Dew formation reduction in global warming experiments and the potential consequences
Dew formation reduction in global warming experiments and the potential consequences
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全球变暖实验中露水形成的减少及其潜在后果
DOI：
10.1016/j.jhydrol.2020.125819
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发表时间：
2021-02-01
影响因子：
6.4
通讯作者：
He, Jin-Sheng
中科院分区：
文献类型：
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作者：
Feng, Tianjiao;Zhang, Lixu;He, Jin-Sheng
露水作为非降雨水（NRW）的重要贡献，在干旱和半干旱地区的生态系统过程中发挥着至关重要的作用，预计会受到气候变暖的影响。红外加热器升温系统已被广泛用于模拟气候变暖对生态系统的影响。然而，这种变暖系统如何影响露水的形成长期以来一直被忽视并且很少得到解决。在青藏高原东北部典型的高寒草原生态系统中，我们于2012年至2017年采用人工凝结面、叶片湿度传感器和植物原位结露三种独立方法测量了露水量和持续时间，并测量了与露水条件相关的植物性状。结果表明：（1）与环境条件相比，变暖使露水量减少了41.6%-91.1%，具体取决于测量方法，露水持续时间减少了32.1天。 (2)不同植物功能类群的露水形成存在差异。 (3)红外增温处理下,露水量随着株高的增加而减少,而在常温条件下,露水量则呈现相反的趋势。我们的结论是，红外加热器系统的变暖大大减少了露水的形成，如果忽视，可能会导致气候变化模拟研究中高估气候变暖对生态系统过程的影响。
Dew, as an important contribution of non-rainfall water (NRW), plays a vital role in ecosystem processes in arid and semi-arid regions and is expected to be affected by climate warming. Infrared heater warming systems have been widely used to simulate climate warming effects on ecosystems. However, how this warming system affects dew formation has been long ignored and rarely addressed. In a typical alpine grassland ecosystem on the northeast of the Tibetan Plateau, we measured dew amount and duration using three independent methods: artificial condensing surfaces, leaf wetness sensors and in situ dew formation on plants from 2012 to 2017. We also measured plant traits related to dew conditions. The results showed that (1) warming reduced the dew amount by 41.6%-91.1% depending on the measurement method, and reduced dew duration by 32.1 days compared to the ambient condition. (2) Different plant functional groups differed in dew formation. (3) Under the infrared warming treatment, the dew amount decreased with plant height, while under the ambient conditions, the dew amount showed the opposite trend. We concluded that warming with an infrared heater system greatly reduces dew formation, and if ignored, it may lead to overestimation of the effects of climate warming on ecosystem processes in climate change simulation studies.