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基于黄土高原南部白水县西固乡下河西村下河遗址木炭化石记录的系统分析并结合高精度AMS~(14)C测年,重建了研究区5050~4870cal.aB.P.时段植被特征和古气候要素值。研究结果显示全新世中期沟谷地带发育以栎、青冈为主的阔叶林地,其中包括柿树、枣树等经济型林木。通过所鉴定的10个乔木植物种属的共存因子法分析,获得白水下河地区(35.14°N,109.69°E)5050~4870cal.aB.P.时段的气候要素值。年均温(MAT)为12.9℃,比现在高约1.5℃;年均降水量(MAP)为758.4mm,比现在高约180mm;与现今秦岭南麓东部的陕西镇安地区(33.45°N,109.16°E)的气候环境相当,可能指示了气候带向北纬推移了约1.7°。
Based on the systematic analysis of the records of charcoal fossils from Xihe Moxianhe site in Xihe Village, Xigu County, Baishui County of the south of the Loess Plateau and the high-precision AMS ~ (14) C dating, the vegetation characteristics of 5050 ~ 4870cal.aB.P. Climate factor value. The results show that broad-leaved forest dominated by oak and Cyclobalanopsis glauca in mid-Holocene gullies, including economic trees such as persimmon and jujube. According to the coexistence factor analysis of the 10 tree species identified, climatic element values of 5050-4870 cal.aB.P. in Baishuihe River area (35.14 ° N, 109.69 ° E) were obtained. The average annual temperature (MAT) is 12.9 ℃, about 1.5 ℃ higher than the current average temperature. The average annual precipitation (MAP) is 758.4mm, which is about 180mm higher than it is now. Compared with the current Zhenan region (33.45 ° N, 109.16 ° E) is likely to indicate that the climatic zone has moved about 1.7 ° north.