Abstract
Abstract An experiment was carried out to examine the growth of rimu ( Dacrydium cupressinum Lamb.), kahikatea (Dacrycarpus dacrydioides (A. Rich.) DeLaub.), and totara ( Podocarpus totara G. Benn. ex Don) at six levels of nutrient supply. The aim of this study was to identify species differences in growth response to nutrition. The nutrient treatments consisted of six, balanced nutrient solutions in which all macronutrients remained in constant proportion, but absolute levels varied. The solutions, referred to by their N concentration, ranged from a treatment nearly devoid of nutrients (10 ppm N) to one equivalent to rich potting soil (600 ppm N). Significant growth responses to nutrition occurred in all species. Nutrient treatment significantly affected net photosynthetic rate and allocation of carbon to leaves. All three species achieved maximum growth in the most nutrient‐rich treatment (600 ppm N). In the lowest nutrient treatment (10 ppm N), the growth of all three species was very slow, and there were only small differences between species. With increasing nutrient supply, totara and kahikatea responded more rapidly than rimu. However, rimu absorbed more N and P per unit of root weight, and also contained a higher whole‐plant concentration of these elements. It is suggested that those attributes enable rimu to compete on infertile sites.
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Claims 10
Claim · model-written summary
All three species had significant growth responses to nutrition.
Verbatim
e0“Significant growth responses to nutrition occurred in all species.”
Claim · model-written summary
Nutrient treatment significantly affected net photosynthetic rate.
Not reportedComparatorDirection
Verbatim
e0“Nutrient treatment significantly affected net photosynthetic rate and allocation of carbon to leaves.”
t0“growth of rimu”
Claim · model-written summary
Nutrient treatment significantly affected carbon allocation to leaves.
Not reportedComparatorDirection
Verbatim
e0“Nutrient treatment significantly affected net photosynthetic rate and allocation of carbon to leaves.”
t0“growth of rimu”
Claim · model-written summary
All three species reached maximum growth at 600 ppm N.
- Taxon
- All three speciese0
- Treatment
- most nutrient‐rich treatment (600 ppm N)e0
- Outcome
- growthe0
- Direction
- maximume0
- Value
- 600 ppm Ne0
Not reportedComparator
Verbatim
e0“All three species achieved maximum growth in the most nutrient‐rich treatment (600 ppm N).”
Claim · model-written summary
All three species grew very slowly at 10 ppm N.
- Taxon
- all three speciese0
- Treatment
- lowest nutrient treatment (10 ppm N)e0
- Outcome
- growthe0
- Direction
- very slowe0
- Value
- 10 ppm Ne0
Not reportedComparator
Verbatim
e0“In the lowest nutrient treatment (10 ppm N), the growth of all three species was very slow, and there were only small differences between species.”
Claim · model-written summary
Species growth differed only slightly at the lowest nutrient supply.
Verbatim
e0“In the lowest nutrient treatment (10 ppm N), the growth of all three species was very slow, and there were only small differences between species.”
Claim · model-written summary
Totara and kahikatea responded more rapidly to increasing nutrient supply than rimu.
Verbatim
e0“With increasing nutrient supply, totara and kahikatea responded more rapidly than rimu.”
Claim · model-written summary
Rimu absorbed more N and P per unit root weight.
Not reportedComparator
Verbatim
e0“However, rimu absorbed more N and P per unit of root weight, and also contained a higher whole‐plant concentration of these elements.”
Claim · model-written summary
Rimu had higher whole-plant N and P concentration.
Verbatim
e0“However, rimu absorbed more N and P per unit of root weight, and also contained a higher whole‐plant concentration of these elements.”
Claim · model-written summary
The authors suggest these nutrient traits help rimu compete on infertile sites.
Verbatim
e0“It is suggested that those attributes enable rimu to compete on infertile sites.”