Enchytraeid-stimulation of nitrogen mineralization from green plant residues in an organic soil

IF 2 3区 农林科学 Q3 ECOLOGY
Risako Kato , Karl Ritz , Koki Toyota
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Abstract

Faunal-mediated nutrient cycling, especially N mineralization, has the potential to make a significant contribution to nutrient supply to crop plants in production systems involving e.g. green manure cover crops. We investigated the effects of enchytraeids on N mineralization from mung bean residues in microcosm experiments using an organically-farmed soil with an inherently large population of enchytraeids. Enchytraeids promoted N mineralization by 23% after a distinct lag of between four and 12 weeks, concomitant with a substantial increase in population size followed by an almost complete collapse. Nitrogen release from the necromass would have contributed a small but significant fraction of the N mineralized, and the result suggested the presence of other mechanisms. Enchytraeids suppressed nematode populations, while did not affect the mean weight diameter (MWD) of soil aggregates, although mung bean residues increased MWD. We conclude that enchytraeids have potential to play significant roles in mediating N supply to crops but matching supply-and-demand periods may be challenging.

有机土壤中绿色植物残留物的氮矿化的酶促作用
在涉及绿肥覆盖作物等的生产系统中,动物介导的养分循环,尤其是氮的矿化,有可能对作物植物的养分供应做出重大贡献。我们在一个有机耕作的土壤中,利用固有的大量附甲龙种群,通过微宇宙实验研究了附甲龙对绿豆残留物中氮矿化的影响。在经过 4 到 12 周的明显滞后期后,随着种群数量的大幅增加,随后几乎完全崩溃,麦角菌促进了 23% 的氮矿化。从坏死物质中释放的氮只占矿化氮的一小部分,但也是很重要的一部分,这一结果表明还存在其他机制。Enchytraeids 可抑制线虫数量,但不会影响土壤团聚体的平均重量直径(MWD),尽管绿豆残留物会增加平均重量直径。我们的结论是,麦角菌有可能在调节作物的氮供应方面发挥重要作用,但匹配供需期可能具有挑战性。
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来源期刊
Pedobiologia
Pedobiologia 环境科学-生态学
CiteScore
4.20
自引率
8.70%
发文量
38
审稿时长
64 days
期刊介绍: Pedobiologia publishes peer reviewed articles describing original work in the field of soil ecology, which includes the study of soil organisms and their interactions with factors in their biotic and abiotic environments. Analysis of biological structures, interactions, functions, and processes in soil is fundamental for understanding the dynamical nature of terrestrial ecosystems, a prerequisite for appropriate soil management. The scope of this journal consists of fundamental and applied aspects of soil ecology; key focal points include interactions among organisms in soil, organismal controls on soil processes, causes and consequences of soil biodiversity, and aboveground-belowground interactions. We publish: original research that tests clearly defined hypotheses addressing topics of current interest in soil ecology (including studies demonstrating nonsignificant effects); descriptions of novel methodological approaches, or evaluations of current approaches, that address a clear need in soil ecology research; innovative syntheses of the soil ecology literature, including metaanalyses, topical in depth reviews and short opinion/perspective pieces, and descriptions of original conceptual frameworks; and short notes reporting novel observations of ecological significance.
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