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首页> 外文期刊>Microbial Ecology: An International Journal >Environmental Controls on Fungal Community Composition and Abundance Over 3 Years in Native and Degraded Shrublands
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Environmental Controls on Fungal Community Composition and Abundance Over 3 Years in Native and Degraded Shrublands

机译：三年来原生和退化灌木丛中真菌群落组成和丰度的环境控制

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Soil fungal communities have high local diversity and turnover, but the relative contribution of environmental and regional drivers to those patterns remains poorly understood. Local factors that contribute to fungal diversity include soil properties and the plant community, but there is also evidence for regional dispersal limitation in some fungal communities. We used different plant communities with different soil conditions and experimental manipulations of both vegetation and dispersal to distinguish among these factors. Specifically, we compared native shrublands with former native shrublands that had been disturbed or converted to pasture, resulting in soils progressively more enriched in carbon and nutrients. We tested the role of vegetation via active removal, and we manipulated dispersal by adding living soil inoculum from undisturbed native sites. Soil fungi were tracked for 3 years, with samples taken at ten time points from June 2006 to June 2009. We found that soil fungal abundance, richness, and community composition responded primarily to soil properties, which in this case were a legacy of plant community degradation. In contrast, dispersal had no effect on soil fungi. Temporal variation in soil fungi was partly related to drought status, yet it was much broader in native sites compared to pastures, suggesting some buffering due to the increased soil resources in the pasture sites. The persistence of soil fungal communities over 3 years in this study suggests that soil properties can act as a strong local environmental filter. Largely persistent soil fungal communities also indicate the potential for strong biotic resistance and soil legacies, which presents a challenge for both the prediction of how fungi respond to environmental change and our ability to manipulate fungi in efforts such as ecosystem restoration
机译：土壤真菌群落具有很高的局部多样性和周转率，但是人们对环境和区域驱动因素对这些模式的相对贡献仍然知之甚少。导致真菌多样性的局部因素包括土壤性质和植物群落，但也有证据表明某些真菌群落的区域扩散受到限制。我们使用了具有不同土壤条件的不同植物群落以及对植被和扩散的实验性操作来区分这些因素。具体来说，我们将原生灌木丛与曾经被干扰或转变为牧场的原始原生灌木丛进行了比较，从而导致土壤中碳和养分含量逐渐增加。我们通过主动清除来测试植被的作用，并通过从不受干扰的本地地点添加活土壤接种物来控制扩散。对土壤真菌进行了长达3年的跟踪，并于2006年6月至2009年6月的10个时间点进行了采样。我们发现土壤真菌的丰度，丰富度和群落组成主要对土壤特性产生响应，在这种情况下，这是植物群落的遗产降解。相反，分散对土壤真菌没有影响。土壤真菌的时间变化部分与干旱状况有关，但与牧场相比，其在原生地的分布要广得多，这表明由于牧场中土壤资源的增加而产生了一定的缓冲作用。在这项研究中，土壤真菌群落的持续存在时间超过3年，表明土壤特性可以充当强大的局部环境过滤器。大量持久的土壤真菌群落还表明了强大的生物抗性和土壤遗产的潜力，这对于预测真菌对环境变化的反应方式以及我们在诸如生态系统恢复等工作中操纵真菌的能力都提出了挑战。

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