After the Rhodies have 'gone'

Following the clearance of blanketing thickets of Rhododendron in parts of Cwmdulais a few years back, I have made a few casual records of what has been recolonising. The only lower plants (which currently provide the bulk of the ground cover) noted in a small sampling area during a casual Christmas Eve stroll, were (in decreasing levels of abundance) Campylopus introflexus, Cladonia chlorophaea agg., Dicranella heteromalla, Hypnum cupressiforme var. cupressiforme, Polytrichum juniperinum, Cladonia coniocraea and Dicranum scoparium. Clearly there is more diversity than this in the valley (see my previous post HERE on this subject), but to date recolonisation of cleared Rhododendron in the valley has been by a rather limited suite of species. Needless to say the Rhododendron is showing good signs of recovery!

A small, mildly basic flush at SN61730358 did provide a point of interest amongst this predominantly acid tolerant vegetation, with species noted (again in decreasing levels of abundance) including Dicranella varia, Riccardia chamedryfolia, Aneura pinguis, Cratoneuron filicinum, Didymodon fallax, Philonotis Fontana, Didymodon tophaceus, Didymodon insulanus, Pellia endiviifolia, Pohlia wahlenbergii var. wahlenbergii, Bryum pseudotriquetrum & Pseudocrossidium hornschuchianum. I'm not sure if this vegetation comprises recent colonists or was hiding beneath the Rhodendrons prior to clearance?

Rhododendron clearance pioneer bryophytes

Today I stopped to take a very quick look at an area on the valley sides of Cwmdulais (SN618035), which were cleared of dense stands of Rhododendron ponticum four years ago. Vascular plants seem very slow in recolonising and the ground was found to be largely dominated by bryophytes, with the most abundant species being Ceratodon purpureus and Polytrichum juniperinum, with frequent Atrichum undulatum, Bryum capillare, Campylopus introflexus, Cephaloziella divaricata, Dicranella heteromalla, Pogonatum aloides and Polytrichastrum formosum. No surprises, but a good indication of the pioneer bryophyte assemblage which develops following ‘Rhody’ clearance on open hillsides. For reference the adjacent vegetation on non-affected slopes is principally Bracken-dominated, though there are some signs of this slowly re-establishing in cleared areas.

Polytrichum juniperinum

Ceratodon purpureus & Dicranella heteromalla

Interestingly Yellowhammers still occupy the Rhody areas, both cleared and dense stands, and we saw 7+ nearby in Sandra's aunties garden.