Ecosystem element balance has been a main focus of global change ecology and biogeochemical cycle research.

生态系统元素平衡是当前全球变化生态学和生物地球化学循环的研究热点和焦点。

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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