Abstract
The effect of soil changes caused by red alder (Alnusrubra Bong.) on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings was determined by comparing two adjacent plots of seedlings planted on former Douglas-fir and red alder sites. The seedlings grown on the former red alder site showed a 65% biomass increase in current twigs, 41% increase in older twigs, and 45% increase in stems. Foliage and roots were not significantly affected. The seedlings also developed shallower but wider root systems than those on the site formerly occupied by Douglas-fir. The seedlings on the red alder site showed an increase in N and decrease in P, Ca, and Mg concentrations. There were also higher N/P and N/K ratios and lower availability of soil P. Accelerated depletion of extractable P in soil was observed. Nutritional differences and biomass changes in seedlings can be attributed in part to the N and organic matter accumulated in the soil by the former red alder forest.
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Claims 12
Claim · model-written summary
Seedlings on the former red alder site showed a 65% biomass increase in current twigs compared with former Douglas-fir sites.
- Taxon
- Douglas-fir
Pseudotsuga menziesiie0 - Organ / stage
- current twigse1
- Treatment
- former red alder sitee1
- Outcome
- biomasse1
- Direction
- increasee1
- Value
- 65%e1
- Comparator
- former Douglas-fire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e1“The seedlings grown on the former red alder site showed a 65% biomass increase in current twigs, 41% increase in older twigs, and 45% increase in stems”
e2“comparing two adjacent plots of seedlings planted on former Douglas-fir and red alder sites”
Claim · model-written summary
Seedlings on the former red alder site showed a 41% biomass increase in older twigs compared with former Douglas-fir sites.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Organ / stage
- older twigse1
- Treatment
- former red alder sitee1
- Outcome
- biomasse1
- Direction
- increasee1
- Value
- 41%e1
- Comparator
- former Douglas-fire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e1“The seedlings grown on the former red alder site showed a 65% biomass increase in current twigs, 41% increase in older twigs, and 45% increase in stems”
e2“comparing two adjacent plots of seedlings planted on former Douglas-fir and red alder sites”
Claim · model-written summary
Seedlings on the former red alder site showed a 45% biomass increase in stems compared with former Douglas-fir sites.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Organ / stage
- stemse1
- Treatment
- former red alder sitee1
- Outcome
- biomasse1
- Direction
- increasee1
- Value
- 45%e1
- Comparator
- former Douglas-fire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e1“The seedlings grown on the former red alder site showed a 65% biomass increase in current twigs, 41% increase in older twigs, and 45% increase in stems”
e2“comparing two adjacent plots of seedlings planted on former Douglas-fir and red alder sites”
Claim · model-written summary
Foliage and roots were not significantly affected by the former red alder site.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- former red alder sitee1
- Outcome
- Foliage and rootse4
- Direction
- not significantly affectede4
- Comparator
- former Douglas-fire2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e1“The seedlings grown on the former red alder site showed a 65% biomass increase in current twigs, 41% increase in older twigs, and 45% increase in stems”
e2“comparing two adjacent plots of seedlings planted on former Douglas-fir and red alder sites”
e4“Foliage and roots were not significantly affected”
Claim · model-written summary
Seedlings developed shallower root systems than on the site formerly occupied by Douglas-fir.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- root systemse5
- Direction
- shallowere5
- Comparator
- the site formerly occupied by Douglas-fire5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e5“The seedlings also developed shallower but wider root systems than those on the site formerly occupied by Douglas-fir”
Claim · model-written summary
Seedlings developed wider root systems than on the site formerly occupied by Douglas-fir.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- root systemse5
- Direction
- widere5
- Comparator
- the site formerly occupied by Douglas-fire5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e5“The seedlings also developed shallower but wider root systems than those on the site formerly occupied by Douglas-fir”
Claim · model-written summary
Seedlings on the red alder site showed an increase in N concentration.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- Ne6
- Direction
- increasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e6“The seedlings on the red alder site showed an increase in N and decrease in P, Ca, and Mg concentrations”
Claim · model-written summary
Seedlings on the red alder site showed a decrease in P, Ca and Mg concentrations.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- P, Ca, and Mg concentrationse6
- Direction
- decreasee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e6“The seedlings on the red alder site showed an increase in N and decrease in P, Ca, and Mg concentrations”
Claim · model-written summary
Seedlings on the red alder site had higher N/P and N/K ratios.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- N/P and N/K ratiose7
- Direction
- highere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e7“There were also higher N/P and N/K ratios and lower availability of soil P”
Claim · model-written summary
Soil on the former red alder site had lower availability of soil P.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- availability of soil Pe7
- Direction
- lowere7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e7“There were also higher N/P and N/K ratios and lower availability of soil P”
Claim · model-written summary
Extractable P in soil was depleted at an accelerated rate on the former red alder site.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- depletion of extractable P in soile2
- Direction
- Acceleratede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e2“Accelerated depletion of extractable P in soil was observed”
Claim · model-written summary
Nutritional differences and biomass changes in seedlings are attributed in part to N and organic matter accumulated in the soil by the former red alder forest.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- biomass changese2
- Qualifier
- the N and organic matter accumulated in the soile2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on the biomass and nutrition of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) seedlings”
e2“Nutritional differences and biomass changes in seedlings can be attributed in part to the N and organic matter accumulated in the soil by the former red alder forest”
The same questions in other papers
climate site · growth · Pseudotsuga menziesii (Douglas-fir)Results agree
1 paper in the same direction as this paper
- positive
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.