The vulnerability research in ecology and water resources domains is very complicated, while that in groundwater and natural disaster is relatively simple. Also…

另外在研究方法上主要是采用定性与定量相结合的方法，同时对于环境脆弱性的防范与适应对策也是极为重要的研究内容。

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In river basins, soils, groundwater, riparian zones, streams, rivers, lakes and reservoirs act as successive filters in which the hydrology, ecology and biogeochemical processing are strongly coupled and together act to retain a significant fraction of the nutrients transported.

UNESCO: Intergovernmental Oceanographic Commission