湖北省一季中稻籼改粳气象条件利弊分析

摘要

提本文在试验基础上，利用统计分析和模型模拟的方法，分析了湖北省一季中稻籼改粳气候资源利用率、高温热害和低温冷害风险变化，分析了湖北省一季中稻籼改粳适宜品种、适宜播期，提出了若干建议。主要结论有：（1）湖北省一季籼改粳能进一步提高气候资源利用率；（2）籼改粳后抽穗开花期遭遇高温热害的风险增加、低温冷害风险降低；（3）在中稻供试品种中，甬优1540（籼粳杂交）是籼改粳最适宜的品种，热粳优35、中稻1号在各生态区适应性均不如甬优系列；（4）北部地区一季粳稻播期应安排在4月下旬，南部地区播期安排在5月上中旬，能保证80％的年份抽穗—开花避开高温热害高风险期。%Based on field experiments,statistical analysis and modelling were carried out to investigate the changes of climatic resources utilization,risk of heat and chilling stress as well as suitable varieties and so-wing date for single season rice to switch from indica to japonica type in Hubei Province.The results showed that changing rice from indica to japonica type can improve resource efficiency of climate,and re-duce the risk of chilling injury during heading period,but increase heat stress.Among five tested culti-vars,Yongyou1540 (indica-japonica hybrid)shows the best suitability across all ecological regions,while the performance of Rejingyou35 and Zhongdao1 is less satisfactory or with less suitability than Yongyou varieties.It is concluded that rice of japonica type should be sowed in the last ten-day period of April in the northern part of Hubei,and in the early and middle May in the southern part.Sowing in this window, 80% of the years could avoid heat stress during heading period.