摘要
通过采用Mann-Kendall趋势分析法、小波分析方法、地统计插值等方法,基于黄土高原塬面保护区及临近的21个站点的逐日降水量数据,对区域内降雨侵蚀力的时空变化,趋势及主要影响因素进行了分析。结果表明:(1)黄土塬面保护区1960-2017年多年平均降雨量为599.2 mm;多年平均降雨侵蚀力为1 871.91 MJ·mm·hm-2·h-1·a-1,降雨侵蚀力在过去60 a来呈微弱上升趋势且变化的季节差异显著。(2)黄土高原塬面保护区降雨侵蚀力的空间分布大体呈由南部向两侧递减的趋势,Mann-Kendall Z值除研究区北部、东部呈下降趋势,其余区域都为上升趋势。(3)黄土高原塬面保护区降雨侵蚀力多年存在32 a的大周期,在大周期内还存在13 a、52 a的小周期。(4)影响北半球中高纬度地区的主要的大气环流因子中仅Cold&Warm Episodes by Season因子的波动对整个区域和陕西塬区的降雨侵蚀力有一定影响,二者存在一定的负相关性,其余环流指数与降雨侵蚀力没有显著的关联性;此外太阳黑子与陕西塬区降水侵蚀力变化规律存在一定的正相关,与其他塬区并无显著关联性。
Based on daily precipitation data for the table land-protected area,this paper analyzed temporal and spatial variation and trends and explored the main factors influencing rainfall erosion according to Mann-Kendall analysis,wavelet analysis and statistical methods.Results reveal as follows:(1)The average annual rainfall of the Loess Plateau protected area in Shanxi,Shaanxi and Gansu Provinces,China over the past 60 years is 599.2 mm,the average annual rainfall erosivity is 1871.91 MJ·mm·hm-2·h-1·a-1,and the rainfall erosivity is.There has been a slight upward trend over the past 60 years and seasonal differences have changed significantly.(2)The spatial distribution of rainfall erosivity in the Loess Plateau protected area is found to generally decrease from the south to both sides.The Mann-Kendall Z value shows a downward trend except for the northern and eastern parts of the study area,while all other regions show an upward trend.(3)The rainfall erosivity of the Loess Plateau protected area has a long period of 32 years,also showing 13 years and 52 years of shorter periods during the time period studied.(4)Of the main atmospheric circulation factors affecting the mid-high latitudes in the northern hemisphere,only the factor reflecting the fluctuation of cold and warm episodes by season has a significant effect on rainfall erosion of the entire region and the Shaanxi highland.There is a negative correlation between the two and the remaining circulation index.There is found to be no significant correlation with rainfall erosion;in addition,sunspots show a positive correlation with the change law of precipitation erosion in Shaanxi plateau area,but no significant correlation with the other plateau areas.
作者
孙从建
王佳瑞
郑振婧
陈伟
孙九林
SUN Cong-jian;WANG Jia-rui;ZHENG Zhen-jing;CHEN Wei;SUN Jiu-lin(School of Geographical Sciences,Shanxi Normal University,Linfen 041000,Shanxi,China;Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China)
出处
《干旱区地理》
CSCD
北大核心
2020年第3期568-576,共9页
Arid Land Geography
基金
山西省应用基础研究计划项目(201901D211388)
国家自然科学基金(41601317)
山西师范大学研究生双语课程建设计划项目(YJSSY201904)资助。
关键词
黄土高原
降雨侵蚀力
时空分布
影响因素
Loess Plateau
rainfall erosion
spatial and temporal distribution
influence factor
