Under the overlapped influence from accelerated climate changes and intensified human activities, water-related processes (e.g., evapotranspiration, runoff and water-rock interaction) have been greatly altered in the earths' surface. Frequent water disasters, such as typhoons, extreme precipitation, droughts, and floods directly lead to negative impacts on the safety of ecosystems. Additionally, as hydrological and hydrochemical processes are closely related to the transforming and flux of nutrients and pollutants (e.g., pesticides, heavy metals and emerging organic contaminants), they may pose great threats to the biodiversity, land productivity and human health in ecosystems, especially fragile ones. Interpreting the dynamics of hydrological and hydrochemical variations under changing climate and anthropogenic forces is of benefit to the sustainable water management as well as ecological protection and restoration. Nevertheless, the behaviors of water in response to changing environments and the interaction with ecosystems are complicated due to the synergistic effect from multiple factors, making it difficult to explain the dynamics of water-related ecosystem deterioration.

The combination of innovative theories, new technologies and advanced equipment for observation could provide wider information to help understand these complicated processes. In this Research Topic, the overall objective of is to improve the knowledge on the processes of hydrology and hydrochemistry, their responses to changing environment, as well as the mechanisms of their ecological effects in fragile ecosystems such as wetlands, oases and inland lakes. Contributors are encouraged to share their new findings and progresses associated with the water cycle, exchange and interaction in ecosystems, on the basis of multiple methods including field observation, lab experiment, numerical simulation, isotope tracers and remote sensing. Of particular interests are contributions exploring the relationships between water, ecosystems and society through integrated approaches. Review articles related to the current state, challenges, and suggestions on hydrological and hydrochemical processes as well as water resources management are also welcomed.

This Research Topics include but are not limited to the following points:
• Hydrological and hydrochemical responses to climate changes and human activities.
• Interaction between water and ecosystems.
• Impacts of water-related disasters on the safety of ecosystems.
• Hydrochemical evolution and water quality assessment in fragile ecosystems.
• Complementary monitoring methods for hydrological and ecohydrological processes.
• Effect of hydrological and hydrochemical processes on the state of ecosystems.
• Nutrient-sediment transport driven by water cycle.
• Water resources management under changing environments.
• Mechanisms of migration and storage of water in the environment.

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Frontiers in Ecology and Evolution

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