湖北省1991年度柑桔冻害与避冻栽培区划

THE FREEZING DAMAGE OF CITRUS OF HUBEI PROVINCE IN 1991 AND THE DIVISION OF FREEZING-AVOIDING CULTIVATION

文章研究了湖北省各地１９９２年柑桔单产的减产率与１９９１年１２月最低气温的关系，发现两者之间是一种指数相关关系，它能较好地解释冻害程度与最低气温的关系．用Ｇｕｍｂｅｌ分布计算了５９个台站５、１０、２０、２５和５０年一遇的最低气温．并根据各地不同的１０年一遇最低气温，将湖北省分成适宜、次适宜和不适宜柑桔种植区，为柑桔避冻栽培提供了科学依据．

By examining the relationship between decreasing rate of orange yield per unit area in 1992 and the minimum temperature in December 1992 in various regions of Hubei Province, it is found that there is an exponential correlation. So, the relationship between the freezing damage degree of citrus and the minimum temperature can well be explained. By using Gumbel distribution,the minimum temperature once every 5, 10, 20' 25 and 50 years are calculated for 59 stations. Furthermore, according to various minimum temperature once in a decade in different regions of Hubei Province,the areadivision between optimum, sub-optimum and no-optimum for planting orange in Hubei Province is given. Therefore, the scientific basis for freezing-avoiding cultivation is provided.