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| DOI | 10.1016/j.plaphy.2024.108408 |
| Balancing trade-offs: Enhanced carbon assimilation and productivity with reduced nutritional value in a well-watered C4 pasture under a warmer CO2-enriched atmosphere | |
| 发表日期 | 2024 |
| ISSN | 0981-9428 |
| EISSN | 1873-2690 |
| 起始页码 | 207 |
| 卷号 | 207 |
| 英文摘要 | The concentration of atmospheric CO2 and temperature are pivotal components of ecosystem productivity, carbon balance, and food security. In this study, we investigated the impacts of a warmer climate (+2 degrees C above ambient temperature) and an atmosphere enriched with CO2 (600 ppm) on gas exchange, antioxidant enzymatic system, growth, nutritive value, and digestibility of a well-watered, managed pasture of Megathyrsus maximus, a tropical C-4 forage grass, under field conditions. Elevated [CO2] (eC) improved photosynthesis and reduced stomatal conductance, resulting in increased water use efficiency and plant C content. Under eC, stem biomass production increased without a corresponding increase in leaf biomass, leading to a smaller leaf/stem ratio. Additionally, eC had negative impacts on forage nutritive value and digestibility. Elevated temperature (eT) increased photosynthetic gains, as well as stem and leaf biomass production. However, it reduced P and K concentration, forage nutritive value, and digestibility. Under the combined conditions of eC and eT (eCeT), eT completely offset the effects of eC on the leaf/stem ratio. However, eT intensified the effects of eC on photosynthesis, leaf C concentration, biomass accumulation, and nutritive value. This resulted in a forage with 12% more acid detergent fiber content and 28% more lignin. Additionally, there was a decrease of 19% in crude protein leading to a 15% decrease in forage digestibility. These changes could potentially affect animal feeding efficiency and feedback climate change, as ruminants may experience an amplification in methane emissions. Our results highlight the critical significance of conducting multifactorial field studies when evaluating plant responses to climate change variables. |
| 英文关键词 | Carbon allocation; Climate change; Forage quality; Gas exchange; Megathyrsus maximus; Tropical pasture |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| WOS记录号 | WOS:001188389800001 |
| 来源期刊 | PLANT PHYSIOLOGY AND BIOCHEMISTRY
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/287141 |
| 作者单位 | Universidade de Sao Paulo; Universidade de Sao Paulo; Universidade Estadual Paulista; Universidade de Sao Paulo; Universidad de O'Higgins; New Zealand Institute for Plant & Food Research Ltd |
| 推荐引用方式 GB/T 7714 | . Balancing trade-offs: Enhanced carbon assimilation and productivity with reduced nutritional value in a well-watered C4 pasture under a warmer CO2-enriched atmosphere[J],2024,207. |
| APA | (2024).Balancing trade-offs: Enhanced carbon assimilation and productivity with reduced nutritional value in a well-watered C4 pasture under a warmer CO2-enriched atmosphere.PLANT PHYSIOLOGY AND BIOCHEMISTRY,207. |
| MLA | "Balancing trade-offs: Enhanced carbon assimilation and productivity with reduced nutritional value in a well-watered C4 pasture under a warmer CO2-enriched atmosphere".PLANT PHYSIOLOGY AND BIOCHEMISTRY 207(2024). |
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