【摘要】：基于黃土高原南部白水縣西固鄉(xiāng)下河西村下河遺址木炭化石記錄的系統(tǒng)分析并結(jié)合高精度AMS~(14)C測年,重建了研究區(qū)5050~4870cal.aB.P.時段植被特征和古氣候要素值。研究結(jié)果顯示全新世中期溝谷地帶發(fā)育以櫟、青岡為主的闊葉林地,其中包括柿樹、棗樹等經(jīng)濟型林木。通過所鑒定的10個喬木植物種屬的共存因子法分析,獲得白水下河地區(qū)(35.14°N,109.69°E)5050~4870cal.aB.P.時段的氣候要素值。年均溫(MAT)為12.9℃,比現(xiàn)在高約1.5℃;年均降水量(MAP)為758.4mm,比現(xiàn)在高約180mm;與現(xiàn)今秦嶺南麓東部的陜西鎮(zhèn)安地區(qū)(33.45°N,109.16°E)的氣候環(huán)境相當(dāng),可能指示了氣候帶向北緯推移了約1.7°。
[Abstract]:Based on the systematic analysis of charcoal fossil records from Xiguxiang Hexicun Xihe site in Baishui County, southern Loess Plateau, and combined with high accuracy AMS~ (14) C dating, the study area was reconstructed by 5050,4870cal.aB.P. Vegetation characteristics and paleoclimate elements during the period. The results showed that the broad-leaved forest land mainly composed of Quercus and Cyclobalanopsis was developed in the middle Holocene valley area including economic trees such as persimmon and jujube trees. By means of coexisting factor analysis of 10 species of Arbor species identified, the results showed that (35.14 擄NV 109.69 擄E) 5050,4870cal.aB.Pin Baishuixiahe area. The climatic element value of the period. The annual mean temperature of (MAT) is 12.9 鈩，

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