摘要
为筛选出湖北省荆州市中稻种植的最适播期,利用DSSAT模型评估荆州市中稻生长季内高温和低温灾害发生变化规律及高温灾害对水稻产量的影响,拟通过播期调整降低该区域水稻生产的高低温灾害风险。采用DSSAT 4.5模型和近36年来逐日气象资料对1971—2006年荆州市中稻的高低温灾害风险及高温对产量的影响进行定量化评估,并确定该区域中稻种植的最适播期。结果表明,与1971—1986年相比较,1987—2006年荆州市中稻种植的发生热害与冷害的频率有增大趋势,而且受气候变化的影响,中稻有减产趋势;相比较1971—2006年7个播期的减产率以及原始模拟产量与调整模拟产量,最适播期选择在4月20—25日可一定程度上避开中稻在孕穗—扬花期遇到高温热害。在全球变暖的背景下,荆州市中稻最适播期为4月20—25日可有效避开中稻孕穗—扬花期的高温影响,为该区域中稻抗避高温栽培提供参考依据。
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 the high temperature influence on the middle-season rice in its -April 20th-April 25th could effectively avoid booting stage and flowering stage in Jingzhou City.This study provides reference for antihigh-temperature cultivation of middle-season rice in this region.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2017年第2期223-229,共7页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家科技支撑计划项目(2014BAK19B06-03)
国家自然科学基金项目(31270488
31501274)
主要粮食作物产业化湖北省协同创新中心开放基金项目(2015MS001)~~
关键词
高温热害
DSSAT模型
最适播期
水稻
high and low temperature
DSSAT model
optimum sowing date
rice
