In the second volume of Nature Plants in 2016, eight years of research by Dr. Sharon B. Gray and Professor Andrew DBLeakey were published. It is believed that the increase in CO2 emissions from climate change will be offset by drought. Increasing greenhouse gases such as CO2 will lead to climate change such as temperature rise and drought. It has been widely predicted by the scientific community that the increased yield of CO2 will offset the crop yield caused by drought. After eight years of experimental research, the research team led by Professor Andrew Leakey of the United States showed that the increased yield of CO2 could not offset the crop yield reduction caused by drought. On the contrary, the increase in CO2 yield to crop yields would be offset by drought. - Even the end of production, which highlights the negative impact of global climate change on major food producing areas!
Professor Leakey et al. used BTC-100 micro-root window observation, soil moisture profile monitoring, photosynthesis measurement and FACECO2 raising device to monitor crops (soybean) under elevated CO2 conditions and soil under drought stress conditions. Profile water conditions, crop roots (fine roots) and nodule growth, aboveground leaf area, photosynthesis, stomatal conductance, canopy temperature and other parameters, which proves that the previously thought of elevated CO2 can maintain soil moisture and increase crop yield. And offsetting the effects of drought stress, are one-sided or even wrong; with the temperature rise caused by climate change, the increase of drought degree and extreme weather, the negative impact of global changes will affect the global food producing areas, humans There is an urgent need to find adaptive countermeasures.
Underground ecological observation: The underground observation micro-root tube and the soil moisture measurement tube are adjacent, and the two have the same distribution and position relative to the crop line. Image acquisition was performed along the upper surface of the microtubule tube using a BTC-100 video microscope and a BTC I-CAP image acquisition system (Bartz Technology Corp.), once every two weeks, each tube was collected at a depth of 1.3 cm each time. 80 images. The root length and diameter were analyzed by root analysis software. Combined with the soil area and depth, the root length density (root length density, unit thickness of cm/cm3) was calculated and the nodule was automatically identified and counted.
2009-2011 (3 years) growth season DOY (days of year) different soil depth soybean root length density RLD (cm / cm3). Dotted lines and open circles refer to environmental CO2, control rainfall conditions (AC-CP), dotted lines and hollow squares refer to environmental CO2, drought stress conditions (AC-RP), solid lines and gray solid circles indicate CO2 elevation, under control conditions of precipitation (EC-CP), the solid line and the gray square refers to the solid core elevated CO2, under drought stress conditions (EC-RP)
Research team working in the field
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