关键词: 土壤理化性质, 土壤理化性质

Abstract: In order to avoid or to provide the scientific basis for reducing frost effects on fruit tree or loss, climate characteristics and frost tin- depth understanding of Houma city from 1983 to 2012, the Houma Meteorological Bureau ground meteorological observation of hoarfrost, ground temperature, air temperature data, by means of mathematical statistics, climate tendency rate method, linear fitting method, to Houma City hoarfrost and frost climate characteristics of statistical analysis. The results show that, Houma city average annual frost was 94 days; the frost appeared on most of the year in 1995 (115 days), the least year in 1983 (63 days); Houma City, the average first frost date is October 23rd, the average last frost date was April 4th; first frost date showing a slightly later trend, climate tendency rate is 0.22 d/10 a, the last frost date also showed the later trend, climate tendency rate 2.34 d/10 a. The last frost date at the end of 4 early or mid April, fruit trees have different degrees of frostbite, if south the cold air temperature pelter, most fruit is likely to crops. So does the last frost forecast, timely take defensive measures, frostbite can avoid or reduce the fruit, so as to minimize the loss of fruit.