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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Feedbacks and the coevolution of plants and atmospheric CO2.
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Feedbacks and the coevolution of plants and atmospheric CO2.

机译:反馈以及植物与大气CO2的共同演化。

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摘要

The coupled evolution of land plants, CO2, and climate over the last half billion years has maintained atmospheric CO2 concentrations within finite limits, indicating the involvement of a complex network of geophysiological feedbacks. But insight into this important regulatory network is extremely limited. Here we present a systems analysis of the physiological and geochemical processes involved, identifying new positive and negative feedbacks between plants and CO2 on geological time scales. Positive feedbacks accelerated falling CO2 concentrations during the evolution and diversification of terrestrial ecosystems in the Paleozoic and enhanced rising CO2 concentrations across the Triassic-Jurassic boundary during flood basalt eruptions. The existence of positive feedbacks reveals the unexpected destabilizing influence of the biota in climate regulation that led to environmental modifications accelerating rates of terrestrial plant and animal evolution in the Paleozoic.
机译:在过去的五亿年中,陆地植物,CO2和气候的共同发展使大气中的CO2浓度保持在有限的范围内,这表明涉及复杂的地球生理反馈网络。但是,对这个重要的监管网络的了解极为有限。在这里,我们介绍了涉及的生理和地球化学过程的系统分析,在地质时间尺度上确定了植物与二氧化碳之间的新的正反馈和负反馈。积极的反馈加速了古生代陆地生态系统的演化和多样化过程中二氧化碳浓度的下降,并在洪水玄武岩喷发期间跨三叠纪-侏罗纪边界的二氧化碳浓度上升。积极反馈的存在表明,生物群在气候调节中具有意想不到的破坏稳定作用,导致环境改变,加速了古生代陆地植物和动物的进化速度。

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