Nutrient enrichment changes water transport structures of savanna woody plants
| Autor: | Clapton Olimpio De Moura, Mercedes M. C. Bustamante, Lucas Silva Costa, Sandra Janet Bucci, Sueli Maria Gomes, Julia Sonsin-Oliveira |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Water transport
VULNERABILITY TO CAVITATION Renewable Energy Sustainability and the Environment WATER RELATIONS Public Health Environmental and Occupational Health FERTIIZATION EFFECTS WATER USE purl.org/becyt/ford/1 [https] PLANT ANATOMICAL ADJUSTMENT Nutrient Agronomy Environmental science purl.org/becyt/ford/1.6 [https] Water use General Environmental Science Woody plant SAPWOOD HYDRAULIC CONDUCTIVITY |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| DOI: | 10.1088/1748-9326/abe6c5 |
| Popis: | Brazilian savanna is a seasonally dry biome, highly diverse and distributed mainly on nutrient-limited soils. Interactions between water stress and nutrient availability are important evolutionary filters in these environments. Previous evidence indicated that reducing the nutritional limitation increases growth rate, optimizes water transport and decreases stomatal conductance in woody plants. However, the anatomical mechanisms that explain such responses are not well-understood. We studied the effects of long-term (20 years) nutrient addition (N, NP and P) on soil chemistry and hydraulic morphological and anatomical traits in six dominant woody savanna species. Nutrient addition and decrease in soil moisture, probably related to changes in grass cover, influenced the plant hydraulic traits at the anatomical level, namely increasing the xylem vessels’ diameter. Consequently, the specific theoretical xylem conductivity (Ktx) increased in five species under NP and P addition. Additionally, the stomatal pore index (SPI) decreased with species-specific responses regarding the intrinsic water use efficiency (iWUE). Four species had higher vulnerability to cavitation (lvul) under NP and P addition. Using community-weighted mean and structural equation modeling approaches, we observed that nutrient enrichment at the community level did not affect iWUE, while the vulnerability to cavitation (lvul) strongly increased. The Ktx and SPI were positively and negatively affected by nutrient addition, respectively, but the effects were not as strong as expected due to contrasting species responses. These changes optimized water transport with a hydraulic safety cost and reduced water loss. In comparison with responses to N addition, the greater P-limitation in Cerrado vegetation explains the inter-specific convergence in the responses of P-fertilized individuals. We showed that long-term responses to increased nutrient availability in dystrophic soils include anatomical changes in savanna woody vegetation with relevant interactions with soil-plant–atmosphere water relations. Fil: Silva Costa, Lucas. Universidade do Brasília; Brasil Fil: De Moura, Clapton Olimpio. Universidade do Brasília; Brasil Fil: Bucci, Sandra Janet. Universidad Nacional de la Patagonia "San Juan Bosco". Instituto de Biociencias de la Patagonia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Instituto de Biociencias de la Patagonia; Argentina Fil: Sonsin-Oliveira, Julia. Universidade do Brasília; Brasil Fil: Gomes, Sueli Maria. Universidade do Brasília; Brasil Fil: Da Cunha Bustamante, Mercedes Maria. Universidade do Brasília; Brasil |
| Databáze: | OpenAIRE |
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