1　前言近些年来 ,大量发展了早芽型的优良品种茶园。但是江苏冬季气温较低 ,倒春寒频频发生 ,茶树易受冻害 ;夏季气温高、雨水少、茶树易受旱害。另外茶园土壤较粘重 ,茶树根系生长不良 ,加上无性扦插苗本身根系浅。茶树容易受气象灾害的影响 ,使茶树的经济年限缩短 ,茶叶的产 1 Introduction In recent years, a large number of early bud-type varieties of tea plantations have been developed. However, the temperature in winter in Jiangsu is rather low, and it occurs frequently in late spring. Tea trees are susceptible to frost damage. In summer, the air temperature is high, and there is little rainwater. Tea trees are susceptible to drought. In addition the tea garden soil more sticky, poor growth of tea roots, coupled with asexual cutting seedlings itself root shallow. Tea trees are easily affected by meteorological disasters, shortening the economic life of tea trees and producing tea