase SOC sequestration in the amended soil. We therefore conclude that the nature of decomposition products is crucial for their fate in soil and that in contrast to the general paradigm, epigeic earthworms could have an important role to play in SOC sequestration through the formation of material susceptible to be protected, when incorporated into mineral soil.



中文翻译:

表生蚯蚓和矿物质存在与否产生的分解产物对土壤碳稳定的影响

微生物利用效率被认为通过分解产物的形成及其作为有机矿物复合物的稳定作用极大地影响土壤中的有机碳储存。蚯蚓活动可能在这些过程中发挥重要作用。在三个生态蚯蚓群中,只有两个(内生和无生种)被认为与土壤有机碳 (SOC) 稳定有关,因为它们生活在矿质土壤中。本研究的目的是研究生活在枯枝落叶-土壤界面的表生蚯蚓产生的分解产物(含矿物质和不含矿物质)对碳稳定的作用。我们研究了八种不同类型的分解产物对 CO 2 的影响 排放、微生物生物量、水溶性碳、矿物质 N 和 SOC 池分配在实验室条件下的 79 天里。

我们的结果表明,分解产物的性质影响了它们对 SOC 矿化和土壤理化参数的影响。一般来说,与没有蚯蚓生产的蚯蚓相比,在土壤中添加分解产物后,表生蚯蚓的存在减少了 CO 2排放,并提高了微生物碳的利用效率。含矿物质的分解产物增加了 CO 2与不含矿物质的对应物相比,它们添加到土壤中后的排放量。他们还改变了对物理化学保护池的碳分配,与不含矿物质的分解产物相比,减少了颗粒有机物的贡献。数据的推断表明,这些短期影响本质上不一定是长期的,但它们也表明,在表生蚯蚓和矿物质存在下产生的微生物产品可能会增加改良土壤中的 SOC 封存。因此,我们得出结论,分解产物的性质对其在土壤中的命运至关重要,并且与一般范式相反,表生蚯蚓可能通过形成易受保护的材料在 SOC 封存中发挥重要作用,

更新日期:2021-06-08
down
wechat
bug