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On the most base-rich soils in the UK, F.?sylvatica is most commonly associated with Fraxinus excelsior, and on other soils Quercus robur (Rodwell 1991). As soils become acidic and wetter, F.?sylvatica becomes a rare component of most communities. Other species that often http://www.selleck.cn/products/gdc-0068.html appear with beech are Acer pseudoplatanus, Ulmus glabra, Sorbus aria, Ilex aquifolium. and, in the Shropshire region, Aesculus hippocastanum as a planted tree (Sinker et?al. 1985). The performance of Fagus sylvatica is markedly influenced by habitat conditions. In eastern Europe, for example, it tends to grow more vigorously on the hills where summer temperatures and water stress are lower; on ascending further, the trees become progressively smaller towards the Kampfzone (struggle zone) of the tree line. This situation is well illustrated by Seifriz (1931) for the dense Fagus forest on the north side of the Yaila Plateau, Crimea. At 500?m, average tree height is 23?m and average trunk diameter 50?cm, increasing to 34?m and 47?cm at 720?m. Stature then decreases to 22?m and 28?cm at 1020?m, 18?m and 26?cm at 1200?m, and http://www.selleckchem.com/products/sch772984.html 12?m and 15?cm at 1300?m. At a slightly greater altitude, trees of this Crimean beech assume a typical Krummholz character and soon die out altogether. Seedlings of F.?sylvatica below a Picea abies canopy in southern Germany were found to increase in height at an average of 12.6 and 10.9?cm?year?1 over 7?years under 15% and 6.1% full PAR, respectively (Ammer, Stimm & Mosandl 2008). In similar German beechwoods, Pretzsch & Dieler (2011) found that between 1972 http://www.selleckchem.com/products/Bortezomib.html and 1980, beech trees with a mean diameter (d.b.h.) of 143?��?44?mm (SD, n?=?786) in 1972 grew in diameter 3.6?��?1.8?mm?year?1, and between 1999 and 2007 the same stand of trees, which were 223?��?74?mm d.b.h. at the beginning of the period (n?=?1374), grew by 2.1?��?2.0?mm. This compares to similar-sized Picea abies that grew by 4.8?��?2.0 (n?=?2466) and 3.5?��?2.6?mm (n?=?877), respectively, over the same periods. In beech forests in N.E. Spain, Barbeta et?al. (2011) investigated stands in a 2380?ha continuous ��forest�� and in ��fragments�� up to 52?ha in size. They found that the forest and fragments had a similar stand structure, but in the fragments the trees had greater crown damage (11.6% in fragments, 2.9% in forest) and a higher proportion of dead trees (7.2% in fragments, 4.7% in forest), and lower seedling density (774?ha?1 in fragments, 25 917?ha?1 in forest). However, juvenile survival was higher in the fragments (per cent of new seedlings surviving from the smallest into the next size class (