Relating microarthropod community structure and diversity to soil fertility manipulations in temperate grassland
Relating microarthropod community structure and diversity to soil fertility manipulations in temperate grassland
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DOI：
10.1016/j.soilbio.2005.02.005
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发表时间：
2005-09-01
影响因子：
9.7
通讯作者：
Bardgett, RD
中科院分区：
文献类型：
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作者：
Cole, L;Buckland, SM;Bardgett, RD
我们的目的是在英国苏格兰自然环境研究委员会 (NERC) 土壤生物多样性站点进行 15 个月的营养物（钙和氮）操纵实验后，确定地下微型节肢动物群落（螨和跳虫）的多样性模式。我们发现微型节肢动物的密度随着土壤肥力的提高而增加，但我们没有检测到土壤微型节肢动物（螨虫和弹尾纲）多样性的同时变化。随着土壤肥力和植物生产力的提高，微型节肢动物的密度也随之增加，这表明土壤微型节肢动物群落主要受到自下而上的力量的调节，其驱动因素是植物向土壤的投入增加了能量转移，为动物群提供了更多的食物资源。然而，我们发现土壤微型节肢动物的多样性没有同时发生变化，这对土壤动物的多样性与其种群密度、初级生产力或养分控制导致的土壤条件的改善呈正相关的观点提供了很少的支持。然而，我们确实发现，更肥沃的地点的微型节肢动物群落包含更大比例的捕食者，这表明在土壤肥力提高的情况下，更多的能量被转移到更高的营养级。我们的研究结果表明，与植物群落不同，土壤动物多样性可能不会受到生产环境中竞争的强烈调节，因为捕食增加可能不会发生竞争排斥。虽然我们得出的结论是，迄今为止，我们研究地点的土壤微型节肢动物多样性尚未受到养分添加的影响，但从长远来看，我们预测群落组成和多样性可能会发生变化，很可能是通过对土壤食物网的自上而下的调节。 (c) 2005 Elsevier Ltd. 保留所有权利。
We aimed to identify patterns of diversity in a below-ground community of microarthropods (mites and Collembola) after 15 months of a nutrient (calcium and nitrogen) manipulation experiment, located at the Natural Environment Research Council (NERC) Soil Biodiversity Site in Scotland, UK. We found that microarthropod densities increased with elevated soil fertility, but we detected no concurrent change in the diversity of soil microarthropods (mites and Collembola combined). That microarthropod density increased concurrently with improvements in soil fertility and plant productivity suggests that soil microarthropod communities are predominately regulated by bottom-up forces, driven by increased energy transfer via plant inputs to soil, providing increased food resources for fauna. However, that we found no concurrent change in the diversity of soil microarthropods provides little support for the idea that the diversity of soil fauna is positively related to their population density, primary productivity or improvements in soil conditions resulting from nutrient manipulations. However, we did find that microarthropod communities of more fertile sites contained a greater proportion of predators suggesting that more energy was transferred to higher trophic levels under elevated soil fertility. Our findings suggest that unlike plant communities, soil faunal diversity may not be strongly regulated by competition in productive situations, since competitive exclusion might not occur due to increased predation. Whilst we conclude that soil microarthropod diversity at our study site has not been affected by the nutrient additions to date, in the longer term we predict that changes in community composition and diversity could arise, most likely through top-down regulation of the soil food web. (c) 2005 Elsevier Ltd. All rights reserved.