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首页> 外文期刊>Belgian Journal of Zoology >Is duration of organic management reflected on nematode communities of cultivated soils?
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Is duration of organic management reflected on nematode communities of cultivated soils?

机译：有机管理的持续时间是否反映在栽培土壤的线虫群落上？

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摘要

The aim of this study was (a) to explore long-term responses of soil nematodes to the conversion from conventional to organic cultivation and (b) to differentiate them from the short-term responses to seasonal agricultural practices. Nematode communities were studied in terms of trophic and generic structure, life strategy and diversity, in asparagus cultivations along a gradient from conventional to organic under conversion (1 and 2 years), and certified organic (4 and 5 years). Samplings throughout the year were conducted with respect to seasonal agricultural practices. Changing management regime from conventional to organic cultivation seemed to initiate successional long-term changes in nematode communities, such as the gradual decline of phytoparasites in favour of bacterivores and fungivores, the gradual decrease of PPI, the increase of diversity. Alterations in the generic structure of the community were also revealed, driven mostly by the opposite trends of changes in abundance of Helicotylenchus vs. Heterocephalobus. Seasonal agricultural practices appeared to induce short-term responses of functional guilds of low colonizer-persister values (c-p I and 2) mostly, and were reflected in nematode indices, such as Maturity Index, Plant Parasitic Index, Enrichment Index, Channel Index but not Structure Index. Nematode responses at the generic level to seasonal agricultural practices seemed less intense than the ones imposed by changing management regime, and in the case of conventional cultivation they were almost entirely masked.
机译：这项研究的目的是（a）探索土壤线虫对传统栽培向有机栽培转化的长期反应，以及（b）将其与对季节性农业实践的短期反应区分开来。在营养和通用结构，生活策略和多样性方面研究了线虫群落，在芦笋栽培中沿从常规转化为有机转化的梯度（1年和2年）以及经过认证的有机转化（4年和5年）进行了研究。全年对季节性农业作法进行抽样。将管理方式从常规栽培改为有机栽培似乎可以引发线虫群落的长期长期变化，例如植物寄生虫逐渐减少，有利于细菌和真菌，PPI逐渐减少，多样性增加。还揭示了社区通用结构的变化，这主要是由于螺旋藻与异头畸形虫数量变化的相反趋势所致。季节性农作方法似乎主要引起低定居者-pers值（cp I和2）功能公会的短期反应，并反映在线虫指数上，例如成熟度指数，植物寄生性指数，富集指数，通道指数，但没有结构索引。一般而言，线虫对季节性农业实践的反应似乎不如改变管理制度而引起的反应强烈，就常规栽培而言，几乎完全被掩盖了。

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