Article

Chamaecytisus ruthenicus as an indicator of soil conditions and ectomycorrhizal fungal associations in sandy soils
Chamaecytisus ruthenicus jako wskaźnik właściwości glebowych i społeczności grzybów ektomykoryzowych gleb piaszczystych
KAROL SOKOŁOWSKI, RADOSŁAW GAWRYŚ, DOROTA HILSZCZAŃSKA, TOMASZ JAWORSKI
Sylwan 168 (10):749-763, 2024
DOI: https://doi.org/10.26202/sylwan.2024046
Available online: 2024-11-17
Open Access (CC-BY)
Colias myrmidone • exchangeable cations • mycorrhiza • nitrogen • soil properties

Abstract
The aim of this research is to determine the state of the habitat, especially the soil conditions and the ectomycorrhizal fungal communities that influence the occurrence of the Chamaecytisus ruthenicus plant. It is the main food plant for caterpillars of the two highly endangered butterfly species, Colias myrmidone and Poliomomatus eroides. The research was conducted in northeastern Poland in the Knyszyńska Forest which marks the western limit of the species’ distribution in Europe. The analysis included soil samples from areas with confirmed presence of Ch. ruthenicus [A] as well as control samples from areas where the species was absent [B]. Compared to [A], soils for [B] were characterised by a 2−fold higher concentration of exchangeable Al3+ and Hex, a 2.3−fold higher nitrogen content, and a 2.7−fold higher value of organic carbon. A strong correlation was found between pH and exchangeable acidity, hydrolytic acidity and exchangeable Al3+ on [B] plots. No significant correlations were found between the above variables in [A] plots. The analysed soils were characterised by a low sorption capacity. The sum of exchangeable cations did not exceed the value of 1.7 with Ca2+ ions predominating. In [B] plots, ectomycorrhizae of ubiquitous taxa such as Tomentella sp., Thelephora terrestris and Wilcoxina mikolae were more numerous. In [A] plots, species−rich mycorrhizae were found including Hebeloma sp. and Laccaria sp. which are typical of young pine trees. Non−metric multidimensional scaling (NMDS) analysis showed a different intensity of physicochemical properties between plots, especially in the 10−20 cm layer. Our research has shown that relatively similar habitat conditions, especially climate and soil type, can be very different at the local spatial scale that they become the main factor limiting plant development. The research emphasises the importance of local soil conditions in assessing the state of the habitat. We propose that Ch. ruthenicus may serve as a useful indicator of soil acidity and the presence of mycorrhizal fungal communities. This enables the indirect monitoring of another endangered species’ conservation.

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