Werger Luise, Bergmann Joana, Weber Ewald, Heinze Johannes
Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.
Institute of Biology, Dahlem Center of Plant Science (DCPS), Freie Universität Berlin, Berlin, Germany.
AoB Plants. 2020 Sep 14;12(5):plaa050. doi: 10.1093/aobpla/plaa050. eCollection 2020 Oct.
Wind influences the development, architecture and morphology of plant roots and may modify subsequent interactions between plants and soil (plant-soil feedbacks-PSFs). However, information on wind effects on fine root morphology is scarce and the extent to which wind changes plant-soil interactions remains unclear. Therefore, we investigated the effects of two wind intensity levels by manipulating surrounding vegetation height in a grassland PSF field experiment. We grew four common plant species (two grasses and two non-leguminous forbs) with soil biota either previously conditioned by these or other species and tested the effect of wind on root:shoot ratio, fine root morphological traits as well as the outcome for PSFs. Wind intensity did not affect biomass allocation (i.e. root:shoot ratio) in any species. However, fine-root morphology of all species changed under high wind intensity. High wind intensity increased specific root length and surface area and decreased root tissue density, especially in the two grasses. Similarly, the direction of PSFs changed under high wind intensity in all four species, but differences in biomass production on the different soils between high and low wind intensity were marginal and most pronounced when comparing grasses with forbs. Because soils did not differ in plant-available nor total nutrient content, the results suggest that wind-induced changes in root morphology have the potential to influence plant-soil interactions. Linking wind-induced changes in fine-root morphology to effects on PSF improves our understanding of plant-soil interactions under changing environmental conditions.
风会影响植物根系的发育、结构和形态，并可能改变植物与土壤之间随后的相互作用（植物 - 土壤反馈 - PSFs）。然而，关于风对细根形态影响的信息很少，而且风改变植物 - 土壤相互作用的程度仍不清楚。因此，在一项草地PSF田间试验中，我们通过控制周围植被高度来研究两种风强度水平的影响。我们种植了四种常见植物物种（两种禾本科植物和两种非豆科草本植物），土壤生物群落要么先前由这些物种或其他物种进行预处理，然后测试风对根冠比、细根形态特征以及PSFs结果的影响。风强度对任何物种的生物量分配（即根冠比）均无影响。然而，在强风强度下，所有物种的细根形态都发生了变化。强风强度增加了比根长和表面积，降低了根组织密度，尤其是在两种禾本科植物中。同样，在强风强度下，所有四个物种的PSFs方向都发生了变化，但强风与弱风强度下不同土壤上生物量生产的差异很小，在比较禾本科植物和草本植物时最为明显。由于不同土壤在植物有效养分和总养分含量方面没有差异，结果表明风引起的根系形态变化有可能影响植物 - 土壤相互作用。将风引起的细根形态变化与对PSF的影响联系起来，有助于我们更好地理解变化环境条件下的植物 - 土壤相互作用。
