A dataset of water eight ions contents at stations of Chinese Ecosystems Research Network (CERN) during 2004-2016

Water is an important component of nature and a major environmental factor in the ecosystem. Chinese Ecosystem Research Network (CERN) conducted long-term in situ monitoring for water environments in typical ecosystems. This dataset collected water chemistry monitoring data on the eight ions (Ca2+, Mg2+, Na+, K+, HCO3- , CO32- , SO42- , Cl-) in the ground water, still surface water and flowing surface water from 34 terrestrial ecological stations during 2004-2016. The data were observed at five typical terrestrial ecosystems in China: farmland, grassland, forest, desert and peatland. With the test for accuracy and the elimination of outliers, we improved the data in format and reliability. These data are helpful in understanding the characteristics of hydrochemical changes in various ecosystems.