Parastās kļavas Acer platanoides un platlapu liepas Tilia platyphyllos augu sabiedrības Bārtas upes ielejā

Inglés. Up to now, few localities of an alien woody species Tilia platyphyllos have been observed in natural and near-natural forest stands in Latvia. In 2016, a neophytic community formed by Acer platanoides and Tilia platyphyllos have been described in the Bārta River valley in southwestern Latvia (56º 21 ́ N; 21º 13 ́ E). The species composition and structure of the community is similar to the native Acer platanoides-Tilia platyphyllos community widespread in Central Europe. In total 41 vascular plant species and five bryophyte species were recorded in the described community. In the tree layer, dominated by Acer platanoides and Tilia platyphyllos, totally six species were found. Successful spread and regeneration of both dominant species were observed. In understory, the most frequent species were Ribes alpinum and Padus avium. In herbaceous layer, totally 27 plant species were recorded; the ground vegetation was dominated by vascular plants Aegopodium podagraria, Mercurialis perennis, Brachypodium sylvaticum, Dryopteris filix-mas, and mosses Plagiomnium undulatum and Eurhynchium angustirete. In Latvia, spreading of Tilia platyphyllos in wild and formation of forest communities with presence of Tilia platyphyllos is promoted by environmental eutrophication, which is caused by intensified nitrogen cycling in ecosystems with various degree of disturbance as well as increased average temperatures and human mobility.

Letón. Līdz šim Latvijā ir novērotas atsevišķas platlapu liepas (Tilia platyphyllos) augšanas vietas dabiskās vai daļēji dabiskās mežaudzēs. 2016. gadā Dienvidrietumlatvijā, Bārtas upes ielejā terases nogāzē ir aprakstīta parastās kļavas-platlapu liepas neofīta augu sabiedrība, kas pēc sugu sastāva un novietojuma ir līdzīga tāda paša nosaukuma Viduseiropā izplatītajai augu sabiedrībai. Pašlaik platlapu liepas naturalizāciju Latvijā un augu sabiedrību veidošanos ar šo sugu sekmē vides eitrofikācijas process, kura galvenie iniciējošie komponenti ir intensīvāka slāpekļa aprite dažādā pakāpē ietekmētās un pārveidotās ekosistēmās, siltuma resursu un cilvēka mobilitātes pieaugums.