Hydrology and Ecological Evolution in a Permafrost Region in Northeast China Since the Late Pleistocene.

TOC and TN ( R = 0.961, p < 0.01), δ 13 C org and δ 15 N ( R = 0.842, p < 0.01) showed a highly significant positive correlation; TOC and C/N ( R = 0.792, p < 0.05), TN and C/N ( R = 0.635, p < 0.05) showed a significant positive correlation; in contrast, TOC and δ 13 C org ( R = −0.707, p < 0.05), TN and δ 15 N ( R = −0.699, p < 0.05) showed a significant negative correlation.

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( 2002 ) proposed a decreasing trend in δ 13 C org and δ 15 N values with increasing moisture and temperature in northern China, whereas TOC, TN, and C/N ratio showed the opposite pattern, increasing with increasing moisture and temperature.

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The δ 13 C org and δ 15 N showed an increasing trend (Figure 6d,e ), indicating a transition of the organic matter from exogenous C 3 plants to endogenous phytoplankton, and leading to the wetlands shrinking until they disappeared.

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