程胜高+肖河+黄庭+周莹+胡忠霞+刘晓彤

基金项目：国家自然科学基金项目(41072023)

摘要：不同地区泥炭腐殖化度指示的古气候意义存在着分歧。运用碱提取溶液吸光度法对东北哈尼泥炭腐殖化度进行测定，结合14C测年数据的年代框架，对比东北哈尼、神农架大九湖、青藏高原红原、福建天湖山地区泥炭腐殖化度气候代用指标，分析不同地区泥炭腐殖化度古气候意义异同的原因。结果表明：哈尼泥炭腐殖化度的古气候意义包含温度湿度组合，较高的腐殖化度指示气候温暖潮湿，较低的腐殖化度指示气候干燥寒冷；从哈尼、红原、大九湖、天湖山泥炭腐殖化度时间序列的对比可以得出，虽然其古气候意义有所不同，但其记录的中国全新世古气候环境演变趋势大体相同，都反映了中国早全新世阶段的升温现象、中全新世的大暖期现象及晚全新世阶段的降温；温度、湿度、季风、经纬度及地质地貌等因素都对泥炭腐殖化度有影响，但水热条件是直接影响，其他因素通过对水热条件的改变而间接影响腐殖化度；阐述不同区域泥炭腐殖化度的古气候意义没有固定模式，需结合当地的地理位置、地质地貌、年均气温、季风、降水、植被等情况进行具体分析。

关键词：泥炭；腐殖化度；碳、氧同位素；全新世；古气候；时间序列；冷事件；东北

中图分类号：P532；X16文献标志码：A

Paleoclimatic Significances of Peat Humification in Hani of Northeast China and Regional Comparison

CHENG Shenggao1,2, XIAO He1, HUANG Ting1, ZHOU Ying1, HU Zhongxia1, LIU Xiaotong1

(1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China;

2. Institute of Environmental Assessment, China University of Geosciences, Wuhan 430074, Hubei, China)

Abstract: There are different viewpoints on the paleoclimatic significances of peat humification in different regions. Alkali extracting solution absorbance method was used to measure the peat humification in Hani of Northeast China. Combined with 14C dating data for chronological framework, the proxy climate indicators of peat humification in Hani of Northeast China, Dajiuhu of Shennongjia, Hongyuan of QinghaiTibet Plateau and Tianhushan of Fujian were compared, and the reasons for similarities and differences on the paleoclimatic significance of peat humification in different regions were analyzed. The results show that the paleoclimatic significance of peat humification in Hani includes temperaturehumidity combination, and the higher humification indicates warm and humid climate, the lower humification indicates dry and cold climate; according to the comparison of peat humification temporal series in Hani, Hongyuan, Dajiuhu and Tianhushan, although the paleoclimatic significances are different, but the evolution trends of Holocene paleoclimate environment recorded are almost the same; the records include warming in Early Holocene, megathermal in Middle Holocene and cooling in Late Holocene; the effects of temperature, humidity, monsoon, latitude and longitude and geological landform on peat humification are significant, but the hydrothermal conditions are direct, and the other factors are indirect; it is different to explain the paleoclimatic significances of peat humification in different regions, and the location, geological landform, average annual temperature, monsoon, precipitation and vegetation should be considered.

Key words: peat; humification; carbon and oxygen isotopes; Holocene; paleoclimate; temporal series; cold event; Northeast China

0引言

泥炭是不同分解程度的松软有机体堆积物，这种有机体主要是植物残体。泥炭沼泽植物死亡后受到各种生物化学作用，首先是复杂的有机质转变为简单的有机物质及CO2和水，然后这些物质再合成新的较复杂的有机物质圈，分解与合成这两个过程相互交替的进行着，制约着泥炭的形成与发育。……