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Titolo:
Sapling dynamics in a southeastern Texas floodplain forest
Autore:
Hall, RBW; Harcombe, PA;
Indirizzi:
Auburn Univ, Dept Biol, Montgomery, AL 36117 USA Auburn Univ Montgomery AL USA 36117 , Dept Biol, Montgomery, AL 36117 USA Rice Univ, Dept Ecol & Evolutionary Biol, Houston, TX 77005 USA Rice UnivHouston TX USA 77005 & Evolutionary Biol, Houston, TX 77005 USA
Titolo Testata:
JOURNAL OF VEGETATION SCIENCE
fascicolo: 3, volume: 12, anno: 2001,
pagine: 427 - 438
SICI:
1100-9233(200106)12:3<427:SDIAST>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
RECRUITMENT;
Keywords:
big thicket; death rate; demographic variability; disturbance; light; permanent plot; recruitment rate; regeneration; understorey;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Hall, RBW Auburn Univ, Dept Biol, Montgomery, AL 36117 USA Auburn Univ Montgomery AL USA 36117 l, Montgomery, AL 36117 USA
Citazione:
R.B.W. Hall e P.A. Harcombe, "Sapling dynamics in a southeastern Texas floodplain forest", J VEG SCI, 12(3), 2001, pp. 427-438

Abstract

How much temporal variation in recruitment. mortality and change in size class occurs in the sapling layer of mature temperate forests in the absenceof large-scale exogenous disturbance? Using 15 years of data from a flood-plain forest in Big Thicket National Preserve, we found that year-to-year variation in demographic parameters was greater than we originally expected. Death rates were generally more variable than recruitment rates, and were much more variable for large saplings than for small ones. Small saplings of the 10 most common species had at least one year when they experienced two to eight times their long-term mean recruitment and death rates. Large saplings had at least one year when they experienced three to 10 times their long-term mean death rates and at least one year with two to seven times the long-term mean recruitment rate. Temporal patterns in sapling death rateswere related to flooding patterns, while temporal patterns in recruitment were related to the Palmer Drought Severity Index, an indicator of drought severity and soil moisture availability. We also identified apparently synchronous patterns of demographic response among less flood-tolerant species which differed from the responses of more flood-tolerant species. We demonstrated the effects of both climatic variation and light variation in affecting stand-wide sapling demographics in a forest where canopy gaps are important for regeneration, and where chronic understorey disturbance favours growth over survivorship as a sapling strategy.

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Documento generato il 29/03/20 alle ore 13:52:21