摘要
本研究基于淮河蚌埠闸以上地区60个气象站点1961-2015年的日尺度数据,借助作物水分亏缺指数(Crop Water Deficit Index,CWDI)和相对湿润度指数(Relative Moisture Index,M)分别表征冬小麦干旱和气象干旱,分析2种干旱的时空演变特征,计算冬小麦干旱对气象干旱的时滞,最后探讨了冬小麦干旱时滞与下垫面地理因子之间的关系,得出结论:1)时间尺度上,对CWDI而言,除灌浆成熟期外,其余生育期的CWDI呈微弱下降趋势;对M而言,各生育期的年际趋势均无明显变化;空间尺度上,CWDI和M各站点中旱以上级别占比均呈现由北部向南部递减特征。2)冬小麦干旱对气象干旱的时滞在返青抽穗期最短,为3.21d,越冬期的时滞最长,为84.35d。3)各生育期的下垫面地理因子与冬小麦干旱时滞的关联度都较好,均在0.5以上。各下垫面地理因子与冬小麦干旱时滞关联度高值点多分布在土壤持水力较差、海拔较高、坡度较陡的山区,东及东北坡向的地区,降水较少、气温较低的北部地区。
Based on the daily scale data of 60 meteorological stations of 1961 to 2015 above the Bengbu Sluice in the Huaihe River,this study uses Crop Water Deficit Index(CWDI)and Relative Moisture Index(M)to represent the drought of winter wheat and meteorological drought respectively.Then,we analyze the spatial-temporal evolution characteristics of two kinds of drought,calculate the time lag of winter wheat drought to meteorological drought,and finally discuss the relationship between the time lag of winter wheat drought to meteorological drought and underlying surface geographical factors.We drew some conclusions:Firstly,in terms of time scale,for CWDI,except for the filling and mature period,the CWDI at other growth periods shows a slight downward trend;For M,there is no significant change in the interannual trend of each growth period.In terms of spatial scale,the proportion of above moderate drought level in each station of CWDI and M presents a decreasing feature from north to south.Secondly,the time lag of winter wheat drought to meteorological drought is the shortest(3.21d)in the greening and heading period and the longest at over-wintering period(84.35d).Thirdly,the correlation between the geographical factors and the time lag of winter wheat drought in each growth period is better than 0.5.The high value points of the relation between the underlying surface geographical factors and the time lag of winter wheat drought are mostly distributed in the mountainous areas with poor soil field capacity,high elevation and steep slope,the areas with aspect to the east and northeast,and the northern areas with less precipitation and lower temperature.
作者
陈财
阮甜
罗纲
高超
CHEN Cai;RUAN Tian;LUO Gang;GAO Chao(Department of Geography&Spatial Information Techniques,Ningbo University,Ningbo 315211,China;School of Geography and Tourism,Anhui Normal University,Wuhu 241000,China)
出处
《自然灾害学报》
CSCD
北大核心
2019年第5期113-124,共12页
Journal of Natural Disasters
基金
国家自然科学基金项目(41871024)~~
关键词
冬小麦干旱
气象干旱
时滞
地理因子
淮河蚌埠闸以上地区
winter wheat drought
meteorological drought
time lag
geographical factors
above the Bengbu Sluice in the Huaihe River
