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全球变暖加快了土壤异质性呼吸的速度
Alon Nissan1, Uria Alcolombri2, Nadav Peleg3
1Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093, Switzerland. anissan@ethz.ch.
Nature communications
|June 10, 2023
概括
土壤呼吸,一个主要的碳来源,在全球范围内正在增加. 我们的模型预测,到2100年,北极土壤将增加40%,因为土壤湿度下降,北极土壤将增加两倍以上.
科学领域:
- 地球科学 地球科学 地球科学
- 生态生态学 生态生态学
- 气候科学 气候科学
背景情况:
- 土壤呼吸是大气中最大的陆地碳来源,但在全球碳预算中仍然存在重大不确定性.
- 异质呼吸是土壤碳排放的关键组成部分,主要受到土壤温度和湿度的影响.
- 了解这些影响对于准确的气候变化建模和碳预算评估至关重要.
研究的目的:
- 开发一种从微观到全球范围内适用的机械模型,以研究土壤含水量和温度对土壤异质呼吸的影响.
- 用模拟,实验室测量和现场观测来验证模型.
- 在各种气候场景下预测全球土壤异质呼吸的未来变化.
主要方法:
- 开发一个多尺度机械模型,用于土壤异质型呼吸.
- 通过与模拟数据,实验室实验和现场观测进行比较来验证模型.
- 利用未来地表温度和土壤湿度的预测来进行预测分析.
主要成果:
- 该模型估计,自20世纪80年代以来,土壤异质呼吸的全球增加约为每十年2%左右.
- 未来的预测表明,在最糟糕的排放场景下,到本世纪末,异质性呼吸的潜在全球增加约为40%.
- 预计北极地区的异质性呼吸量将增加两倍以上,主要是由于土壤湿度下降.
结论:
- 土壤异质呼吸正在增加,对土壤水分和温度的变化敏感.
- 开发的模型为估计当前和未来的土壤碳排放提供了一个强大的工具.
- 迫切需要减缓气候变化,以制土壤碳排放预计的增加,特别是在像北极这样的脆弱地区.
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