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Titolo:
DISTURBANCE EFFECTS ON HERBACEOUS LAYER VEGETATION AND SOIL NUTRIENTSIN POPULUS FORESTS OF NORTHERN LOWER MICHIGAN
Autore:
ROBERTS MR; GILLIAM FS;
Indirizzi:
UNIV NEW BRUNSWICK,FAC FORESTRY & ENVIRONM MANAGEMENT,POB 44555 FREDERICTON NB E3B 6C2 CANADA MARSHALL UNIV,DEPT BIOL SCI HUNTINGTON WV 25755
Titolo Testata:
Journal of vegetation science
fascicolo: 6, volume: 6, anno: 1995,
pagine: 903 - 912
SICI:
1100-9233(1995)6:6<903:DEOHLV>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
HARDWOOD STANDS; ORGANIC-MATTER; SUCCESSION; FLOOR; HYPOTHESIS; ECOSYSTEM; DYNAMICS; AQUULTS; PLANTS;
Keywords:
CLEARCUTTING; CANONICAL CORRESPONDENCE ANALYSIS; DISTURBANCE; PLANT-SOIL RELATIONSHIP; SPECIES COMPOSITION; SPECIES DIVERSITY; SECONDARY SUCCESSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
54
Recensione:
Indirizzi per estratti:
Citazione:
M.R. Roberts e F.S. Gilliam, "DISTURBANCE EFFECTS ON HERBACEOUS LAYER VEGETATION AND SOIL NUTRIENTSIN POPULUS FORESTS OF NORTHERN LOWER MICHIGAN", Journal of vegetation science, 6(6), 1995, pp. 903-912

Abstract

Recent disturbance models have identified changes in resource availability as factors that control plant community response. Soil nutrient resources typically are assumed to change following forest disturbance, usually with nutrient availablity increasing initially and subsequently decreasing through later stages of succession. We examined the effects of disturbance (clearcut harvesting with a brief recovery period)on soil organic matter, pH and extractable soil nutrients in successional aspen forests of northern lower Michigan to determine relationships of these variables to changes in herbaceous layer vegetation. Two site types were identified: dry-mesic (glacial outwash sands, low in organic matter) and mesic (calcareous clay till, high in organic matter). Extractable nutrient concentrations were 1.5 to 3 times higher in the A(1) horizon of mesic sites than those of dry-mesic sites. Soil pH and cations increased after disturbance on mesic sites, but not on dry-mesic sites. Patterns of change with disturbance were less pronounced in lower horizons on both site types. Herb-layer species diversity increased after disturbance on mesic sites, but with decreases in the importance of shade-tolerant tree species and Maianthemum canadense. Species characteristic of open habitats (e.g. Pteridium aquilinum, Rubus spp., Fragaria virginiana, and Diervilla lonicera), increased in importance. Soil factors, species composition and diversity on dry-mesic sites changed little after disturbance, with Pteridium aquilinum and ericaceous species remaining dominant in both mature (55 - 82 yr) and disturbed (less than or equal to 15 yr) stands. These results suggest thatsoil nutrient resources do not always change through secondary succession and that patterns of change can be distinctly site-dependent. Disturbance response patterns in the herbaceous layer of these aspen forests are also site-dependent.

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Documento generato il 01/12/20 alle ore 16:45:30