Abstract
Water use efficiency (WUE) is a key index to predict the impact of climate change on ecosystem carbon and water cycles; the tradeoff of stem and leaf traits determine the WUE and resource competitiveness of individual plants. Four altitudinal gradients of 3400 m, 3500 m, 3600 m, and 3700 m were selected as experimental sites in Gahai Wetland on the Ruoerge Plateau. The Mantel Test method and the standardized major axis estimation (SMA) method were employed to examine the relationship between stem-leaf tradeoff and WUE of Kobresia tibetica in alpine peat swamps at different elevations. The results showed that with the increase of altitude, the surface water area decreased gradually, and the height and fractional vegetation cover of wetland community, stomatal conductance (Gs), and transpiration rate (Tr) of Kobresia tibetica showed a decreasing trend (P < 0.05).WUE, photosynthetically active radiation (PAR), vapor pressure deficit (VPD), and the height, fractional vegetation cover, and root-shoot ratio of Kobresia tibetica showed an increasing trend (P < 0.05). The leaf area (LA), leaf thickness (LT), specific leaf area (SLA), stem length (SL), and WUE of Kobresia Tibetica showed different correlations at different elevations. With the increase of altitude, the tradeoff between stems and leaves of Kobresia tibetica changed from stems to leaves, the tradeoff between LA and LT changed from favoring LA to LT, stem and leaf configuration changed from long stem-large LA to short stem-small LA, the net photosynthetic rate (Pn) and WUE increased, and the structural cost and photosynthetic efficiency return of Kobresia tibetica leaves changed from 'high-input-slow return' to 'low-input-fast return'. It reflects the ecological strategy of synergistic adaptation between stem and leaf morphology and photosynthetic characteristics of plants in alpine peat swamp in a heterogeneous habitat.
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Claims 12
Claim · model-written summary
Surface water area decreased with altitude.
Not reportedTaxonSetting
Verbatim
e0“with the increase of altitude, the surface water area decreased gradually”
Claim · model-written summary
Wetland community height and vegetation cover decreased with altitude.
Not reportedSetting
Verbatim
e0“the height and fractional vegetation cover of wetland community, stomatal conductance (Gs), and transpiration rate (Tr) of Kobresia tibetica showed a decreasing trend (P < 0.05)”
Claim · model-written summary
Kobresia tibetica stomatal conductance and transpiration decreased with altitude.
- Taxon
- Kobresia tibeticaCarex tibetikobresiae0
- Outcome
- stomatal conductance (Gs), and transpiration rate (Tr)e0
- Direction
- decreasing trende0
Not reportedSetting
Verbatim
e0“stomatal conductance (Gs), and transpiration rate (Tr) of Kobresia tibetica showed a decreasing trend (P < 0.05)”
Claim · model-written summary
Kobresia tibetica water use efficiency increased with altitude.
- Taxon
- Kobresia tibeticaCarex tibetikobresiae0
- Outcome
- WUEe0
- Direction
- increasing trende0
Not reportedSetting
Verbatim
e0“WUE, photosynthetically active radiation (PAR), vapor pressure deficit (VPD), and the height, fractional vegetation cover, and root-shoot ratio of Kobresia tibetica showed an increasing trend (P < 0.05)”
Claim · model-written summary
Photosynthetically active radiation and vapor pressure deficit increased with altitude.
- Outcome
- photosynthetically active radiation (PAR), vapor pressure deficit (VPD)e0
- Direction
- increasing trende0
Not reportedTaxon
Verbatim
e0“WUE, photosynthetically active radiation (PAR), vapor pressure deficit (VPD), and the height, fractional vegetation cover, and root-shoot ratio of Kobresia tibetica showed an increasing trend (P < 0.05)”
Claim · model-written summary
Kobresia tibetica height, vegetation cover and root-shoot ratio increased with altitude.
- Taxon
- Kobresia tibeticaCarex tibetikobresiae0
- Outcome
- height, fractional vegetation cover, and root-shoot ratioe0
- Direction
- increasing trende0
Not reportedSetting
Verbatim
e0“the height, fractional vegetation cover, and root-shoot ratio of Kobresia tibetica showed an increasing trend (P < 0.05)”
Claim · model-written summary
Leaf and stem traits showed differing correlations with water use efficiency among elevations.
- Taxon
- Kobresia TibeticaCarex tibetikobresiae0
- Organ / stage
- leafe0
- Outcome
- different correlationse0
- Setting
- different elevationse0
Not reportedDirection
Verbatim
e0“The leaf area (LA), leaf thickness (LT), specific leaf area (SLA), stem length (SL), and WUE of Kobresia Tibetica showed different correlations at different elevations”
Claim · model-written summary
With increasing altitude, Kobresia tibetica shifted its stem-leaf tradeoff toward leaves.
- Taxon
- Kobresia tibeticaCarex tibetikobresiae0
- Outcome
- tradeoff between stems and leavese0
Not reportedDirection
Verbatim
e0“the tradeoff between stems and leaves of Kobresia tibetica changed from stems to leaves”
Claim · model-written summary
With increasing altitude, the leaf area-thickness tradeoff shifted toward thickness.
- Taxon
- Kobresia tibeticaCarex tibetikobresiat0
- Outcome
- tradeoff between LA and LTe0
Not reportedDirection
Verbatim
e0“the tradeoff between LA and LT changed from favoring LA to LT”
t0“Kobresia tibetica”
Claim · model-written summary
Stem and leaf configuration shifted from long stems and large leaves to short stems and small leaves.
- Taxon
- Kobresia tibeticaCarex tibetikobresiat0
- Outcome
- stem and leaf configuratione0
Not reportedDirection
Verbatim
e0“stem and leaf configuration changed from long stem-large LA to short stem-small LA”
t0“Kobresia tibetica”
Claim · model-written summary
Net photosynthetic rate increased with altitude.
- Taxon
- Kobresia tibeticaCarex tibetikobresiat0
- Outcome
- net photosynthetic rate (Pn)e0
- Direction
- increasede0
Not reportedSetting
Verbatim
e0“the net photosynthetic rate (Pn) and WUE increased”
t0“Kobresia tibetica”
Claim · model-written summary
Kobresia leaf structural cost and photosynthetic return shifted from high-input-slow-return to low-input-fast-return.
- Taxon
- Kobresia tibeticaCarex tibetikobresiae0
- Outcome
- structural cost and photosynthetic efficiency returne0
Not reportedDirection
Verbatim
e0“the structural cost and photosynthetic efficiency return of Kobresia tibetica leaves changed from 'high-input-slow return' to 'low-input-fast return'”