期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 759, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.143505
关键词
Climate change; Forage species; Legume; Photosynthesis; Stomatal conductance; Tropical climate; Warming
资金
- Sao Paulo Research Foundation (FAPESP), Thematic Project [2008/58075-8]
- Brazilian National Council for Scientific and Technological Development (CNPq)
- National Agency Water (ANA)
- Ministry of Science, Technology and Innovation (MCTI) [446357/2015-4]
- FAPESP [2016/09742-8, 2016/12853-6]
- CNPq [155285/2018-1]
Experimental study found that tropical pastures have different adaptability to warming under different soil moisture conditions, and may lead to a decrease in nutritional value and digestibility of livestock feed. Under irrigation conditions, tropical pastures have potential physiological acclimation to warming.
Tropical pastures play a significant role in the global carbon cycle and are crucial for world livestock production. Despite its importance, there is a paucity of field studies that clarify how tropical pasture species will be affected by environmental changes predicted for tropical regions. Using a temperature-free air-controlled enhancement (T-FACE) system, we increased canopy temperature (+2 degrees C over ambient) and evaluated the effects of warming under two soil moisture conditions in a factorial design over the physiology, forage production, and forage quality of a tropical forage legume, Stylosanthes capitata. Under well-watered conditions, warming increased the PSII efficiency, net photosynthesis, and aboveground biomass accumulation, but reduced forage quality and digestibility by decreasing crude protein content and increasing lignin content. Non-irrigated conditions under ambient temperature reduced leaf water status presumably promoting the reduction in net photosynthesis, forage production, and forage quality and digestibility. Under the combination of canopy warming and non-irrigated conditions, warming mitigated the effects of reduced soil moisture on leaf photosynthesis and biomass production, but a significant interaction reduced forage quality and digestibility more than under isolated treatments of warming or non-irrigated conditions. We found a potential physiological acclimation of the tropical forage species to moderate warming when grown under rainfed or well-watered conditions. However, this acclimation was achieved due to a trade-off that reduced forage nutritional value and digestibility that may impact future animal feeding, livestock production, and would contribute to methane emissions. (C) 2020 Elsevier B.V. All rights reserved.
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