ArticleScientific reports2025
Trade-off strategies between drought resistance and growth rate of dominant tree species in karst forests within heterogeneous habitats.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Signaling by a tyrosine-sulfated peptide balances growth and osmotic stress response in rice.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Drought Resistance Evaluation ofPlants (Basel, Switzerland) · 2025Article
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11 authors.
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Abstract
This study investigates drought resistance-growth trade-offs in dominant tree species across elevationally stratified habitats (depression, middle slope, hilltop) of Nonggang karst seasonal rainforest in southwestern China. Analysis of 38 species along a 190-meter aridity gradient reveals drought resistance enhancement through foliar modifications: 56.79% increase in cuticle thickness, 56.42% denser palisade mesophyll thickness, and 36.48% expansion in spongy mesophyll thickness, accompanied by 45.67% growth reduction. Structural equation modeling confirms a significant drought resistance-growth trade-off (β = - 0.504), indicating carbon allocation constraints. Hilltop species employ an anisohydric strategy combining stomatal optimization (4.45% shorter length, 27.17% wider apertures achieving 33.10% increased opening) with 15.52% reduced upper epidermis cell width and cuticle thickening, enhancing hydraulic efficiency despite 111.63% elevated dark respiration rates. This high-resistance/low-growth strategy contrasts with depression-adapted species showing superior low-light performance: 30.35% higher quantum yield and 63.44% lower light compensation points compared to hilltop counterparts. Environmental driver analysis identifies soil moisture (β = - 0.706) and bedrock exposure (β = - 0.594) as key factors shaping trait divergence. Drought suppresses growth through dual pathways: direct resource limitation (β = - 0.667) and indirect metabolic costs of resistance traits (β = - 0.469). Coordinated leaf trait evolution reduces niche overlap via drought-growth trade-offs, establishing habitat filtration-mediated biodiversity maintenance in karst ecosystems. These results provide a multidimensional framework for balancing stress resistance and productivity in tropical karst vegetation restoration.
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