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高寒沼泽湿地是青藏高原重要的水源涵养地,其沉积物是研究过去环境变化的重要载体.在三江源区果洛州(GLS)和青海湖北岸(QHHS)选取典型高寒沼泽湿地作为研究样地,调查其植被群落特征,并根据湿地沉积剖面的光释光年代和孢粉数据,分析湿地的古植被和古环境状况.结果表明:优势种(藏嵩草)在三江源区湿地群落和青海湖流域湿地群落中所占的优势度分别是24.43和14.74;从土壤孢粉信息表现出两个沼泽湿地自发育以来植被优势种以莎草科为主.GLS剖面显示,0~50 cm深和80~140 cm深的孢粉浓度显著高于50~80 cm深处的浓度;20 cm以下的沉积物中,花粉浓度与有机质含量呈正相关趋势,与δ13C呈负相关趋势.高寒沼泽湿地中,孢粉数据能较好地反映植物群落中莎草科的优势地位,与现生植物群落具有较好的一致性.
The alpine marsh is an important source of water conservation in the Qinghai-Tibet Plateau, and its sediment is an important carrier to study the past environmental changes.As a research sample, typical alpine marsh was selected in GLS and QHHS of the Three Rivers, , The characteristics of vegetation community were investigated and the paleoptile and paleoenvironmental status of the wetland were analyzed according to the light-light age and sporopollen data of the wetland sediment profile.The results showed that the dominant species (Kobresia) The dominance of the wetland communities in the Qinghai Lake Basin was 24.43 and 14.74, respectively. According to the sporopollen information from the soil, the dominant species of vegetation were mainly Cyperaceae since the development of the two marsh wetlands. And the concentrations of sporopollen in the depth of 80-140 cm were significantly higher than those in the depth of 50-80 cm. Among the sediments below 20 cm, the concentration of pollen was positively correlated with the content of organic matter and negatively correlated with δ13C. , Pollen data can better reflect the dominant position of Cyperaceae in plant community, which has good consistency with the existing plant community.