湖南冬季暖区的研究

本文是通过广泛深入的考察,调查研究和资料分析,提出了三个问题:一是暖区的环境条件分析.从不同地形,群山与孤山,不同地貌,距山体、水域的远近,方位,防护林等的防寒避冻效应进行了论述;二是暖区划分依据与指标.采用了本省有代表性的生物学下限温度,以最低五年极低气温平均值与越冬安全指数作主导指标,以不同等级的临界低温及其出现频率为辅助指标.将暖区分为四级;三是暖区的分级评述.我省暖区共116个(包括片、区、块)占全省土地面积27.02％,其中一级暖区为3.41％、二级暖区6.83%、三级暖区10.07％、四级暖区6.71％.

RESEARCH INTO WINTER WARM REGION IN HUNAN PROVINCE

In this paper, three problems are studied with an extensive investigation and the analysis of a great quantity of data. The first problem is the environmental factors for the formation of winter warm region. This article el the effect of the prevention of frostbite and the shelter-forest of the different landforms and topographic features including mountain group, isolation mountain, waters and the position. The second is the reason and indexes for the division of winter warm region. The winter warm region is divided into four parts according to the typical min-temperature about the biology in our province and the average value of absolute annual minimum in five years in which the temperature is the lowest. The article uses the safety index of overwintering crop as leading index, the grade and frequency of critical lower temperature as auxiliary index. The last is gradational evaluation of warm region. There are 116 winter warm regions in our province.They occupy 2(?).62 percent of the whole provincial land, of which the first grade winter warm region is 3.41%, the second, 6.83%, the third, 10.07% and the fourth, 6.71%.