Cultivar selection can increase yield potential and resource use efficiency of spring maize to adapt to climate change in Northeast China  

作　　者：SU Zheng-e LIU Zhi-juan BAI Fan ZHANG Zhen-tao SUN Shuang HUANG Qiu-wan LIU Tao LIU Xiao-qing YANG Xiao-guang 

机构地区：[1]College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,P.R.China [2]Chinese Academy of Meteorological Sciences,Beijing 100081,P.R.China

出　　处：《Journal of Integrative Agriculture》2021年第2期371-382,共12页农业科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2016YFD0300101-03)。

摘　　要：Northeast China (NEC) is one of the major maize production areas in China.Agro-climatic resources have obviously changed,which will seriously affect crop growth and development in this region.It is important to investigate the contribution of climate change adaptation measures to the yield and resource use efficiency to improve our understanding of how we can effectively ensure high yield and high efficiency in the future.In this study,we divided the study area into five accumulated temperature zones (ATZs) based on growing degree days (GDD).Based on the meteorological data,maize data (from agrometeorological stations) and the validated APSIM-Maize Model,we first investigated the spatial distributions and temporal trends of maize potential yield of actual planted cultivars,and revealed the radiation use efficiency (RUE) and heat resource use efficiency (HUE) from 1981 to 2017.Then according to the potential growing seasons and actual growing seasons,we identified the utilization percentages of radiation (P_R) resource and heat resource (P_H) for each ATZ under potential production from 1981 to 2017.Finally,we quantified the contributions of cultivar changings to yield,P_R and P_H of maize.The results showed that during the past 37 years,the estimated mean potential yield of actual planted cultivars was 13 649 kg ha^(–1),ranged from 11 205 to 15 257 kg ha^(–1),and increased by 140 kg ha^(–1) per decade.For potential production,the mean values of RUE and HUE for the actual planted maize cultivars were 1.22 g MJ^(–1) and 8.58 kg (℃ d)^(–1) ha^(–1).RUE showed an increasing tendency,while HUE showed a decreasing tendency.The lengths of the potential growing season and actual growing season were 158 and 123 d,and increased by 2 and 1 d per decade.P_R and P_H under potential production were 82 and 86%,respectively and showed a decreasing tendency during the past 37 years.This indicates that actual planted cultivars failed to make full use of climate resources.However,results from the adaptation assessments

关 键 词：APSIM maize potential yield radiation use efficiency resource utilization percentage cultivar selection 

分 类 号：S513[农业科学—作物学] S162.3