Aims

Numerous organisms show range expansions in response to current climate change. Differences in expansion rates, such as between plants and soil biota, may lead to altered interactions in the new compared to the original range. While plant-soil interactions influence plant performance and stress tolerance, the roles of specific soil organisms driving these responses remain unknown.

Methods

We manipulated the abundances of nematodes and arbuscular mycorrhizal fungi (AMF), collected from original and new range soils, and examined their effects on the biomass of range-expanding Centaurea stoebe and native Centaurea jacea. In the first approach, nematode and AMF communities were extracted from field soils, and inoculated to sterilized soil. In the second approach, the abundance of soil organisms in soil inocula was reduced by wet sieving; at first, plants were grown to condition the soil, and then plant-soil feedback was determined under ambient and drought conditions.

Results

The origin of soil communities did not influence the biomass production of range-expanding or native plant species, neither by addition nor by (partial) removal. However, after conditioning and under drought, range expanding C. stoebe produced more biomass with soil communities from the original range while C. jacea, native to both ranges, produced more biomass with new range soil communities.

Conclusions

We show that nematode and AMF communities from original and new range have similar effect on the growth of range expanding C. stoebe. Our results highlight that the effect of soil communities on plant growth increases after soil conditioning and under drought stress.

中文翻译：

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解开线虫和丛枝菌根真菌群落对原、新牧场土中扩林半人马生长的影响-【维普网】-仓储式在线作品出版平台-www.cqvip.com

宗旨

为应对当前的气候变化，许多生物体表现出范围扩大。与原始范围相比，扩展率的差异，例如植物和土壤生物群之间的差异，可能会导致新范围内的相互作用发生改变。虽然植物-土壤相互作用影响植物性能和胁迫耐受性，但驱动这些反应的特定土壤生物的作用仍然未知。

方法

我们操纵了从原始和新牧场土壤中收集的线虫和丛枝菌根真菌 (AMF) 的丰度，并研究了它们对扩大范围的Centaurea stoebe和本地Centaurea jacea生物量的影响。在第一种方法中，从田间土壤中提取线虫和 AMF 群落，并将其接种到经过消毒的土壤中。在第二种方法中，湿筛法减少了土壤接种物中土壤生物的丰度；首先，种植植物以调节土壤，然后在环境和干旱条件下确定植物-土壤反馈。

结果

土壤群落的起源不影响范围扩大或本地植物物种的生物量生产，无论是通过添加还是（部分）移除。然而，在调节和干旱后，范围扩大的C. stoebe产生更多的生物量与原始范围的土壤群落，而C. jacea原产于两个范围，产生更多的生物量与新的范围土壤群落。

结论

我们表明来自原始和新范围的线虫和 AMF 群落对范围扩大的C. stoebe的增长具有相似的影响。我们的结果强调，在土壤调理和干旱胁迫下，土壤群落对植物生长的影响会增加。