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Titolo:
Linking above-ground and below-ground effects in autotrophic microcosms: effects of shading and defoliation on plant and soil properties
Autore:
Mikola, J; Barker, GM; Wardle, DA;
Indirizzi:
Landcare Res, Lincoln 8152, New Zealand Landcare Res Lincoln New Zealand8152 are Res, Lincoln 8152, New Zealand Landcare Res, Hamilton, New Zealand Landcare Res Hamilton New ZealandLandcare Res, Hamilton, New Zealand
Titolo Testata:
OIKOS
fascicolo: 3, volume: 89, anno: 2000,
pagine: 577 - 587
SICI:
0030-1299(200006)89:3<577:LAABEI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON-NUTRIENT BALANCE; DELAYED INDUCIBLE RESISTANCE; ALASKA PAPER BIRCH; MICROBIAL BIOMASS; METABOLIC QUOTIENT; MINERAL-NUTRITION; HERBIVORY; NITROGEN; NITRATE; GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Mikola, J Univ Jyvaskyla, Dept Biol & Environm Sci, POB 35 YAC, FIN-40351 Jyvaskyla,Finland Univ Jyvaskyla POB 35 YAC Jyvaskyla Finland FIN-40351 a,Finland
Citazione:
J. Mikola et al., "Linking above-ground and below-ground effects in autotrophic microcosms: effects of shading and defoliation on plant and soil properties", OIKOS, 89(3), 2000, pp. 577-587

Abstract

Although factors affecting plant growth and plant carbon/nutrient balance - e.g., light availability and defoliation by herbivores - may also propagate changes in below-ground food webs, few studies have aimed at linking theabove-ground and below-ground effects. We established a 29-week laboratoryexperiment (similar to one growing season) using autotrophic microcosms tostudy the effects of light and defoliation on plant growth, plant carbon/nutrient balance, soil inorganic N content, and microbial activity and biomass in soil. Each microcosm contained three substrate layers - mineral soil,humus and plant litter - and one Nothofagus solandri var. cliffortioides seedling. The experiment constituted of the presence or absence of two treatments in a full factorial design: shading (50% decrease in light) and artificial defoliation (approximately 50% decrease in leaf area in the beginningof the growing season). At the end of the experiment a range of above-ground and below-ground properties were measured. The shading treatment reducedroot and shoot mass, root/shoot ratio and leaf production of the seedlings, while the defoliation treatment significantly decreased leaf mass only. Leaf C and N content were not affected by either treatment. Shading increased NO3-N concentration and decreased microbial biomass in humus, while defoliation did not significantly affect inorganic N or microbes in humus. The results show that plant responses to above-ground treatments have effects which propagate below ground, and that rather straightforward mechanisms may link above-ground and below-ground effects. The shading treatment, which reduced overall seedling growth and thus below-ground N use and C allocation,also led to changes in humus N content and microbial biomass, whereas defoliation, which did not affect overall growth, did not influence these below-ground properties. The study also shows the carbon/nutrient balance of N. solandri var. cliffortioides seedlings to be highly invariant to both shading and defoliation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:42:44