西安地区灾害性天气对园林植物引种驯化的危害

西安地处秦岭北麓、渭水南岸的关中盆地中段，气候属典型的暖温带季风气候。随着近年来改革开放工作的深入，园林植物的引种工作也日益增多，但由于气候等因素的限制，使得引种工作存在一定困难。本文就西安地区园林植物受冻害和干热气候的影响进行了调查，初步统计受害植物隶属２０多科、５０多种。通过调查分析，我们认为：受害植物原产地的气候条件有一定共性，且与西安地区的气候条件特别是个别异常天气有一定差异，而受冻害和干热气候的危害，不同植物有其各自的特殊性。根据酉安的实际情况，我们提出以下解决办法：１．加强天气预报工作；２．根据不同植物的生物学习性和生态学特征，应加强人工管理；３．在相关季节或可能出现异常的年份，加强人工保护措施。

THE EFFECT OF DISASTROUS CLIMATE ON THE INTRODUCTION AND DOMESTICATION OF HORTICULTURAL PLANTS IN XI'AN AREA

Xi'an area is lacated on the middle part of Guanzhong basin between the north ofQinling Mountain and the south of Weihe River.Its climate belongs to monsoon climateof warm-teperate zone.In recent years, with the deepening of reform and opening to theoutside world,the introduction and domestication of horticulttlral plants come grown.But because of the limitation of the climate the difficulty of this task exists in many respects. This senely has investigated the effect of the chill and dry hot weather on horticultural plants in Xi'an area. They belong to about more than 20 families, 50 species.According to investigation and analysis, we think that the climatic conditions of originalplace of the damaged plants have something in common, and also they demonstrated thedifference with the climate of Xi'an area, especially some abnormal weather. Consideringthe characteristic of Xi'an area's climate, we suggest that:(1)Enhancing weather forecasting.(2)Serengthening management of the plants according to their biological and ecological characters.(3)It's necessary to take artificial measures in the relevant seasonsand the possibly abnormal years.