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The humification degree of peat is a significant climatic proxy for paleoclimate change.Using the alkali-extraction method,a time series of absorbance values of the Hani peatland,Northeast China,was determined,which is used as an indicator for the humification degree of peat.Combined with14C dating data of peat cellulose,and compared withδ18O andδ13C time series of the cellulose in the Hani peatland,the evidence for the existence of14 ka paleoclimate was provided.Higher humification degrees hint a warmer-wetter climate,and vice versa.It also reconstructs the four stages of Holocene climate evolution in this region:11.5–9.8 cal ka B.P.,warm and wet period;9.8–9.0 cal ka B.P.,cold and dry period;9.0–4.8 cal ka B.P.,warm and wet period;and 4.8–0 cal ka B.P.,warm-wet and dry-cold alternation period.Meanwhile,it is revealed that the abrupt climate shifts signals such as the “8.2 ka” event and the “4.2 ka” event.Results showed that the Hani peat humification degree is of sensitive response to paleoclimate change.Therefore,it is a feasible method to analyze the relationship between paleoclimate change and peat humification degree.
The humification degree of peat is a significant climatic proxy for paleoclimate change. Using the alkali-extraction method, a time series of absorbance values of the Hani peatland, Northeast China, was determined, which is used as an indicator for the humification degree of peat .Combined with14C dating data of peat cellulose, and compared withδ18O and δ13C time series of the cellulose in the Hani peatland, the evidence for the existence of14 ka paleoclimate was provided .Higher humification degrees hint a warmer-wetter climate, and vice versa.It also reconstructs the four stages of Holocene climate evolution in this region: 11.5-9.8 cal ka BP, warm and wet period; 9.8-9.0 cal ka BP, cold and dry period; -0 cal ka BP, warm-wet and dry-cold alternation period. Meanwhile, it is revealed that the abrupt climate shifts signals such as the “8.2 ka” event and the “4.2 ka” event.Results showed that that the Hani peat humification degree is is sensit ive response to paleoclimate change.Therefore, it is a feasible method to analyze the relationship between paleoclimate change and peat humification degree.