Abstract
-Pinus taeda naturally invades Myrica cerifera thickets as the shrub community succeeds to a maritime forest on southeastern USA barrier islands. Potential mechanisms supporting the persistence of M. cerifera thickets on barrier islands were examined in an environmental chamber. The inhibitory effects of allelochemicals from M. cerifera leaf litter and the soil in which it grows, and the interaction between allelochemicals and light intensity were quantified for seed germination and seedling growth of P taeda. Germination of P taeda seeds was significantly reduced by treatment with leachate from dead M. cerifera leaves, but light level had no significant effect. In contrast, root, shoot and total seedling growth were significantly lower under low light (44 Rmol m-2 sec-1). Root growth under high light (300 Rmol m-2 sec-1) was significantly lower for P taeda seedlings grown in soil collected from beneath Myrica thickets. Both root and shoot growth of P taeda in Myrica soil were significantly higher in the presence of Myrica leaf litter in high light. Thus, litter accumulation may assist P taeda in invading Myrica thicket gaps, possibly by counteracting allelopathic effects of Myrica root exudate. Low light levels and allelopathic effects may interact and contribute to the persistence of Myrica thickets limiting root growth of invading P taeda seedlings, thereby reducing competition for space, soil moisture and nutrients.
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Claims 7
Claim · model-written summary
Leachate from dead Myrica cerifera leaves significantly reduced Pinus taeda seed germination.
- Taxon
- P taeda
Pinus taedae1 - Treatment
- leachate from dead M. cerifera leavese1
- Interactor
- M. cerifera
Morella ceriferae1other - Outcome
- Germinatione1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Germination of P taeda seeds was significantly reduced by treatment with leachate from dead M. cerifera leaves, but light level had no significant effect”
Claim · model-written summary
Light level had no significant effect on Pinus taeda germination.
- Taxon
- P taedaPinus taedae1
- Treatment
- light levele1
- Outcome
- Germinatione1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Germination of P taeda seeds was significantly reduced by treatment with leachate from dead M. cerifera leaves, but light level had no significant effect”
Claim · model-written summary
Root, shoot and total seedling growth were significantly lower under low light (44 Rmol m-2 sec-1).
- Taxon
- P taedaPinus taedae1
- Treatment
- low light (44 Rmol m-2 sec-1)e2
- Outcome
- root, shoot and total seedling growthe2
- Direction
- lowere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Germination of P taeda seeds was significantly reduced by treatment with leachate from dead M. cerifera leaves, but light level had no significant effect”
e2“root, shoot and total seedling growth were significantly lower under low light (44 Rmol m-2 sec-1)”
Claim · model-written summary
Root growth under high light was significantly lower for Pinus taeda seedlings grown in soil from beneath Myrica thickets.
- Taxon
- P taedaPinus taedae3
- Treatment
- soil collected from beneath Myrica thicketse3
- Outcome
- Root growthe3
- Direction
- lowere3
- Qualifier
- under high light (300 Rmol m-2 sec-1)e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Root growth under high light (300 Rmol m-2 sec-1) was significantly lower for P taeda seedlings grown in soil collected from beneath Myrica thickets”
Claim · model-written summary
Root and shoot growth of Pinus taeda in Myrica soil were significantly higher in the presence of Myrica leaf litter in high light.
- Taxon
- P taedaPinus taedae4
- Treatment
- Myrica leaf littere4
- Outcome
- root and shoot growthe4
- Direction
- highere4
- Qualifier
- in high lighte4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Both root and shoot growth of P taeda in Myrica soil were significantly higher in the presence of Myrica leaf litter in high light”
Claim · model-written summary
Litter accumulation may help Pinus taeda invade Myrica thicket gaps by counteracting allelopathic effects of Myrica root exudate.
- Taxon
- P taedaPinus taedae5
- Treatment
- litter accumulatione5
- Outcome
- invading Myrica thicket gapse5
- Qualifier
- counteracting allelopathic effects of Myrica root exudatee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Thus, litter accumulation may assist P taeda in invading Myrica thicket gaps, possibly by counteracting allelopathic effects of Myrica root exudate”
Claim · model-written summary
Low light and allelopathic effects may interact to sustain Myrica thickets by limiting root growth of invading Pinus taeda seedlings.
- Treatment
- Low light levels and allelopathic effectse6
- Outcome
- persistence of Myrica thicketse6
- Qualifier
- limiting root growth of invading P taeda seedlingse6
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MyricaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
female.JPG?width=500)
Verbatim
e6“Low light levels and allelopathic effects may interact and contribute to the persistence of Myrica thickets limiting root growth of invading P taeda seedlings”
The same questions in other papers
light · growth · Pinus taeda (loblolly pine)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.