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Bronydd Mawr Agroforestry Site
- Bronydd Mawr (51o37'N 03o38'W) is an upland site at 330m a.s.l. situated near Brecon, Powys.
- Average annual rainfall is 1500mm
- Mean screen temperature is 8oC
- The soils overlie Old Red Sandstone and are predominantly well-drained acid brown earths
Bronydd Mawr Research Station
- There are two tree species, Sycamore (Acer pseudoplatanu)s and Hybrid larch (Larix eurolepis) planted at 3 densities; 100, 400 and 2500 stems ha-1.
- The 2500 trees ha-1 treatments are Farm Woodland Controls with no grazing.
- There is a sheep-grazed Agricultural Control which has no trees.
- The silvopastoral treatments are sheep grazed, trees are individually protected.
- Grazed plots are 0.6 ha in area and receive nitrogen at 160kg N ha-1 yr-1.
- Farm Woodland Controls are a minimum of 0.1 ha
- In addition there are sycamore and ash (Fraxinus excelsior ) planted at 400 stems ha-1 in plots that were sown with clover and receive zero N.
- On this site, trees are planted in rows oriented North-South on all plots.
- There are three replicates of all treatments and controls.
- Beulah ewes are mated to Texel rams (Suffolk prior to 1998)
- The Beulah has an average prolificacy of 1.3 lambs born per ewe.
- Mating commences in mid-October when ewes are removed from the experimental plots.
- Ewes are off-wintered on silage with the addition of concentrates in late pregnancy.
- Twins are lambed indoors, singles outside
- Grazing on the experimental plots starts after lambing in early April.
- Lambs are weaned in late July and removed from the plots.
- Site management conforms to National Network protocols.
- Data collection conforms to National Network standards.
- Annually recorded measurements include:-
- tree dimensions and survival,
- stock carrying capacity,
- lamb production,
- ewe condition,
- climate data (daily),
- soil nutrient status and foliage nutrients.
- Other studies conducted at Bronydd Mawr include:-
- bird and insect surveys,
- microclimate studies to evaluate light levels under canopies,
- monitoring of herbage production (quantity and quality),
- soil compaction,
- evaluation of tree protection systems,
- detailed botanical assessments, root studies.
Exclusion cages under hybrid larch (400 stems ha-1) to monitor herbage production