Abstract
We studied the effects of different soil P status (P-deficient, P-poor and P-rich fen soils) on growth, root allocation and P and N-uptake of Carex species from fens differing in P-availability. We carried out a 3-month pot experiment where the three species were grown in each soil. Carex acutiformis, a species from eutrophic fens, showed the highest production under all soil conditions and changes in biomass allocation to belowground parts, but not in specific root length (SRL) or root length/leaf area ratio (RLLA) in response to changes in the P-soil status. Carex lasiocarpa Ehrh., a species from P-limited areas, showed intermediate biomass production and low inherent root weight ratio (RWR). Carex diandra Schrank., a species from areas where the growth of the vegetation is limited by nitrogen, showed low biomass production in all three fen soils studied, and no changes in its high specific root length (SRL) or root weight ratio (RWR) with soil phosphorus status. All three Carex species showed the best growth under P-poor conditions and a very reduced growth on the P-limited soil. Phosphorus uptake by Carex species was affected by P-soil status being lowest under P-deficient conditions for all three Carex species. P-soil status also affected N-uptake which was lower under P-deficient conditions than in the other two soils. It can be concluded that the success of both small Carex species in nutrient poor sites cannot be explained by higher relative growth rate, biomass production or nutrient uptake than the species from eutrophic areas. Other factors (water and soil chemistry other than N and P richness, presence of a bryophyte layer, establishment of seedlings, clonal reproduction, competition ability) must play a role in determining the distinct distribution pattern of these species.
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Claims 12
Claim · model-written summary
Carex acutiformis had the highest production in all soils.
- Taxon
- Carex acutiformis
Carex acutiformise0 - Outcome
- productione0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carex acutiformis, a species from eutrophic fens, showed the highest production under all soil conditions”
Claim · model-written summary
Carex acutiformis changed belowground biomass allocation with soil P status.
- Taxon
- Carex acutiformisCarex acutiformise2
- Outcome
- biomass allocation to belowground partse0
- Setting
- P-soil statuse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes in biomass allocation to belowground parts, but not in specific root length (SRL) or root length/leaf area ratio (RLLA) in response to changes in the P-soil status”
e2“Carex acutiformis”
Claim · model-written summary
Carex acutiformis specific root length and root length to leaf area ratio did not change with P status.
- Taxon
- Carex acutiformisCarex acutiformise2
- Outcome
- specific root length (SRL) or root length/leaf area ratio (RLLA)e0
- Direction
- note0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not in specific root length (SRL) or root length/leaf area ratio (RLLA) in response to changes in the P-soil status”
e2“Carex acutiformis”
Claim · model-written summary
Carex lasiocarpa had intermediate biomass production.
- Taxon
- Carex lasiocarpa Ehrh.
Carex lasiocarpae0 - Outcome
- biomass productione0
- Direction
- intermediatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carex lasiocarpa Ehrh., a species from P-limited areas, showed intermediate biomass production”
Claim · model-written summary
Carex lasiocarpa had low inherent root weight ratio.
- Taxon
- Carex lasiocarpa Ehrh.Carex lasiocarpae2
- Outcome
- root weight ratio (RWR)e0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low inherent root weight ratio (RWR)”
e2“Carex lasiocarpa Ehrh.”
Claim · model-written summary
Carex diandra had low biomass production in all three fen soils.
- Taxon
- Carex diandra Schrank.
Carex diandrae0 - Outcome
- biomass productione0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Carex diandra Schrank., a species from areas where the growth of the vegetation is limited by nitrogen, showed low biomass production in all three fen soils studied”
Claim · model-written summary
Carex diandra specific root length and root weight ratio did not change with P status.
- Taxon
- Carex diandra Schrank.Carex diandrae1
- Outcome
- specific root length (SRL) or root weight ratio (RWR)e0
- Direction
- no changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no changes in its high specific root length (SRL) or root weight ratio (RWR) with soil phosphorus status”
e1“Carex diandra Schrank.”
Claim · model-written summary
All three Carex species grew best under P-poor conditions.
CarexOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All three Carex species showed the best growth under P-poor conditions”
Claim · model-written summary
All three Carex species had very reduced growth on P-limited soil.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a very reduced growth on the P-limited soil”
t0“Effects of soil P status on growth and P and N uptake ofCarexspecies from fens differing in P-availability”
Claim · model-written summary
Carex phosphorus uptake was lowest under P-deficient conditions.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus uptake by Carex species was affected by P-soil status being lowest under P-deficient conditions for all three Carex species.”
Claim · model-written summary
Carex nitrogen uptake was lower in P-deficient soil than the other two soils.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N-uptake which was lower under P-deficient conditions than in the other two soils”
t0“Effects of soil P status on growth and P and N uptake ofCarexspecies from fens differing in P-availability”
Claim · model-written summary
The authors conclude that the small Carex species success in nutrient poor sites is not explained by superior growth or nutrient uptake.
- Outcome
- success of both small Carex species in nutrient poor sitese0
- Qualifier
- cannot be explained by higher relative growth rate, biomass production or nutrient uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the success of both small Carex species in nutrient poor sites cannot be explained by higher relative growth rate, biomass production or nutrient uptake than the species from eutrophic areas”
t0“Effects of soil P status on growth and P and N uptake ofCarexspecies from fens differing in P-availability”