Protozoan Pulses Unveil Their Pivotal Position Within the Soil Food Web
Protozoan Pulses Unveil Their Pivotal Position Within the Soil Food Web
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DOI：
10.1007/s00248-011-9956-y
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发表时间：
2012-05-01
影响因子：
3.6
通讯作者：
Murray, Philip J.
中科院分区：
文献类型：
--
作者：
Crotty, Felicity V.;Adl, Sina M.;Murray, Philip J.
原生动物是土壤中最丰富的细菌捕食者之一，负责细菌生物量的矿化，对碳和氮循环有很大影响。人们对它们对土壤养分转移的贡献或消费者的身份知之甚少。本研究首次将原生鞭毛虫和纤毛虫（C-13和N-15分别富集83%和10%）引入同一土壤类型的草地和林地两种不同土地管理方式的土壤芯中，追踪原生动物C和N在土壤食物网中的流动。线虫、弹线虫、蚯蚓和昆虫幼虫在细胞死亡后通过直接消耗或吸收生物量获得的原生动物来源的碳和氮最多。我们的研究结果表明，管理的变化影响了土壤食物网的功能和原生动物作为食物来源的利用。
Protozoa are one of the most abundant groups of bacterivores within the soil and are responsible for mineralisation of bacterial biomass, having a large impact on C and N cycling. Little is known of their contribution to soil nutrient transfers or the identity of their consumers. Here, for the first time indigenous flagellates and ciliates, enriched to 83 atom% for C-13 and 10 atom% for N-15, were introduced to soil cores from two different land managements, grassland and woodland with the same soil type, to trace the flow of protozoan C and N through the soil food web. Nematodes, Collembola, earthworms and insect larvae obtained the greatest amounts of C and N of protozoan origin, either through direct consumption or uptake of biomass post-cell death. Our results show that changes in management, affect the functioning of the soil food web and the utilisation of protozoa as a food source.