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[交流] 温暖、富含二氧化碳的气候中，干旱限制了草地的用水和土壤水的混合已有1人参与

Drought in a warmer, CO2-rich climate restricts grassland water use and soil water mixing

温暖、富含二氧化碳的气候中，干旱限制了草地的用水和土壤水的混合

▲ 作者：JESSE RADOLINSKI, MATEVZ VREMEC, HERBERT WACHTER, STEFFEN BIRK, NICOLAS BRüGGEMANN, MARKUS HERNDL, ANSGAR KAHMEN, DANIEL B. NELSON, ANGELIKA KüBERT, AND MICHAEL BAHN

▲链接：

https://www.science.org/doi/10.1126/science.ado0734

▲摘要：

土壤水维持着地球上的生命，但在气候变化的情况下，它的命运是不确定的。研究者进行了一项氘标记实验，以确定大气二氧化碳升高、变暖和干旱是否会影响温带草原土壤水分的储存和运输。与环境条件相比，升高的二氧化碳使根区更加湿润，而变暖则降低了土壤水分。

除了夏季干旱、气候变暖和二氧化碳浓度升高外，在所有全球变化处理中，土壤水分保持良好混合。这些组合处理使草地保持水分，限制土壤水分流向快速排水的大孔隙，而不与缓慢排水的小孔隙混合。研究结果表明，在更温暖、更富二氧化碳的气候条件下，干旱会通过限制干旱后土壤水流和草地水分利用来严重改变草地生态水文。

▲ Abstract：

Soil water sustains terrestrial life, yet its fate is uncertain under a changing climate. We conducted a deuterium labeling experiment to determine whether elevated atmospheric carbon dioxide (CO2), warming, and drought impact soil water storage and transport in a temperate grassland. Elevated CO2 created a wetter rootzone compared with ambient conditions, whereas warming decreased soil moisture. Soil water remained well mixed in all global change treatments except for summer drought combined with warming and elevated CO2. These combined treatments caused the grassland to conserve water and restricted soil water flow to large, rapidly draining pores without mixing with small, slowly draining pores. Our results suggest that drought in a warmer, more CO2-rich climate can severely alter grassland ecohydrology by constraining postdrought soil water flow and grassland water use.

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