Wu Haidong, Yan Liang, Li Yong, Zhang Kerou, Hao Yanbin, Wang Jinzhi, Zhang Xiaodong, Yan Zhongqing, Zhang Yuan, Kang Xiaoming
Institute of Wetland Research, Chinese Academy of Forestry, Beijing, China.
Beijing Key Laboratory of Wetland Services and Restoration, Beijing, China.
PeerJ. 2020 Apr 2;8:e8874. doi: 10.7717/peerj.8874. eCollection 2020.
Accurate estimation of CH fluxes in alpine peatland of the Qinghai-Tibetan Plateau under extreme drought is vital for understanding the global carbon cycle and predicting future climate change. However, studies on the impacts of extreme drought on peatland CH fluxes are limited. To study the effects of extreme drought on CH fluxes of the Zoige alpine peatland ecosystem, the CH fluxes during both extreme drought treatment (D) and control treatment (CK) were monitored using a static enclosed chamber in a control platform of extreme drought. The results showed that extreme drought significantly decreased CH fluxes in the Zoige alpine peatland by 31.54% ( < 0.05). Extreme drought significantly reduced the soil water content (SWC) ( < 0.05), but had no significant effect on soil temperature (Ts). Under extreme drought and control treatments, there was a significant negative correlation between CH fluxes and environmental factors (Ts and SWC), except Ts, at a depth of 5cm ( < 0.05). Extreme drought reduced the correlation between CH fluxes and environmental factors and significantly weakened the sensitivity of CH fluxes to SWC ( < 0.01). Moreover, it was found that the correlation between subsoil (20 cm) environmental factors and CH fluxes was higher than with the topsoil (5, 10 cm) environmental factors under the control and extreme drought treatments. These results provide a better understanding of the extreme drought effects on CH fluxes of alpine peatland, and their hydrothermal impact factors, which provides a reliable reference for peatland protection and management.
准确估算青藏高原高寒泥炭地在极端干旱条件下的CH通量对于理解全球碳循环和预测未来气候变化至关重要。然而，关于极端干旱对泥炭地CH通量影响的研究有限。为了研究极端干旱对若尔盖高寒泥炭地生态系统CH通量的影响，在极端干旱控制平台上使用静态密闭箱监测了极端干旱处理（D）和对照处理（CK）期间的CH通量。结果表明，极端干旱使若尔盖高寒泥炭地的CH通量显著降低了31.54%（P<0.05）。极端干旱显著降低了土壤含水量（SWC）（P<0.05），但对土壤温度（Ts）没有显著影响。在极端干旱和对照处理下，除5厘米深度处的Ts外，CH通量与环境因子（Ts和SWC）之间存在显著负相关（P<0.05）。极端干旱降低了CH通量与环境因子之间的相关性，并显著削弱了CH通量对SWC的敏感性（P<0.01）。此外，发现在对照和极端干旱处理下，亚表层（20厘米）环境因子与CH通量之间的相关性高于表层土壤（5、10厘米）环境因子与CH通量之间的相关性。这些结果有助于更好地理解极端干旱对高寒泥炭地CH通量的影响及其水热影响因素，为泥炭地保护和管理提供了可靠的参考。
