摘要
根据晚稻生长状况、受害程度与低温冷害强度关系,确定晚稻冷害等级指标;利用广西90个气象台站46年的气候资料和站点地理信息,采用GIS技术和数理统计回归分析以及气候资源的细网格推算方法,建立晚稻冷害的空间分析模型,推算出1km×1km分辨率的冷害指标因子空间分布;并根据晚稻冷害分级指标,通过GIS的空间分析能力,分析广西晚稻低温冷害的空间分布特征,得出广西无冷害和轻度、中度、严重冷害等四个区域的区划结果,制作广西晚稻低温冷害区划专题图,对分区结果进行评述并指出了冷害的战略防御和应急防御措施,为广西水稻生产的趋利避害和优化布局提供决策依据。
The climate in Guangxi is complex due to the environment in geographical location and terrains as well as the alternation of summer and winter monsoons.It resulted in frequent weather disasters such as cold damage.And the cold damage,especially the weather of cold dew wind,has been one of the main constraint factors for high yield rice in Guangxi.Therefore,it is necessary to carry out disaster division research into cold damage of the late rice in Guangxi by GIS.And this research is of practical significance to making science countermeasure of disaster prevention and mitigation,in promoting high and stable yield of foodstuff and in maintaining social harmony and stability. According to the relationship among late rice growth,the degree of injury and the intensity of cold damage,the grading indices of cold damage for late rice were analyzed and decided.Using the climatic data from 1961 to 2006 and geographical information data of 90 weather stations in Guangxi,space calculating models for the zoning index of cold damage are built by the regression method of mathematical statistics,supported by GIS technology and simulation analysis method of small grids models of climate resources,and the use of the basic Guangxi geographic data on a scale of 1：250000,calculation of small gridding and correction of error are operated for those zoning indexes.The actual distribution for the zoning index of cold damage is worked out on a small grid of l km×l km,which gives different values under different geographical conditions. Using the function of spatial analyses and multi-overlapping method of GIS,and according to the grading indices of cold damage,grid data of the zoning index are calculated in the climate zone by the method of scoring to sort out the kinds.Then the spatial distribution of cold damage for late rice in Guangxi was analyzed,which gave out the divisional result of cold damage： zero,light,moderate and serious degree,and the results of assessment for different cold damage regions were summarized.The map of cl
出处
《地理研究》
CSCD
北大核心
2010年第6期1037-1044,共8页
Geographical Research
基金
广西自然科学基金项目"水稻冷害的GIS监测预警技术研究"(0832204)
广西农业重点科技计划项目(200702)
广西科技攻关项目(0816006)
国家科技支撑计划项目(2008BADB8B01)
关键词
GIS技术
晚稻
低温冷害
灾害区划
GIS technology
late rice
cold damage
disaster zoning
