Abstract
S ummary Roots were examined from three‐year‐old Scots pine seedlings (Pinus sylvestris L.) growing on a humo‐ferric podzol in monolith soil lysimeters which had received simulated acid rain at pH 3 or non‐acidified rain. This is about 30 times the rate of wet H + deposition at the site from which the lysimeters were taken. Root biomass was similar between treatments, but acid‐treated root systems showed significantly reduced fine root branching compared to the controls. The reduced branching of acid‐treated root systems was attributed to a significant reduction in the occurrence of two corralloid mycorrhizal morphs. The coralloid mycorrhizas were characterized by profuse extramatrical hyphal development, the growth of which was retarded by soil conditions in the acid‐treated lysimeters. Soil solution measurements showed the major effects of the acid treatment to be increases in concentrations of H + , Ca 2+ , A1 and SO 4 2− . It seems likely that an increase in Al and reduction of pH had affected the growth of these mycorrhizas. This may have nutritional consequences for trees on acidic soil.
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Claims 5
Claim · model-written summary
Acid rain at pH 3 significantly reduced fine root branching in Scots pine seedlings compared with non-acidified rain.
- Taxon
- Scots pine
Pinus sylvestrise1 - Organ / stage
- root systemse3
- Treatment
- simulated acid rain at pH 3e2
- Outcome
- fine root branchinge3
- Direction
- reducede3
- Comparator
- non‐acidified raine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“three‐year‐old Scots pine seedlings (Pinus sylvestris L.)”
e2“which had received simulated acid rain at pH 3 or non‐acidified rain”
e3“acid‐treated root systems showed significantly reduced fine root branching compared to the controls”
Claim · model-written summary
Acid rain at pH 3 significantly reduced the occurrence of two coralloid mycorrhizal morphs on Scots pine roots.
- Taxon
- Scots pinePinus sylvestrise1
- Treatment
- simulated acid rain at pH 3e2
- Interactor
- corralloid mycorrhizal morphse4symbiont
- Outcome
- occurrence of two corralloid mycorrhizal morphse4
- Direction
- reductione4
- Comparator
- non‐acidified raine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“three‐year‐old Scots pine seedlings (Pinus sylvestris L.)”
e2“which had received simulated acid rain at pH 3 or non‐acidified rain”
e4“The reduced branching of acid‐treated root systems was attributed to a significant reduction in the occurrence of two corralloid mycorrhizal morphs”
Claim · model-written summary
Root biomass of Scots pine seedlings was similar under acid rain and non-acidified rain.
- Taxon
- Scots pinePinus sylvestrise1
- Treatment
- simulated acid rain at pH 3e2
- Outcome
- Root biomasse5
- Direction
- similare5
- Comparator
- non‐acidified raine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“three‐year‐old Scots pine seedlings (Pinus sylvestris L.)”
e2“which had received simulated acid rain at pH 3 or non‐acidified rain”
e5“Root biomass was similar between treatments”
Claim · model-written summary
Growth of coralloid mycorrhizas was retarded by soil conditions in the acid-treated lysimeters.
- Taxon
- Scots pinePinus sylvestrise1
- Treatment
- soil conditions in the acid‐treated lysimeterse6
- Interactor
- coralloid mycorrhizase6symbiont
- Outcome
- growthe6
- Direction
- retardede6
- Comparator
- non‐acidified raine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“three‐year‐old Scots pine seedlings (Pinus sylvestris L.)”
e2“which had received simulated acid rain at pH 3 or non‐acidified rain”
e6“The coralloid mycorrhizas were characterized by profuse extramatrical hyphal development, the growth of which was retarded by soil conditions in the acid‐treated lysimeters”
Claim · model-written summary
Acid treatment increased soil solution concentrations of H+, Ca2+, Al and SO4 2- in the lysimeters.
- Taxon
- Scots pinePinus sylvestrise1
- Treatment
- acid treatmente7
- Outcome
- concentrations of H + , Ca 2+ , A1 and SO 4 2−e7
- Direction
- increasese7
- Comparator
- non‐acidified raine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“three‐year‐old Scots pine seedlings (Pinus sylvestris L.)”
e2“which had received simulated acid rain at pH 3 or non‐acidified rain”
e7“Soil solution measurements showed the major effects of the acid treatment to be increases in concentrations of H + , Ca 2+ , A1 and SO 4 2−”
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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.