The Role of Different Earthworm Species (Metaphire Hilgendorfi and Eisenia Fetida) on CO2 Emissions and Microbial Biomass during Barley Decomposition
The Role of Different Earthworm Species (Metaphire Hilgendorfi and Eisenia Fetida) on CO2 Emissions and Microbial Biomass during Barley Decomposition
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DOI：
10.3390/su11236544
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发表时间：
2019-11
期刊：
影响因子：
3.9
通讯作者：
Toru Hamamoto;Y. Uchida
中科院分区：
文献类型：
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作者：
Toru Hamamoto;Y. Uchida
蚯蚓通常被认为是土壤碳（C）和氮（N）循环的重要调节剂，但其物种对养分循环的影响以及在有机物质分解过程中与土壤微生物活性的相互作用尚不清楚。本文通过孵化实验研究了两种不同的地上型蚯蚓（M. hilgendorfi和E. fetida）对添加大麦渣（大麦粉）的农业土壤中C和N浓度及相关酶活性的影响。为了达到这一目的，包括四个处理：（1）M。hilgendorfi和大麦; fetida和大麦，（3）大麦没有蚯蚓，和（4）没有蚯蚓和没有大麦。培养32天后，我们测定了土壤pH值，无机氮，微生物量碳（MBC），水或热水可溶性碳，和土壤酶活性。我们还测量了孵化过程中的二氧化碳排放量。结果表明，土壤中的微生物活动对CO2的累积排放量没有影响。然而，M。与E相比，hilgendorfi有积累MBC（2.9 g kg-1土壤）和硝酸盐氮（39 mg kg-1土壤）的潜力。fetida（分别为2.5 g kg −1土壤和14 mg kg −1土壤）。总之，土壤微生物与土壤微生物之间的相互作用受土壤微生物种类的影响，从而影响土壤C和N动态。
Earthworms are commonly known as essential modifiers of soil carbon (C) and nitrogen (N) cycles, but the effects of their species on nutrient cycles and interaction with soil microbial activities during the decomposition of organic materials remain unclear. We conducted an incubation experiment to investigate the effect of two different epigeic earthworms (M. hilgendorfi and E. fetida) on C and N concentrations and related enzyme activities in agricultural soils with added barley residues (ground barley powder). To achieve this, four treatments were included; (1) M. hilgendorfi and barley, (2) E. fetida and barley, (3) barley without earthworms, and (4) without earthworms and without barley. After 32 days incubation, we measured soil pH, inorganic N, microbial biomass C (MBC), water or hot-water soluble C, and soil enzyme activities. We also measured CO2 emissions during the incubation. Our results indicated the earthworm activity in soils had no effect on the cumulative CO2 emissions. However, M. hilgendorfi had a potential to accumulate MBC (2.9 g kg −1 soil) and nitrate-N (39 mg kg −1 soil), compared to E. fetida (2.5 g kg −1 soil and 14 mg kg −1 soil, respectively). In conclusion, the interaction between soil microbes and earthworm is influenced by earthworm species, consequently influencing the soil C and N dynamics.