A comparison on the accumulation characteristics of Be-7 and Cs-137 in lake sediments and surface soils in western Yunnan and central Guizhou, China
文献类型：期刊论文
| 作者 | Bai, ZG; Wan, GJ; Huang, RG; Liu, TS |
| 刊名 | CATENA
 |
| 出版日期 | 2002-10-31 |
| 卷号 | 49期号:3页码:253-270 |
| 关键词 | Cs-137 and Be-7, precipitation and accumulation lake sediments surface soils Yunnan-Guizhou Plateau of China |
| ISSN号 | 0341-8162 |
| 文献子类 | Article |
| 英文摘要 | The uplifting of the Himalayas has resulted in the development of a three-tiered landform in Southern China, the Yunnan-Guizhou Plateau is the middle tier of this landform on the eastern slope of the Himalayas. Lake Hongfeng and Lake Baihua in central Guizhou are about 1000 km away from Lake Erhai in western Yunnan. Sediment cores were collected from Lakes Erhai and Lugu in west Yunnan and Lakes Hongfeng and Baihua in central Guizhou, along with 28 surface soil cores from the watersheds of these lakes. The accumulation characteristics of Be-7 and Cs-137 show that: (1) Cs-137 activities in the soil cores of central Guizhou were higher than that in the western Yunnan. The activities and maximum penetrative depth of (7) Be were similar for the two regions. The activity ratio of Be-7/Cs-137 in surface soil reached 100-1000 in western Yunnan, but only 10-100 for central Guizhou region. (2) Be-7 inventories in soil cores at most sampling sites of central Guizhou were low, reflecting severe soil erosion. Be-7 inventories in the soil cores of Lake Lugu watershed in summer-autumn were higher than that in Lake Hongfeng/Baihua watershed and also higher than that in Lake Erhai watershed. This could be related to high Be-7 precipitation in summer and altitude. (3) 7 Be inventories in sediment cores of Lake Erhai, Lake Lugu and Lake Baihua were 237 +/- 73, 322 +/- 19 and 783 +/- 44 Bq m(-2), respectively. Based on activity values that were corrected to deposition, prior to 1986, Cs-137 inventories in these lakes were 519 +/- 26, 937 +/- 13 and 3704 +/- 56 Bq m(-2), respectively. (4) Modeling indicated that Be-7 and Cs-137 accumulations in Lake Hongfeng and Lake Baihua were dominated by watershed erosion, and controlled by the retention factor in Lake Erhai and Lake Lugu, but the Cs-137 inventory ratios obtained in the sediment core and from direct atmospheric fallout were similar, and the ratios were smaller for 7 Be. (5)7 Be inventories from direct atmospheric fallout in Lake Erhai, Lake Lugu and Lake Baihua were 0.07 +/- 0.02, 0.29 +/- 0.02 and 0.08 +/- 0.01 Bq M-2, respectively. Prior to 1986, Cs-137 inventories were 0. 11 +/- 0.0 1, 0.22 +/- 0.01 and 0.37 +/- 0.01 Bq m(-2), respectively, showing that Cs-137 deposition has a regional difference. This phenomenon may reflect that uplift of the Himalayas has a screening effect on the fallout of globally distributed atmospheric pollutants in western Yunnan, China. (C) 2002 Elsevier Science B.V. All rights reserved. |
| WOS关键词 | EROSION RATES ; PB-210 ; ESTUARY ; TRACERS ; RADIONUCLIDES ; SWITZERLAND ; CESIUM-137 ; PARTICLES ; FLUXES ; TH-234 |
| WOS研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000178240200005 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/78067]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Bai, ZG |
| 作者单位 | 1.Chinese Acad Agr Sci, Inst Soil & Fertilizer, Chinese Minist Agr, Key Lab Plant Nutr Res, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Bai, ZG,Wan, GJ,Huang, RG,et al. A comparison on the accumulation characteristics of Be-7 and Cs-137 in lake sediments and surface soils in western Yunnan and central Guizhou, China[J]. CATENA,2002,49(3):253-270. |
| APA | Bai, ZG,Wan, GJ,Huang, RG,&Liu, TS.(2002).A comparison on the accumulation characteristics of Be-7 and Cs-137 in lake sediments and surface soils in western Yunnan and central Guizhou, China.CATENA,49(3),253-270. |
| MLA | Bai, ZG,et al."A comparison on the accumulation characteristics of Be-7 and Cs-137 in lake sediments and surface soils in western Yunnan and central Guizhou, China".CATENA 49.3(2002):253-270. |
入库方式： OAI收割
来源：地质与地球物理研究所
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