摘要
选择黄土高原丘陵沟壑区典型峁坡,采用137 Cs示踪技术,通过对不同坡向和坡位土样137 Cs含量的测定,分析了峁坡137 Cs空间分布特征及土壤侵蚀的空间分异。结果表明,不同坡向峁坡侵蚀差异明显,各坡向平均侵蚀速率大小依次为:北坡>西南坡>东北坡>西坡>西北坡>南坡>东南坡>东坡,各坡向侵蚀强度均表现为强度侵蚀;峁坡各坡向不同坡位的侵蚀差异也非常明显,坡下部侵蚀量最大,坡面中上部次之。侵蚀速率顺坡呈波动变化趋势,且侵蚀强度表现为中度、强度以及极强度侵蚀,以强度侵蚀为主。
The spatial distribution of 137 Cs and the spatial differentiation of soil erosion on typical loess hill slope in the loess hilly and gully region was analyzed by using 137 Cs tracer technique to determine the content of 137 Cs in different slope aspect positions. The results showed that there were obvious differences of erosion between different slope aspects. The order of the average erosion rate was as follows： north slope〉southwest slope〉northeast slope 〉west slope〉northwest slope〉south slope〉southeast slope〉east slope and all the slopes were characterized by strong erosion. Moreover, the erosion rates in different slope positions of the same slope aspect showed significant differences, the erosion amount in lower part of the slope was the maximum and less in the upper slope. Overall, the erosion rate showed a trend of fluctuations along the slope, and the erosion in- tensity was mainly characterized by medium, strong and extremely strong and most of them was strong.
出处
《水土保持通报》
CSCD
北大核心
2014年第4期1-4,10,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"黄土丘陵区近十年来典型流域侵蚀环境演变的泥沙响应"(41371281)
关键词
黄土峁坡
137
Cs示踪
坡向
坡位
土壤侵蚀
loess hill slope
137 CS tracer technique
aspect
slope positions
soil erosion
