摘要
Bangladesh is one of the most vulnerable countries to natural disasters such as droughts in the world.The pre-monsoon Aus rice in Bangladesh depends on rainfall and is threatened by increasing droughts.However,limited information on the changes in Aus rice as well as droughts hamper our understanding of the country’s agricultural resilience and adaption to droughts.Here,we collected all the official statistical data of Aus rice at the district level from 1980 to 2018,and examined the interannual variations of area,yield,and production.The results showed both area and production of Aus rice decreased significantly(61.58×103 ha yr-1 and 17.21×103 M.tons yr-1,respectively),while yield increased significantly(0.03 M.tons ha-1 yr-1).We also found a significantly increasing trend of droughts in 88%of area based on the Palmer Drought Severity Index(PDSI)data,especially in those rainfed agricultural areas.Moreover,we found significant positive correlations between PDSI and Aus rice area(production)in 33(25)out of 64 districts.There is hardly a relationship between PDSI and yield,likely due to the improved management and increasing irrigated areas.Implementing continuous drought monitoring,combined irrigation(surface and groundwater)systems,and conservation and precision agriculture are highly recommended in these drought-prone districts to ensure food security in Bangladesh.
作者
KHONDAKAR Arifuzzaman
DONG Jinwei
LI Zhichao
DENG Xiangzheng
SINGHA Mrinal
RAHMAN Md.Mizanur
JIN Zhenong
WANG Shaoqiang
ZHEN Lin
XIAO Xiangming
KHONDAKAR Arifuzzaman;董金玮;李之超;邓祥征;SINGHA Mrinal;RAHMAN Md.Mizanur;金哲侬;王绍强;甄霖;肖向明(Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100094,China;Department of Geography and Environment,Pabna University of Science and Technology,Pabna 6600,Bangladesh;Deputy Director(Monitoring),Field Services Wing,Department of Agricultural Extension,Ministry of Agriculture,Bangladesh;Department of Bioproducts and Biosystems Engineering,University of Minnesota-Twin Cities,Saint Paul,MN,USA;Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China;Department of Microbiology and Plant Biology,University of Oklahoma,Norman OK 73019,USA)
基金
National Natural Science Foundation of China(41871349)
The Strategic Priority Research Program of the Chinese Academy of Sciences(XDA19040301)。
