Distance- and density-dependent recruitment of common ragwort is not driven by plant-soil feedbacks

IF 3 2区 环境科学与生态学 Q2 ECOLOGY
Xiangyu Liu , Dong He , Klaas Vrieling , Suzanne T.E. Lommen , Chenguang Gao , T. Martijn Bezemer
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引用次数: 0

Abstract

Janzen-Connell effects state that the accumulation of host-specific natural enemies near parent plants can negatively affect their offspring. Negative plant-soil feedbacks can produce patterns of seedling performance predicted by Janzen-Connell effects and influence plant populations, but their relevance in field conditions remains unclear. Here, using spatial point-pattern analysis, we examine the spatial distribution of Jacobaea vulgaris to assess whether distance- and density-dependent predictions of Janzen-Connell effects are evident in the field. We established 27 replicated 64 m2 plots at two grassland sites and mapped positions of rosette-bearing and flowering J. vulgaris plants within each plot. To investigate temporal distribution patterns, we tracked plant positions repeatedly in three plots during a single season. Additionally, we tested whether these patterns are soil-mediated. Soil samples were collected underneath flowering plants and at a distance of 0.5 meter, and used to compare seed germination, seedling survival, and growth under controlled conditions. Furthermore, we measured J. vulgaris growth in soil from patches with high J. vulgaris densities and in soil from areas outside these patches. The density of rosette-bearing plants was lower at close distances from flowering plants than expected from null models, suggesting negative distance-dependent plant recruitment. The degree of clustering decreased over time from rosette-bearing to flowering plants, indicating density-dependent self-thinning. Seed germination was higher in soil further away from flowering J. vulgaris plants than in soil underneath plants at one site, but soil distance was not an overall significant factor in explaining seed germination. However, seedling mortality and biomass did not differ between soils collected at the two distances, and plants produced similar biomass in soil collected from inside and outside J. vulgaris patches. Our study demonstrates conspecific distance- and density-dependent plant recruitment in J. vulgaris in the field, but we found no evidence this depends on belowground natural enemies.

植物与土壤的反馈作用无法驱动普通豚草随距离和密度而变化的新陈代谢
扬森-康奈尔效应(Janzen-Connell effects)指出,亲本植物附近寄主特异性天敌的积累会对其后代产生负面影响。植物与土壤之间的负反馈会产生扬森-康奈尔效应所预测的幼苗表现模式,并影响植物种群,但它们在田间条件下的相关性仍不清楚。在这里,我们利用空间点模式分析,研究了雅各布海棠的空间分布,以评估扬森-康奈尔效应的距离和密度依赖性预测在野外是否明显。我们在两块草地上建立了 27 个 64 m2 的重复小区,并绘制了每个小区中莲座状和开花的雅各伯草植株的位置图。为了研究时间分布模式,我们在一个季节内对三个小区的植物位置进行了反复跟踪。此外,我们还测试了这些模式是否由土壤介导。我们在开花植物下方和 0.5 米处采集了土壤样本,用于比较种子发芽率、幼苗存活率以及受控条件下的生长情况。此外,我们还测量了粗壮绒毛草(J. vulgaris)在高密度种植区土壤中的生长情况,以及在这些种植区以外土壤中的生长情况。在与开花植株距离较近的地方,莲座状植株的密度低于空模型的预期,这表明植株的招募与距离有关。从莲座状植株到开花植株的集群程度随着时间的推移而降低,这表明密度依赖性自稀疏。在一个地点,离开花植物较远的土壤中的种子萌发率高于植物下的土壤,但土壤距离并不是解释种子萌发率的重要因素。不过,在两种距离采集的土壤中,幼苗死亡率和生物量并无差异,而且在草花斑块内外采集的土壤中,植物产生的生物量相似。我们的研究表明,在野外,褐花鸦胆子属植物的繁殖取决于同种间的距离和密度,但我们没有发现这取决于地下天敌的证据。
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来源期刊
Basic and Applied Ecology
Basic and Applied Ecology 环境科学-生态学
CiteScore
6.90
自引率
5.30%
发文量
103
审稿时长
10.6 weeks
期刊介绍: Basic and Applied Ecology provides a forum in which significant advances and ideas can be rapidly communicated to a wide audience. Basic and Applied Ecology publishes original contributions, perspectives and reviews from all areas of basic and applied ecology. Ecologists from all countries are invited to publish ecological research of international interest in its pages. There is no bias with regard to taxon or geographical area.
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