| 海原剖面12.5-7.2kaBP期间化学元素与粒度组成的古环境意义 |
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| 引用本文： | 孙爱芝,韩晓丽,强杨,徐星娜.海原剖面12.5-7.2kaBP期间化学元素与粒度组成的古环境意义[J].干旱区资源与环境,2011(7):146-149. |
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| 作者姓名： | 孙爱芝 韩晓丽 强杨 徐星娜 |
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| 作者单位： | 西南大学地理科学学院; |
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| 基金项目： | 重庆市自然科学基金(批准号:2009BB); 国家自然科学重点项目(基金批准号:40331012)资助 |
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| 摘 要： | 宁夏南部海原剖面12.5-7.2 kaBP期间的地球化学元素含量与粒度组成的环境指示意义显著,主要表现为冷干气候条件下植被稀疏,上游及坡面植被水土保持能力低造成粗颗粒物质含量较多,易溶元素如Na氧化物较多被淋失,难溶解的Si、Al、Fe氧化物相对富集;暖湿气候条件下植被发育良好,剖面沉积的细颗粒物质含量较多,土壤中Na...
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| 关 键 词： | 化学元素氧化物 粒度组成 孢粉记录 黄土高原西北部 |
The grainsize and the chemical elements at the Haiyuan section implicating the paleoenvironment during 12.5 to 7.2 kaBP |
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| SUN Aizhi,HAN Xiaoli,QIANG Yang,XU Xingna.The grainsize and the chemical elements at the Haiyuan section implicating the paleoenvironment during 12.5 to 7.2 kaBP[J].Journal of Arid Land Resources and Environment,2011(7):146-149. |
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| Authors: | SUN Aizhi HAN Xiaoli QIANG Yang XU Xingna |
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| Institution: | SUN Aizhi,HAN Xiaoli,QIANG Yang,XU Xingna(School of Geographic Science,Southwest University,Chongqing 400715,P.R.China) |
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| Abstract: | The changes of grainsize and the content of geochemical element of Haiyuan section implicate the environment between 12.5 and 7.2 ka BP.Combined with the recoreds of pollen,we can draw the following conclusion: The coarsegrain is obviously rich,at the same time,SiO2、Al2O3、Fe2O3 are riched and Na2O is poor in the sediments formed under the conditions of cold-dry climate due to low vegetation cover and the water and soil loss.The finegrain is rich,SiO2、Al2O3、Fe2O3 are poor and Na2O is rich in the sediments formed under the conditions of warm-moist climate due to high vegetation cover.It needs motion that the content of Na2O and K2O with similar chemical characterise show opposite,especially in warm-moist environment.It appears opposite which probably was the biogeochemical function,because the plant absorpt K more than Na. |
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| Keywords: | Oxide grainsize the records of spore and pollen northwestern Loess plateau |
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