Abstract
Distylium chinense is an evergreen dominant shrub with strong adaptability under heterogeneous habitats, including natural riparian zone (NRZ), anti-seasonal water level fluctuation zone (ASWLFZ), and no water level fluctuation zone (NWLFZ) in the Three Gorges Reservoir Region (TGRR) in China. In order to understand the photosynthetic ecological adaptability and habitat adaptation strategies of D. chinense under heterogeneous habitats, its photosynthesis and chlorophyll fluorescence parameters were investigated. The results showed that photosynthetic characteristics were significantly different among heterogeneous habitats (p<0.05). The PSII potential activity and PSII maximum photochemical efficiency (Fv/Fm) of D. chinense in the ASWLFZ were the highest among heterogeneous habitats. Non-photochemical quenching coefficient (qN) in the NWLFZ was higher than that in the NRZ and ASWLFZ (p<0.05). Stepwise regression analysis showed that water use efficiency and stomatal conductance were correlated with specific leaf area (SLA), leaf area and leaf dry weight. Regression curve fitting and canonical correspondence analysis revealed that light intensity, soil water content, air humidity and temperature were the main factors affecting photosynthetic characteristics and leaf functional traits. Our results evidenced that D. chinense adapted to the high water content and low light intensity environments, especially in the valley waterfall habitats, by increasing stomatal conductance and net photosynthetic rate, reducing SLA and maintaining moderate qN and Fv/Fm with adopting a profligate water use pattern to improve photosynthetic productivity. Therefore, D. chinense has a wide photosynthetic acclimation to different environments, which provided baseline information for the conservation and ecological restoration in the newly formed hydro-fluctuation zone and other similar degenerative riparian ecosystem.
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Claims 8
Claim · model-written summary
Photosynthetic characteristics of D. chinense differed significantly among habitats.
- Taxon
- Distylium chinenseDistylium chinenset0
- Outcome
- photosynthetic characteristicse0
- Setting
- heterogeneous habitatse0
Verbatim
e0“photosynthetic characteristics were significantly different among heterogeneous habitats (p<0.05)”
t0“Distylium chinense”
Claim · model-written summary
PSII potential activity and maximum photochemical efficiency were highest in the fluctuating water level zone.
Verbatim
e0“The PSII potential activity and PSII maximum photochemical efficiency (Fv/Fm) of D. chinense in the ASWLFZ were the highest among heterogeneous habitats.”
Claim · model-written summary
Non-photochemical quenching was higher in NWLFZ than in NRZ and ASWLFZ.
Verbatim
e0“Non-photochemical quenching coefficient (qN) in the NWLFZ was higher than that in the NRZ and ASWLFZ (p<0.05).”
t0“Distylium chinense”
Claim · model-written summary
Water use efficiency and stomatal conductance correlated with specific leaf area, leaf area and leaf dry weight.
Verbatim
e0“water use efficiency and stomatal conductance were correlated with specific leaf area (SLA), leaf area and leaf dry weight”
t0“Distylium chinense”
Claim · model-written summary
Light intensity, soil water content, air humidity and temperature were identified as main factors affecting photosynthetic traits.
- Taxon
- Distylium chinenseDistylium chinenset0
- Outcome
- photosynthetic characteristics and leaf functional traitse0
- Setting
- light intensity, soil water content, air humidity and temperaturee0
Not reportedDirection
Verbatim
e0“light intensity, soil water content, air humidity and temperature were the main factors affecting photosynthetic characteristics and leaf functional traits”
t0“Distylium chinense”
Claim · model-written summary
In high water and low light environments, D. chinense increased stomatal conductance and net photosynthetic rate and reduced specific leaf area.
Verbatim
e0“D. chinense adapted to the high water content and low light intensity environments, especially in the valley waterfall habitats, by increasing stomatal conductance and net photosynthetic rate, reducing SLA”
Claim · model-written summary
D. chinense reduced specific leaf area in high water and low light environments.
- Taxon
- D. chinenseDistylium chinensee0
- Outcome
- SLAe0
- Direction
- reducinge0
- Qualifier
- high water content and low light intensity environmentse0
Verbatim
e0“D. chinense adapted to the high water content and low light intensity environments, especially in the valley waterfall habitats, by increasing stomatal conductance and net photosynthetic rate, reducing SLA”
Claim · model-written summary
D. chinense maintained moderate qN and Fv/Fm while using water profligately in high water and low light habitats.
- Taxon
- D. chinenseDistylium chinensee1
- Outcome
- qN and Fv/Fme0
- Direction
- maintaining moderatee0
- Qualifier
- profligate water use patterne0
Verbatim
e0“maintaining moderate qN and Fv/Fm with adopting a profligate water use pattern to improve photosynthetic productivity”
e1“D. chinense adapted to the high water content and low light intensity environments”