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^(137)Cs tracing of lacustrine sediments in the Dalian Lake,Qinghai Province,china

Chinese Science Bulletin 2001年第S1期46卷 83-87页

作者： van ping, dong guangrong & dong zhibaochina certer of desert research at beijing normal university, beijing100875, china:key laboratory of environmental change and natural disaster, the ministry of education of china, beijing normal university, beijing 100875, china Cold and Arid Regions environmental and Engineering research Institute, Chinese Academy of Sciences, Lanzhou 730000, china china certer of desert research at beijing normal university Beijing China key laboratory of environmental change and natural disaster The Ministry of Education of China Beijing Normal University Beijing China Cold and Arid Regions environmental and Engineering research Institute Chinese Academy of Sciences Lanzhou China

Based upon the analysis of Cs and grain-size parameters, the total amounts of 137Cs deposition by wind and water in the Dalian Lake of Gonghe Basin, Qinghai Province are defined. The vertical profile of 137Cs in the lacustrine sediments exhibits three 137Cs activity maxima and one minimum. The major maximum corresponds to the global I37Cs fallout in 1963; the two secondary maxima correspond to the leakage of the Chernobyl reactor in 1986 and complete desiccation of the lake in 1994, respectively. The minimum corresponds to aeolian deposition caused by extensive reclamation in the late 1980s and early 1990s. The 137Cs data set was used to evaluate average sedimentation rate of the Dalian Lake since 1963. The deposition was stable in 1963-1986 and 1994-1998, and it was rapid during 1986?994. This preliminary study reveals that l37Cs has the same potential to trace environmental changes introduce by human interference in arid/semiarid regions as in humid regions.

关键词： 137Cs technique Dalian Lake sedimentation rate.

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Preliminary results of the study on wind erosion in the Qinghai-Tibetan Plateau using 137Cs technique

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Chinese Science Bulletin 2000年第11期45卷 1019-1025页

作者： YAN ping, dong guangrong, ZHANG Xinbao & ZHANG Yiyun1. key laboratory of environmental change and natural disaster, the ministry of education of china, beijing normal university, beijing 100875, china 2. Institute of desert research, Chinese Academy of Sciences, Lanzhou 730000, china 3. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, china 4. Department of Physics, Sichuan Union university, Chengdu 610041, china key laboratory of environmental change and natural disaster the Ministry of Education of China Beijing Normal University Beijing China Institute of desert research Chinese Academy of Sciences Lanzhou China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China Department of Physics Sichuan Union University Chengdu China

The worldwide fallout of caesium-137 (137Cs) associated with the nuclear weapon tests during the 1950s and 1960s has provided a valuable man-made tracer for studies of soil erosion and sediment delivery. But relatively few researchers have used it to estimate wind erosion. In this note, the 137Cs technique is introduced into the studies of wind erosion and its modern processes inthe Qinghai-Tibetan Plateau. Two 137Cs reference inventories of 982.11 and 2 376.04 Bq · m-2 wereestablished preminarily, distributed in the south and middle-north parts of the studied arearespectively. By analyzing the patterns of 137Cs depth profiles from sampling sites, the aeolianprocesses of erosion and deposition in nearly 40 years have been revealed, i.e. the shrub coppicedunes (S1) and semi-fixed dunefields (S3) experienced the alternation of erosion and deposition,while the grasslands (S4, S6 and S7) and dry farmlands (S5) suffered erosion only. By using 137Csmodel, the average wind erosion rates for shrub coppice

关键词： 137Cs technique Qinghai-Tibetan Plateau wind erosion.

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Characteristics of ^(137)Cs deposition in steppe area

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Chinese Science Bulletin 2002年第10期47卷 848-853页

作者： ZHANG Chunlai, ZOU Xueyong,dong guangrong, ZHANG Xinbao & QIN Zhilaboratory of Blown Sand Physics and Engineering, Cold and Arid Regions environmental and Engineering research Institute, Chinese Academy of Sciences, Lanzhou 730000, china china Center of D laboratory of Blown Sand Physics and Engineering Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou China china Center of desert research at beijing normal university Key Laboratory of Environmental Change and Natural Disaster of the Ministry of Education of China Beijing Normal University Beijing China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China Institute of Modern Physics Chinese Academy of Sciences Lanzhou China

Soil wind erosion in the semiarid steppe area was studied using the 137Cs tracing technique. Comparisons of 137Cs deposition characteristics between different soil profiles indicated that slight aeolian activities occurred on sandy grasslands and semi-fixed dunes with erosion/deposition rates of less than 0.108 cm/a, whereas they were intense on semi-shifting dunes with erosion/deposition rates of higher than 1.35 cm/a.

关键词： 137Cs steppe soil wind erosion.

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