Plant-soil feedbacks: a comparative study on the relative importance of soil feedbacks in the greenhouse versus the field
Plant-soil feedbacks: a comparative study on the relative importance of soil feedbacks in the greenhouse versus the field
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DOI：
10.1007/s00442-016-3591-8
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发表时间：
2016-06-01
期刊：
影响因子：
2.7
通讯作者：
Joshi, J.
中科院分区：
文献类型：
--
作者：
Heinze, Johannes;Sitte, M.;Joshi, J.
植物和土壤微生物之间的相互作用影响植物个体的表现，从而影响植物群落的组成。大多数关于这种植物-土壤反馈（PSFs）的研究都是在受控温室条件下进行的，而没有研究直接比较温室和自然田间条件下的PSFs。我们种植了三种草，不同的地方丰富的草原社区，同时在温室和现场收集的土壤，无论是以前的条件，这些物种或一般的草原社区。由于草原土壤通常通过斑块和异质植物物种分布的物种混合来调节，因此我们还比较了物种特异性与非特异性物种调节对自然和温室条件下PSF的影响。在几乎所有的比较中，温室和田间的PSF不同。在温室中，植物生长在物种特异性和非特异性土壤中产生了类似的影响，中性的PSFs的最丰富的物种和积极的PSFs的丰富程度较低的物种。与此相反，在该领域的所有草种测试表现最好的非特定地块，而物种特异性的PSF是中性的最丰富的和丰富程度较低的物种。这表明植物多样性对该领域的PSF的一般有益影响。受控的温室条件可能提供有价值的见解土壤对植物的名义影响。然而，在温室条件下观察到的PSF可能不是自然植物群落中的决定性驱动因素，在自然植物群落中，它们的影响可能被田间地上和地下非生物和生物相互作用的多样性所压倒。
Interactions between plants and soil microorganisms influence individual plant performance and thus plant-community composition. Most studies on such plant-soil feedbacks (PSFs) have been performed under controlled greenhouse conditions, whereas no study has directly compared PSFs under greenhouse and natural field conditions. We grew three grass species that differ in local abundance in grassland communities simultaneously in the greenhouse and field on field-collected soils either previously conditioned by these species or by the general grassland community. As soils in grasslands are typically conditioned by mixes of species through the patchy and heterogeneous plant species' distributions, we additionally compared the effects of species-specific versus non-specific species conditioning on PSFs in natural and greenhouse conditions. In almost all comparisons PSFs differed between the greenhouse and field. In the greenhouse, plant growth in species-specific and non-specific soils resulted in similar effects with neutral PSFs for the most abundant species and positive PSFs for the less abundant species. In contrast, in the field all grass species tested performed best in non-specific plots, whereas species-specific PSFs were neutral for the most abundant and varied for the less abundant species. This indicates a general beneficial effect of plant diversity on PSFs in the field. Controlled greenhouse conditions might provide valuable insights on the nominal effects of soils on plants. However, the PSFs observed in greenhouse conditions may not be the determining drivers in natural plant communities where their effects may be overwhelmed by the diversity of abiotic and biotic above- and belowground interactions in the field.