Atrichum species

Atrichum species abundance within the area

The relative abundance of Atrichum undulatum and A. flavisetum on soil at upturned roots of fallen trees in 2006, 2018 and 2021–2023 is shown in Table 1. Despite of only little changes, in overall abundance of A. flavisetum is slightly growing in some places: e.g. in a ravine where only A. undulatum occurred in 2018, in later years, 2023-2024, A. flavisetum was recorded in many places.

The population density has been counted for three

Year N F+U,% F,% U,%

2006 46 80.5 6.5 13.0

2018 53 71.7 7.5 20.8

2021 48 75.0 16.7 8.3

2022 60 81.7 6.7 11.6

2023 26 61.5 7.7 30.8

plots 10 × 5 cm each for both species in early June, the The similar results for the same size plots were obtime when capsules are well developed. Number of shoots tained in late July, when capsules were partly fallen off, without capsules (S) / shoots with capsules (C) was found provided the similar counts by habitats from 5 × 3 cm to be as follow: plots ( Table 2). In addition, the angle of slope inclination A. flavisetum : 194 S / 203 C; 335 S / 364 C; 435S /430 C and soil pH were measured for each plot. Our data found no substantial difference in soil pH and number of shoots

A. undulatum : 521 S / 229 C; 428 S / 105 C; 312 S / 186 C

per plot. At the same time, it is clear from these observations that A. flavisetum almost never grows in flat places.

# Habitat U, n U, incl. 15 upturn (U above F) 86 50

16 upturn – 33

17 upturn, old 82 60

18 upturn, mix of U+F 115 75

12 ravine 173 84

13 ravine 72 62

11 soil bank along trail 76 54

19 soil bank along trail 109 34

20 trail side, flat 99 10

22 trail side, hummock 84 23

23 trail side, flat 147 14

U, pH F, n F, incl. F, pH 4,95 102 67 4,8 5,01 – 22 5,04 4,81 0 – – 4,84 146 75 5,29 5,37 99 45 5,15 5,48 125 63 5,25 4,64 74 50 4,66 4,5 0 – –

4,7 0 – – 4,58 0 – – 4,82 0 – –