Abstract
Predawn leaf water potential (LWP), the LWP between 09:00 and 10:30 h (termed minimum LWP), stem xylem hydraulic conductivity, foliar nitrogen, leaf gas exchange and leaf traits were measured on the same days in adults and 1-year-old to 7-year-old resprouts that had regrown after removing all the aboveground shoots. Height growth and accumulation of aboveground biomass quickly decreased with resprout age and there was no difference between 7-year-old resprouts and the uncut adults. Predawn LWP showed no significant difference between resprouts and adults, but the minimum LWP decreased gradually from -2.0 MPa in 1-year-old resprouts to -3.0 MPa in 7-year-old resprouts. The decrease in minimum LWP was associated with increased hydraulic resistance, as indicated by the gradual decrease in leaf area-specific hydraulic conductivity (KL) and sapwood area-specific hydraulic conductivity (KS) and the associated increase in stem native percentage loss of hydraulic conductivity in older than 2-year-old resprouts. The leaf nitrogen content per unit area (Narea) also decreased steadily from 3.6 g m(-2) in 1-year-old resprouts to 1.7 g m(-2) in 7-year-old resprouts. With the decline in LWP and Narea, the rate of leaf photosynthesis per unit area (Aarea) decreased from 20 μ mol m(-2) s(-1) in 1-year-old resprouts to 11 μ mol m(-2) s(-1) in 7-year-old resprouts. In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively. The results show that a progressive loss of stem hydraulic conductivity and a steady decrease in foliar nitrogen with age were associated with a decrease in the photosynthetic rate of Caragana korshinskii Kom. resprouts, possibly changing the allocation of photosynthetic assimilates and slowing resprout height growth.
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Claims 16
Claim · model-written summary
Height growth and aboveground biomass accumulation of resprouts quickly decreased with resprout age.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- Height growth and accumulation of aboveground biomasse0
- Direction
- decreasede0
- Qualifier
- with resprout agee0
Verbatim
t0“Caragana korshinskii”
e0“Height growth and accumulation of aboveground biomass quickly decreased with resprout age”
Claim · model-written summary
Height growth and aboveground biomass of 7-year-old resprouts did not differ from those of the uncut adults.
Verbatim
t0“Caragana korshinskii”
e0“Height growth and accumulation of aboveground biomass quickly decreased with resprout age and there was no difference between 7-year-old resprouts and the uncut adults”
Claim · model-written summary
Predawn leaf water potential showed no significant difference between resprouts and adults.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- Predawn LWPe0
- Comparator
- adultse0
Not reportedDirection
Verbatim
t0“Caragana korshinskii”
e0“Predawn LWP showed no significant difference between resprouts and adults”
Claim · model-written summary
Minimum leaf water potential decreased gradually from -2.0 MPa in 1-year-old resprouts to -3.0 MPa in 7-year-old resprouts.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- minimum LWPe0
- Direction
- decreasede0
- Value
- -2.0 MPa in 1-year-old resprouts to -3.0 MPae0
Verbatim
t0“Caragana korshinskii”
e0“the minimum LWP decreased gradually from -2.0 MPa in 1-year-old resprouts to -3.0 MPa in 7-year-old resprouts”
Claim · model-written summary
The decrease in minimum leaf water potential was associated with increased hydraulic resistance.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- decrease in minimum LWPe0
- Qualifier
- associated with increased hydraulic resistancee0
Verbatim
t0“Caragana korshinskii”
e0“The decrease in minimum LWP was associated with increased hydraulic resistance”
Claim · model-written summary
Leaf area-specific and sapwood area-specific hydraulic conductivity decreased gradually with resprout age.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- leaf area-specific hydraulic conductivity (KL) and sapwood area-specific hydraulic conductivity (KS)e0
