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Growth-rates of Hippophaë rhamnoides L.

1971; Oxford University Press; Volume: 35; Issue: 5 Linguagem: Inglês

10.1093/oxfordjournals.aob.a084541

1095-8290

J. S. LEDWOOD, D. W. Shimwell,

Marine and environmental studies

Six populations of the sea buckthorn, Hippophaē rhamnoides L are sampled systematically and graphs of age against stem diameter plotted. Regression analyses are used to derive the mean girth increase per annum for the whole of a population and for the population divided according to the stem age, i e 0–10 years and 11–40 years The six populations represent five major edaphic types of the Spurn Peninsula (I) stable dunes, sheltered, sand depth > 1 m, (II) unstable dunes, sheltered, sand depth > 1 m; (III) unstable, exposed dunes, sand depth > 1 m; (IV) stable dunes, sheltered, sand depth < 1 m over coarse gravel and mud, (v) stable dunes, sheltered, sand depth < 0.5 m over coarse shingle/sand mixture The annual growth increment for the whole population is shown to be greatest in the sheltered areas on deep sand, the highest figure recorded being 4.5 mm per annum The rate of growth for the plants up to 10 years old in the three populations on deep sand vanes between 3 88 and 4 5 mm per annum, whilst in shallow sand areas the range is between 2 0 and 2.8 mm per annum Girth increase in plants over 10 years slows down to 2 92 mm per annum in sheltered areas on deep sand, is considerably retarded in exposed areas on deep sand (1.53 mm per annum), and is least on shallow dunes (1 34 mm per annum).