SPOROPOLLEN ASSEMBLAGE OF BLACK SOIL SECTION IN EASTERN LIAOHE PLAIN: Age and Paleoclimatic Implication
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摘要:
对辽河平原东部黑土剖面PM25中0~1 m开展孢粉分析, 根据孢粉百分含量变化将化石自下而上划分为两个孢粉组合, 其中PM25-1孢粉组合以Spiraea-Artemisia-Sanguisorba-Rosa-Echinate Asteraceae为主, 气候由冷干向暖湿转变; PM25-2孢粉组合以Pinus-Cyperaceae-Chenopodium为主, 指示了气候由暖湿向冷干转变. 结合14C测年数据, 辽河平原东部黑土主要形成于1.355 ka以来的中世纪暖期.
Abstract:By analysis of sporopollen in 0-1 m black soil profile PM25 in eastern Liaohe Plain, the fossils are divided into two sporopollen assemblages from bottom to top according to the sporopollen content change. The PM25-1 sporopollen assemblage is mainly Spiraea-Artemisia-Sanguisorba-Rosa-Echinate Asteraceae, with the climate changing from cold-dry to warm-wet; while the PM25-2 sporopollen assemblage is dominated by Pinus-Cyperaceae-Chenopodium, indicating the transition of climate from warm-wet to cold-dry. Combined with the 14C dating data, it is concluded that the black soil in eastern Liaohe Plain was mainly formed in Medieval Warm Period since 1335 a B.P.
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Key words:
- Liaohe Plain /
- black soil /
- sporopollen /
- paleoclimate /
- Holocene
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表 1 梨树县黑土剖面PM25 14C测年结果
Table 1. 14C dating results of black soil profile PM25 in Lishu area
原始编号 采样深度/cm Δ14C/‰ 常规放射性年龄/a 树轮校正后年龄/cal. a B.P. 1σ（68.2%） 2σ（95.4%） CPM25-1 10~20 -60.23±3.54 430±30 68.2% 514~477 91.4% 527~450
4% 350~334CPM25-3 30~40 -83.34±3.45 630±30 39.0% 596~558
29.2% 650~62695.4% 658~552 CPM25-5 50~60 -118.04±3.32 940±30 32.3% 837~794
24.2% 875~842
8.7% 910~898
3% 886~88295.4% 922~778 CPM25-6 60~70 -153.54±3.19 1270±30 60.5% 1270~1204
7.7% 1192~118283.7% 1287~1175
11.2% 1164~1122
0.4% 1088~1084CPM25-8 80~90 -188.62±3.06 1610±30 31.4% 1454~1416
18.4% 1495~1472
18.3% 1532~151095.4% 1537~1408 CPM25-10 90~100 -211.52±2.97 1840±30 43.1% 1750~1708
20.3% 1792~1760
4.8% 1818~181091.6% 1826~1700
3.8% 1656~1640
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表 2 PM25样品氧化物含量及相关系数
Table 2. Oxide contents and correlation coefficients of samples from profile PM25
样品编号 深度/cm SiO2 Al2O3 CaO Fe2O3 K2O MgO Na2O S/A S/R A/NK 残积系数 PM25-1 5 62.20 13.00 1.12 4.13 2.52 1.17 1.37 4.78 3.63 3.34 4.68 PM25-2 15 62.40 13.20 1.11 4.09 2.45 1.16 1.37 4.73 3.61 3.46 4.75 PM25-3 25 57.90 15.50 1.54 6.36 2.42 1.50 1.00 3.74 2.65 4.53 5.41 PM25-4 35 61.10 13.50 1.68 4.73 2.38 1.23 1.22 4.53 3.35 3.75 4.41 PM25-5 45 62.00 12.80 1.50 4.76 2.26 1.18 1.35 4.84 3.53 3.55 4.36 PM25-6 55 62.60 13.30 1.69 4.60 2.28 1.25 1.35 4.71 3.50 3.66 4.17 PM25-7 65 61.10 13.30 1.50 4.87 2.27 1.26 1.28 4.59 3.36 3.75 4.50 PM25-8 75 62.40 13.60 1.32 4.75 2.34 1.28 1.29 4.59 3.40 3.75 4.72 PM25-9 85 65.20 11.80 1.22 2.97 2.40 1.03 1.36 5.53 4.41 3.14 4.09 PM25-10 95 66.30 11.20 1.16 2.64 2.43 0.89 1.43 5.92 4.79 2.90 3.98 含量单位：%.
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