关中东部地区全新世土壤发育及记录的水文事件  

HYDROLOGICAL EVENTS RECORDED IN THE HOLOCENE SOIL IN GUANZHONG AREA, CHINA

作　　者：庞奖励[1] 黄春长[1,2] 贾耀峰 

机构地区：[1]陕西师范大学旅游与环境学院,西北历史环境与经济社会发展研究中心 [2]黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《土壤学报》2005年第2期187-193,共7页Acta Pedologica Sinica

基　　金：国家自然科学基金项目 (4 0 471119);教育部人文社会科学重点研究基地重大招标项目 (0 1JDJAZ770 0 14 )资助

摘　　要：通过对华县老官台全新世黄土-古土壤高分辨率的研究,揭示关中盆地在全新世曾有两个重要的湿润多雨、地表径流活跃的时期。其中第一个时期发生在全新世初期的90 0 0～85 0 0aBP ,它表现为末次冰期结束后气候在向全新世大暖期发展过程中,湿度的增加滞后于温度的增加。第二个时期发生在4 0 0 0～36 0 0aBP ,此时正是夏代文化发展的时期,在研究地点周围。A Holocene loess palaeosol sequence at the Laoguantai site in the eastern part of the Guanzhong Basin was studied for identifying changes in surface hydrology during the last 11 500 years. The profile was dated with the prehistorical remains and optically stimulated luminescence techniques. Results of the studies in the field and the laboratory provide new insights into soil development and pattern of climatic changes in this area. The soil S 0 was a soil complex composed of the lower soil S 2 0 and the upper S 1 0. Two rainwash beds were identified in the profile, whose presence in the aeolian loess in the southern Loess Plateau means that the climate was wet enough to cause active surface runoff during their deposition. They are regarded as the records of surface hydrological events during the rainy and wet phases. The first humid period identified at 9 000～8 500 a BP in the eastern Guanzhong basin suggested that the rainfall change was evidently not in phase with the temperature change in the early Holocene. The increasing in rainfall took place later than that in the temperature. The second rainwash bed, identified at 4 000～ 3 600 a BP, was another rainy and wet period. The strength of the soil erosion and deposition was intensified by the human activities in the stage.

关 键 词：全新世大暖期 黄土-古土壤 水文 末次冰期 人类活动 高分辨率 堆积 土壤发育 时期 湿度 

分 类 号：S151[农业科学—土壤学] P532[农业科学—农业基础科学]