Simulation of the Influence of High and Low Temperature Disasters on Middie-season Rice Production in Jingzhou Based on a DSSAT Model and some Countermeasures
In order to select the optimum sowing period for middle-season rice in Jingzhou City,DSSAT model was used to evaluate the variation law of high and low temperature disasters in the growing season of middle-season rice in Jingzhou City and their impact on rice yield and reduce the risk of high and low temperature disasters to rice production in this region by adjusting the sowing date.A quantitative evaluation of the risk of high and low temperature disasters to the middle-season rice in Jingzhou City and the impact of high temperature an rice yield in the period from 1971-2006 was carried out by using DSSAT4.5 model and nearly 36 years'daily meteorological data.Then the optimum sowing date for the middle-season rice in this region was defermined.The result showed:Compared with that in the period from 1917 to 1986,the frequency of heat and chill injury to the middle-season rice in the period from 1987 to 2006 in this region had an ubcreasubg trend,which caused reduced yield;compared with the yield-reducing rate of 7 sowing dates in the period from 1917 to 2006 and the initial simulated yield and adjusted simulated yield,the sowing date in the period from April 20th to April 25th could avoid the high temperature damage to middle-season rice in its booting stage and flowering stage.Under the background of global warming,the sowing date -April 20th-April 25th could effectively avoid the high temperature influence on the middle-season rice in its booting stage and flowering stage in Jingzhou City.This study provides reference for antihigh-temperature cultivation of middle-season rice in this region.