Efeitos Das Mudanças Climáticas Em Plantas Cultivadas E Nativas: Atual Estado Das Pesquisas Brasileiras

J Agronomy Crop Science

et al. 2020

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Temperature and other abiotic factors, such water and nutrient availability, play an important role for plants in response to the changing environments. At this regard, both warming and drought might affect the nutrient use efficiency (NUE) and growth of Megathyrsus maximus a C4 forage grass of high interest for cattle feeding. However, the nutrient requirements of this species under climate change are unknown. Therefore, we aimed to evaluate the individual and combined effects of two levels of temperature: ambient and elevated temperature (2°C above ambient temperature), and two levels of soil water availability: irrigated plants and non‐irrigated plants on accumulation of leaf nutrients, NUE and biomass production of M. maximus. Temperature control was performed by a temperature free‐air‐controlled enhancement (T‐FACE) system under field conditions. In general, we observed that warming under well‐irrigated conditions increased the leaf accumulation of most nutrients, improving the NUE of N, P, K, Ca, Mg, Cu, Mn and Zn. Plant growth was also enhanced under warming effects, with higher leaf dry mass accumulation and root development. Meanwhile, drought decreased NUE of K, Ca, B and leaf dry biomass, while root growth was stimulated. The combined effects of warming and drought on nutrient accumulation, NUE and plant growth tended to be greater than the individual effects expected from a single factor; thus, warming mitigated the negative impacts of individual drought. In summary, our findings suggest that warming and drought, both as individual and combined factors, will change the nutrient requirements of M. maximus in tropical ecosystems.

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Section: Introductionmentioning

confidence: 99%

Water stress and warming impact nutrient use efficiency of Mombasa grass (Megathyrsus maximus) in tropical conditions

J Agronomy Crop Science

et al. 2020

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“…A warmer atmosphere brings many other consequences to regional and global climate patterns such as changes in rainfall distribution and intensity (Tietjen et al, 2017). Moreover, climate change involves simultaneous modi cations in complexes set of climate variables that interact to each other (e.g., temperature, water availability, atmospheric CO 2 levels), potentially affecting crop productivity and causing yield losses (Habermann et al, 2020;Olivera-Viciedo et al, 2019, 2021aOrtiz-Bobea et al, 2021). Therefore, countries that are highly dependent on agriculture as the major economic activity are the most vulnerable to climate change, creating an urgent need for studies to understand how these regions will be impacted by climatic changes.…”

Section: Introductionmentioning

confidence: 99%

Are the interaction effects of warming and drought on nutritional status and biomass production in a tropical forage legume greater than their individual effects?

et al. 2021

Preprint

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Climate change effects on natural and managed ecosystems are difficult to predict due to its multi-factor nature. However, most studies which investigate the impacts of climate change factors on plants, such as warming or drought, were conducted under one single stress and controlled environments. In this study, we evaluated the effects of elevated temperature (+ 2°C) (T) under different conditions of soil water availability (W) to understand the interactive effects of both factors on leaf, stem, and inflorescence macro and micronutrients concentration and biomass allocation of a tropical forage species, Stylosanthes capitata Vogel under field conditions. Temperature control was performed by a Temperature Free-Air Controlled Enhancement (T‐FACE) system. We observed that warming changed nutrient concentrations and plant growth depending on soil moisture levels, but the responses were specific for each plant-organ. In general, we observed that warming under well-watered conditions greatly improved nutrient concentration and biomass production, whilst the opposite effect was observed under non-irrigated and non-warmed conditions. However, under warmed and non-irrigated conditions, we observed that leaf biomass and leaf nutrient concentration greatly reduced when compared to non-warmed and irrigated plants. Our findings suggest that warming (2°C above ambient temperature) and drought, as well as both combined stresses, will change the nutrient requirements and biomass distributions between plant aerial organs of S. capitata in tropical ecosystems, which may impact animal feeding in the future.

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Are the interaction effects of warming and drought on nutritional status and biomass production in a tropical forage legume greater than their individual effects?

et al. 2021

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