| 川中丘陵区人工刨地耕作方式下紫色土坡耕地侵蚀速率的137Cs和210Pbex双核素示踪法研究 |
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| 作者姓名： | ZHENG Jin-Jun HE Xiu-Bin D. WALLING ZHANG Xin-Bao D. FLANAGAN QI Yong-Qing |
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| 作者单位： | ZHENG Jin-Jun（Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 China;Graduate University of the Chinese Academy of Sciences, Beijing 100049 China） ;
HE Xiu-Bin（Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 China） ;
D. WALLING（Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 China;Department of Geography, University of Exeter, Exeter, EX4 4RJ UK） ;
ZHANG Xin-Bao（Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 China;State Key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences,Xi'an 710075 China） ;
D. FLANAGAN（USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, Indiana 47907 USA） ;
QI Yong-Qing（Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101 China） ; |
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| 基金项目： | 科技部资助项目;国家自然科学基金;四川省青年科学基金 |
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| 摘 要： | Purple soils are widely distributed in the Sichuan Hilly Basin and are highly susceptible to erosion, especially on the cultivated slopes. Quantitative assessment of the erosion rates is, however, difficult due to small size of the plots of the manually-tilled land, the complex land use, and steep hillslopes. 137Cs and 210Pbex (excess 210Pb) tracing techniques were used to investigate the spatial pattern of soil erosion rates associated with slope-land under hoe tillage in Neijiang of the Sichuan Hilly Basin. The 137Cs and 210Pbex inventories at the top of the cultivated slope were extremely low, and the highest inventories were found at the bottom of the cultivated slope. By combining the erosion rates estimates provided by both 137Cs and 210Pbex measurements, the weighted mean net soil loss from the study slope was estimated to be 3100 t km-2 year-1, which was significantly less than 6930 t km-2 year-1 reported for runoff plots on a 10°cultivated slope at the Suining Station of soil Erosion. The spatial pattern of soil erosion rates on the steep agricultural land showed that hoe tillage played an important role in soil redistribution along the slope. Also, traditional farming practices had a significant role in reducing soil loss, leading to a lower net erosion rate for the field.
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| 关 键 词： | 四川 丘陵盆地 土壤侵蚀速度 评价 人工耕种山坡 铯137 ^210pbex |
| 收稿时间： | 2006-12-16 |
| 修稿时间： | 2007-03-20 |
Assessing soil erosion rates on manually-tilled hillslopes in the Sichuan Hilly Basin using 137Cs and 210Pbex measurements |
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| ZHENG Jin-Jun,HE Xiu-Bin,D. WALLING,ZHANG Xin-Bao,D. FLANAGAN,QI Yong-Qing.Assessing soil erosion rates on manually-tilled hillslopes in the Sichuan Hilly Basin using 137Cs and 210Pbex measurements[J].Pedosphere,2007,17(3):273-283. |
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| Authors: | ZHENG Jin-Jun HE Xiu-Bin D WALLING ZHANG Xin-Bao D FLANAGAN and QI Yong-Qing |
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| Institution: | Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 (China). E-mail: jinjunzh@gmail.com;Graduate University of the Chinese Academy of Sciences, Beijing 100049 (China);Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 (China). E-mail: jinjunzh@gmail.com;Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 (China). E-mail: jinjunzh@gmail.com;Department of Geography, University of Exeter, Exeter, EX4 4RJ (UK);Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041 (China). E-mail: jinjunzh@gmail.com;State Key laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075 (China);USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, Indiana 47907 (USA);Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101 (China) |
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| Abstract: | Purple soils are widely distributed in the Sichuan Hilly Basin and are highly susceptible to erosion, especially on the cultivated slopes. Quantitative assessment of the erosion rates is, however, difficult due to small size of the plots of the manually-tilled land, the complex land use, and steep hillslopes. 137Cs and 210Pbex (excess 210Pb) tracing techniques were used to investigate the spatial pattern of soil erosion rates associated with slope-land under hoe tillage in Neijiang of the Sichuan Hilly Basin. The 137Cs and 210Pbex inventories at the top of the cultivated slope were extremely low, and the highest inventories were found at the bottom of the cultivated slope. By combining the erosion rates estimates provided by both 137Cs and 210Pbex measurements, the weighted mean net soil loss from the study slope was estimated to be 3100 t km-2 year-1, which was significantly less than 6930 t km-2 year-1 reported for runoff plots on a 10°cultivated slope at the Suining Station of soil Erosion. The spatial pattern of soil erosion rates on the steep agricultural land showed that hoe tillage played an important role in soil redistribution along the slope. Also, traditional farming practices had a significant role in reducing soil loss, leading to a lower net erosion rate for the field. |
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| Keywords: | 137Cs hoe tillage 210Pbex purple soil soil erosion |
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