摘要
利用青海省43个气象站1961-2010年的观测资料,选择联合国粮农组织给出的风蚀气候因子指数计算公式,计算了青海省风蚀气候因子指数值,以此阐述了风蚀气候侵蚀力的基本特征.结果表明,多年平均风蚀气候因子指数C值得分布范围为-12.9~160.1,整个青海省的平均值为32.4;从空间分布来看,C值由西北部向东南部呈减小趋势,最大值出现在柴达木盆地的茫崖;风蚀气候因子指数具有显著的月际和季节变化,春季最大,冬季次之,夏季最小;近50 a来风蚀气候因子指数总体上呈现减小趋势,说明风蚀气候侵蚀力在降低;风蚀气候侵蚀力主要受风速的制约,与降水和沙尘暴日数的关系不显著.
By making use of calculation method of wind erosion climatic erosivity factor index developed by FAO and observation data from 43 meteorological stations during 1961 to 2010 in Qinghai Province, we analyzed the basic features of wind erosion climatic erosivity. The results showed that the range of wind erosion climatic erosivity factor index of C value varied from -- 12.9 to 160.1 ; the average of C value was 32.4 in Qinghai Province. Spatially, C value displayed the decrease trend from northwest to southeast and the maximum of C value appeared at Mangai in the Qaidam Basin. Wind erosion climatic erosivity factor had seasonal and inter-monthly variation, the highest value showed in spring, the second one in winter and the lowest one in summer. Wind erosion climatic erosivity factor had the decrease tendency in recent 50 years which revealed that wind erosion climatic erosivity was reducing. Wind speed was main restricting factors of wind erosion climatic erosivity. The relationship between wind erosion climatic erosivity, precipitation and sandstorm days was not significant.
出处
《水土保持研究》
CSCD
北大核心
2015年第6期234-239,共6页
Research of Soil and Water Conservation
基金
国家自然科学基金地区科学资助项目(41161009
41165008)
公益性行业(气象)专项(GYGH201306054
GYHY201506001)
高原气象研究所资助项目(LPM2014004)
关键词
风蚀气候侵蚀力
风蚀气候因子
相对贡献率
MANN-KENDALL检验
青海省
wind erosion climatic erosivity
wind erosion climatic erosivity factor
relative contribution rate
Mann-Kendall test
Qinghai Province