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yexuqing木蟲之王 (文學(xué)泰斗)
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溫暖、富含二氧化碳的氣候中,干旱限制了草地的用水和土壤水的混合 已有1人參與
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Drought in a warmer, CO2-rich climate restricts grassland water use and soil water mixing 溫暖、富含二氧化碳的氣候中,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 ▲鏈接: https://www.science.org/doi/10.1126/science.ado0734 ▲摘要: 土壤水維持著地球上的生命,但在氣候變化的情況下,它的命運是不確定的。研究者進行了一項氘標(biāo)記實驗,以確定大氣二氧化碳升高、變暖和干旱是否會影響溫帶草原土壤水分的儲存和運輸。與環(huán)境條件相比,升高的二氧化碳使根區(qū)更加濕潤,而變暖則降低了土壤水分。 除了夏季干旱、氣候變暖和二氧化碳濃度升高外,在所有全球變化處理中,土壤水分保持良好混合。這些組合處理使草地保持水分,限制土壤水分流向快速排水的大孔隙,而不與緩慢排水的小孔隙混合。研究結(jié)果表明,在更溫暖、更富二氧化碳的氣候條件下,干旱會通過限制干旱后土壤水流和草地水分利用來嚴重改變草地生態(tài)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. |

金蟲 (著名寫手)
少將
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