- Direction
- decreasee0
Verbatim
t0“Caragana korshinskii”
e0“the gradual decrease in leaf area-specific hydraulic conductivity (KL) and sapwood area-specific hydraulic conductivity (KS)”
Claim · model-written summary
Stem native percentage loss of hydraulic conductivity increased in resprouts older than 2 years.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- stem native percentage loss of hydraulic conductivitye0
- Direction
- increasee0
- Qualifier
- older than 2-year-old resproutse0
Verbatim
t0“Caragana korshinskii”
e0“the associated increase in stem native percentage loss of hydraulic conductivity in older than 2-year-old resprouts”
Claim · model-written summary
Leaf nitrogen content per unit area decreased steadily from 3.6 g m(-2) in 1-year-old resprouts to 1.7 g m(-2) in 7-year-old resprouts.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- leaf nitrogen content per unit area (Narea)e0
- Direction
- decreasede0
- Value
- 3.6 g m(-2) in 1-year-old resprouts to 1.7 g m(-2)e0
Verbatim
t0“Caragana korshinskii”
e0“The leaf nitrogen content per unit area (Narea) also decreased steadily from 3.6 g m(-2) in 1-year-old resprouts to 1.7 g m(-2) in 7-year-old resprouts”
Claim · model-written summary
Leaf photosynthesis rate per unit area decreased from 20 to 11 umol m-2 s-1 between 1-year-old and 7-year-old resprouts.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- rate of leaf photosynthesis per unit area (Aarea)e0
- Direction
- decreasede0
- Value
- 20 μ mol m(-2) s(-1) in 1-year-old resprouts to 11 μ mol m(-2) s(-1)e0
Verbatim
t0“Caragana korshinskii”
e0“the rate of leaf photosynthesis per unit area (Aarea) decreased from 20 μ mol m(-2) s(-1) in 1-year-old resprouts to 11 μ mol m(-2) s(-1) in 7-year-old resprouts”
Claim · model-written summary
In adults, KS decreased further compared with 7-year-old resprouts.
Verbatim
t0“Caragana korshinskii”
e0“In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively”
Claim · model-written summary
In adults, minimum leaf water potential was 0.3 MPa higher than in 7-year-old resprouts.
Verbatim
t0“Caragana korshinskii”
e0“In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively”
Claim · model-written summary
In adults, leaf area-specific hydraulic conductivity (KL) was 29% higher than in 7-year-old resprouts.
Verbatim
t0“Caragana korshinskii”
e0“In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively”
Claim · model-written summary
In adults, leaf nitrogen content per unit area (Narea) was 34% higher than in 7-year-old resprouts.
Verbatim
t0“Caragana korshinskii”
e0“In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively”
Claim · model-written summary
In adults, the rate of photosynthesis was 23% higher than in 7-year-old resprouts.
Verbatim
t0“Caragana korshinskii”
e0“In adults, although KS decreased further compared with 7-year-old resprouts, the minimum LWP, KL, Narea and the rate of photosynthesis increased by 0.3 MPa, 29, 34 and 23%, respectively”
Claim · model-written summary
Progressive loss of stem hydraulic conductivity and steady decrease in foliar nitrogen with age were associated with a decrease in the photosynthetic rate of Caragana korshinskii resprouts.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- decrease in the photosynthetic ratee0
- Qualifier
- progressive loss of stem hydraulic conductivity and a steady decrease in foliar nitrogen with agee0
Verbatim
t0“Caragana korshinskii”
e0“a progressive loss of stem hydraulic conductivity and a steady decrease in foliar nitrogen with age were associated with a decrease in the photosynthetic rate”
Claim · model-written summary
The authors suggest the decline may change the allocation of photosynthetic assimilates and slow resprout height growth.
- Taxon
- Caragana korshinskiiCaragana korshinskiit0
- Outcome
- resprout height growthe0
- Qualifier
- possibly changing the allocation of photosynthetic assimilatese0
Verbatim
t0“Caragana korshinskii”
e0“possibly changing the allocation of photosynthetic assimilates and slowing resprout height growth”