桂西北倒石堆型岩溶坡地土壤的~(137)Cs分布特点
文献类型：期刊论文
| 作者 | 文安邦 ; 张信宝
|
| 刊名 | 水土保持学报
 |
| 出版日期 | 2009-06-15 |
| 卷号 | 23期号:3页码:42-47 |
| 关键词 | 137Cs 分布特点 倒石堆型岩溶坡地 桂西北 |
| 其他题名 | ~(137)Cs Distribution Characteristics at a Talus-type Karst Slope in Northwestern Guangxi |
| 通讯作者 | 张信宝 |
| 合作状况 | 其它 |
| 中文摘要 | 为了查明岩溶坡地土壤的137Cs分布特点,以判别137Cs法是否适用于岩溶坡地土壤流失量的测定,在桂西北开展了倒石堆型岩溶坡地土壤137Cs分布特点的研究。结果表明,无侵蚀的岩溶坡地土壤137Cs空间分布具有土壤的137Cs面积活度远低于区域本底值、表层土壤<2 mm样品的137Cs比活度高、137Cs空间分布变异大等特点。产生这种现象的主要原因是:(1)粒度粗,土层薄,137Cs吸附总量有限;(2)岩溶坡地裸石面积比例大,137Cs降尘核爆期间流失比例高;(3)土壤中碳酸盐颗粒的溶蚀,促进了吸附137Cs尘埃的洗失等。合理解释无侵蚀岩溶坡地表层土壤的137Cs面积活度低于137Cs本底值的现象,对评价137Cs法测定岩溶坡地土壤流失量的适用性至关重要。研究表明,不宜用现行的137Cs示踪方法测定岩溶坡地的土壤流失量。 |
| 英文摘要 | It is important t hat find out the characteristics of 137 Cs dist ribution at karst slopes and for determi2 ning t he feasibility of estimating soil loss for karst slopes by t he 137 Cs t racing technique. The st udy for 137 Cs dist ribution characteristics at a talus2type karst slope was carried out at Huanjiang Experimental Station of Kar st Ecosystem , Chinese Academy of Sciences , Huanjiang County , Guangxi , sout hwestern China recently. The p reliminary result s showed t hat 137 Cs dist ribution characteristics at t he st udy slope without soil erosion including : (1) the 137 Cs areal activities of the slope soils were much lower t han t he local reference inventory ; (2) t he surface soil s at study slope had high 137 Cs specific activities ; (3) t he 137 Cs spatial dist ribution had a great variation. It is very important to find out t he characteristic of 137 Cs dist ribution in soil s at kar st slope for distinguish t he applicability of 137 Cs technique for estimating t he soil losses. The reasons why t he 137 Cs areal activities of non2soil erosion slope soils were much lower than t he local reference inventory possibly in2 cluding : (1) t he 137 Cs absorption amount were limit due to t he coarse granularity and thin soil covering ; (2) t here are large area bared rocks dist ributing at t he karst slopes. The 137 Cs dust reaching t he land surface wit h precipitation were not absorbed by bared rock basically , and t hen a greater proportion of 137 Cs lost wit h run2 off during t he nuclear bomb test s ; (3) t he dissolutions of carbonate grain in soil s promoted the losses of 137 Cs dust . It is recommended that t he current 137 Cs t racing met hods could not be used for estimating t he soil losses at kar st slopes. |
| 资助信息 | 中国科学院西部行动计划项目(KZCX2-XB2-08);国家973计划(2006CB403200) |
| 语种 | 中文 |
| 公开日期 | 2010-08-31 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/1739]  |
| 专题 | 成都山地灾害与环境研究所_成都山地所知识仓储（2009年以前） 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 科技与合作处 |
| 推荐引用方式 GB/T 7714 | 文安邦,张信宝. 桂西北倒石堆型岩溶坡地土壤的~(137)Cs分布特点[J]. 水土保持学报,2009,23(3):42-47. |
| APA | 文安邦,&张信宝.(2009).桂西北倒石堆型岩溶坡地土壤的~(137)Cs分布特点.水土保持学报,23(3),42-47. |
| MLA | 文安邦,et al."桂西北倒石堆型岩溶坡地土壤的~(137)Cs分布特点".水土保持学报 23.3(2009):42-47. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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