Terrestrial algae: pioneer organisms of carbonate rock solutional weathering in South China karst.

The concentration of Mg 2+ in ST group was relatively stable (24.4557 ± 0.0443 mg·L −1 ) ( Figure 3B ), while that of the KL and CH groups shown a decreasing trend (from 25.0968 mg·L −1 and 24.2928 mg·L −1 to 24.3844 mg·L −1 and 24.1152 mg·L −1 , respectively).

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