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Titolo:
MICROCLIMATE ABOVE GRASS ADVERSELY AFFECTS SPRING GROWTH OF SEEDLING SNOW GUM (EUCALYPTUS-PAUCIFLORA)
Autore:
BALL MC; EGERTON JJG; LEUNING R; CUNNINGHAM RB; DUNNE P;
Indirizzi:
AUSTRALIAN NATL UNIV,RES SCH BIOL SCI,ECOSYST DYNAM GRP CANBERRA ACT 0200 AUSTRALIA CSIRO,CTR ENVIRONM MECH CANBERRA ACT 2601 AUSTRALIA AUSTRALIAN NATL UNIV,STAT CONSULTING UNIT,GRAD SCH CANBERRA ACT 0200 AUSTRALIA
Titolo Testata:
Plant, cell and environment
fascicolo: 2, volume: 20, anno: 1997,
pagine: 155 - 166
SICI:
0140-7791(1997)20:2<155:MAGAAS>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
COLD-INDUCED PHOTOINHIBITION; PHOTOSYNTHETIC PERFORMANCE; CHLOROPHYLL FLUORESCENCE; PINUS-SYLVESTRIS; HIGHLAND AREA; TEMPERATURE; DELEGATENSIS; COMPETITION; EFFICIENCY; AUSTRALIA;
Keywords:
EUCALYPTUS PAUCIFLORA SIEB EX SPRENG; MYRTACEAE; SNOW GUM; COLD-INDUCED PHOTOINHIBITION; COMPETITIVE INTERACTIONS (GRASS/TREE SEEDLINGS); MICROCLIMATE; MINIMUM TEMPERATURE AND PLANT GROWTH;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
M.C. Ball et al., "MICROCLIMATE ABOVE GRASS ADVERSELY AFFECTS SPRING GROWTH OF SEEDLING SNOW GUM (EUCALYPTUS-PAUCIFLORA)", Plant, cell and environment, 20(2), 1997, pp. 155-166

Abstract

Growth of snow gum seedlings (Eucalyptus pauciflora Sieb. ex Spreng.)was studied in response to differences in microclimate caused by differential heat exchange between seedlings, grass and bare, moist soil during winter and spring. Seedlings were planted in a pasture either directly into grassy groundcover or in circular patches of bare soil of 30, 60 or 120 cm in diameter, There were no differences in maximum airtemperatures at seedling leaf height between treatments. However, minimum air temperature increased by 2 degrees C with increase in patch diameter from 0 to 120 cm such that seedlings surrounded by grass experienced lower minimum temperatures with more frequent and more severe frosts than seedlings growing in large patches of bare soil These small-scale differences in minimum temperature affected both photosyntheticand growth processes. Over winter, seedlings were photoinhibited, with depression in midday F-v/F-m linearly related to minimum temperatures. In spring, repeated frosts and lower minimum temperatures led to a delay in the recovery of F-v/F-m, a delay in bud-break, damage to elongating stems and developing leaves, lower rates of stem elongation, and ultimately a shorter growing season for seedlings in grass compared to those in bare soil patches. Thus, microclimate above grass adversely affects spring growth of juvenile Eucalyptus pauciflora and may account for much of the competitive inhibition of tree seedling growth by grass during spring.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/06/20 alle ore 17:41:24