Claim · model-written summary
The root respiration increase was 7.4%.
- Taxon
- Norway spruce
Picea abiest0 - Outcome
- root respiratione0
- Direction
- increasee0
- Value
- 7.4 %e0
Verbatim
e0“This increase in root respiration was of the same order of magnitude (7.4 %) as the decrease in dry matter production by mycorrhizal plants (10.1 %).”
t0“Norway spruce”
Title
LUDGER ELTROP; HORST MARSCHNER New Phytologist 1996. doi:10.1111/j.1469-8137.1996.tb01915.x
Other claims from this paper (19)
- Intervention effect Mycorrhizal infection decreased seedling growth.
- Observation Mycorrhizal infection reached 55–71% of root tips.
- Observation Fungal biomass accounted for less than 3% of plant dry matter.
- Intervention effect Fungal biomass was significantly lower under nitrate than ammonium.
- Intervention effect Mycorrhizal plants had higher CO2 assimilation than nonmycorrhizal plants under both N sources.
- Intervention effect High light intensity increased CO2 assimilation.
- Intervention effect Mycorrhizae significantly increased intact root respiration under ammonium.
- Observation The respiratory quotient reached 49.3% at 30°C and low light.
- Observation The respiratory quotient fell to 11.7% at 10°C and high light.
- Intervention effect Under ammonium, the proportion of carbon lost to root respiration was significantly higher in mycorrhizal plants.
- Intervention effect Dry matter production in mycorrhizal plants decreased 10.1%.
- Intervention effect Under nitrate, mycorrhizal and nonmycorrhizal plants had no significant respiratory quotient difference.
- Observation Fungal mycelium respiration accounted for 31.3% of total mycorrhizal root respiration with ammonium.
- Observation Fungal mycelium respiration accounted for 8.3% of total mycorrhizal root respiration with nitrate.
- Observation Fungal dry weight was 4% under ammonium.
- Observation Fungal dry weight was 2.5% under nitrate.
- Observation Calculated fungal respiration was 11.1 times root tissue respiration under ammonium.
- Observation Calculated fungal respiration was 3.4 times root tissue respiration under nitrate.
- Observation Carbohydrate concentrations did not consistently differ between mycorrhizal and nonmycorrhizal plants; increased root respiration was interpreted as the main cause of reduced growth, with extramatrical fungal biomass minor.