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Titolo:
The impact of sheep grazing on net nitrogen mineralization rate in two temperate salt marshes
Autore:
Kiehl, K; Esselink, P; Gettner, S; Bakker, JP;
Indirizzi:
Tech Univ Munich, D-85350 Freising Weihenstephan, Germany Tech Univ Munich Freising Weihenstephan Germany D-85350 stephan, Germany Koeman & Bijkerk Ecol Res & Consultancy, Haren, Netherlands Koeman & Bijkerk Ecol Res & Consultancy Haren Netherlands , Netherlands Univ Groningen, Lab Plant Ecol, Haren, Netherlands Univ Groningen Haren Netherlands en, Lab Plant Ecol, Haren, Netherlands Univ Kiel, Inst Bot, Biol Zentrum, D-2300 Kiel, Germany Univ Kiel Kiel Germany D-2300 st Bot, Biol Zentrum, D-2300 Kiel, Germany
Titolo Testata:
PLANT BIOLOGY
fascicolo: 5, volume: 3, anno: 2001,
pagine: 553 - 560
SICI:
1435-8603(200109)3:5<553:TIOSGO>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL BIOMASS; PLANT-GROWTH; VEGETATION; SUCCESSION; PSEUDOREPLICATION; LIMITATION; HERBIVORES; ECOSYSTEM;
Keywords:
grazing experiment; salt marsh; nitrification; seasonality; zonation; vegetation; nitrogen mineralization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Kiehl, K Tech Univ Munich, Hochanger 6, D-85350 Freising Weihenstephan, Germany Tech Univ Munich Hochanger 6 Freising Weihenstephan Germany D-85350
Citazione:
K. Kiehl et al., "The impact of sheep grazing on net nitrogen mineralization rate in two temperate salt marshes", PLANT BIO, 3(5), 2001, pp. 553-560

Abstract

Nitrogen mineralization rate was studied in grazing trials with three different stocking rates (0, 3, 10 sheep ha(-1)) in two man-made salt marshes, viz. a Puccinellia maritima-dominated low salt marsh and a high salt marsh dominated by Festuca rubra. Mineralization rates were derived from the amounts of mineral N which accumulated in situ during six-week incubation periods in tubes containing undisturbed soil cores from the upper 10 cm soil layer. The annual rates of net N mineralization were significantly higher in the better drained, high salt marsh (71 - 81 kg ha(-1) yr(-1)) than in the low salt marsh (39-49 kg ha(-1) yr(-1)). High amounts of belowground litter accumulated in the low salt marsh due to frequent water logging. Both IN mineralization and nitrification rate were negatively correlated with soil water content. In the Puccinellia maritima salt marsh, grazing had neither aneffect on N mineralization rates during any of the incubation periods nor on annual mineralization rates. In the Festuca rubra salt marsh, N mineralization rates increased earlier during spring at the intensively grazed sitethan at the moderately grazed and the ungrazed site. N mineralization and nitrification rates were significantly higher at the ungrazed site: than atthe intensively grazed site during the period of peak net IN mineralization from the end of April until mid-June. Although sheep grazing affected theseasonal pattern of N mineralization in the high marsh, grazing did not affect the annual rate of net N mineralization.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 01:06:54