长江中下游春季连阴雨问题分析

本文依据连阴雨划定的标准规定，对长江中下游地区多年来连阴雨的气候特点及其基本形成原因进行了分析。结果表明：（1）全域性连阴雨期年际变化大；（2）连阴雨在空间、时间上分布不均；（3）地形影响连阴雨频率变化规律；（4）春播期低温，杨花期高温是影响农业的直接原因之一。

Analysis of the Spring Rainy Weather for Several Days Running in the Middle and Lower Reaches of Changjiang River

This article,in accordance with the standards of the classification of the rainy wether for sevend days run ning, makes an investigation to find out the climate featvres and the essential conditions of thes rainy weather in the past years in the areas along the middle and lower reacher of changjiang River. The result form the investigation is as follws: (1 )Annual change of the duration of this kind of weather is great in the whole are. (2)The rain is net well distributed in space and time. (3)Torography plays a role in aflacting the occurence of this hind of weather. (4)The main source which affect the ag ricultural in this area is the irregular tempecatare which is low in the spring sowing time but very high in the flowering peri od.