超级杂交稻制种基地气候风险的细网格分析

[目的]避免和减轻超级杂交稻制种气候风险。[方法]应用数理统计方法建立气候要素值与地理要素值之间的关系模型,确定不同时段温度递减率,然后根据超级杂交稻制种基地气候风险等级指标,结合细网格点的纬度、经度和海拔高度等地理信息数据,进行细网格推算和分析。[结果]当不育系的育性转换临界温度指标为23.5℃时,其无风险制种区域主要分布在祁东、祁阳、常宁、耒阳及阳明山以南的道县、宁远、新田、临武、宜章等地,面积约0.8万km2;低风险区主要分布在湘中及湘东,面积约5.9万km2。[结论]该研究为超级杂交稻制种基地布局提供科学依据。

Small Grid Analysis of Climate Risk for Seed Production Base of Super Hybrid Rice

[Objective]The aim was to avoid and reduce the climate risk for seed production base of super hybrid rice.[Method] Establish relational models of climatic element value with feature value by using the mathematical statistic method,and determine different time interval lapse-rate of temperature.According to climate risk index for seed production base of super hybrid rice,union fine-structure mesh geography message data and so on grid point's latitude,longitude and altitude above sea level,carry out the thin grid calculation and the analysis.[Result] When the male-sterile critical temperature index is 23.5 ℃,the non-risk regions for seed production base of two-line super hybrid rice mainly distribute in Qidong,Qiyang,Changlin,Leiyang,Daoxi,Ningyuan,Xintian,Linwu and Yizhang,and the area is 8 000 square kilometer approximately.The low risk areas mainly distribute in middle and eastern part of Hunan,and the area is 59 000 square kilometer approximately.[Conclusion] The study provides the scientific basis for seed production base of super hybrid rice.