【摘要】 利用云南半帚孢测试了干季中云南松抗性的变化规律。结果表明,云南松抗性的相对强弱与降雨量及环境温度均表现出一定程度的负相关关系,相关系数分别为r=-0.7798和r=-0.4627,|r0.05|=0.811,P>0.05。在干季前期,温度较低,降雨量偏少,松树的针叶及韧皮含水量较低,伴生菌的生长力较低,云南松的抗性相对增强,这一时期内纵坑切梢小蠹危害较轻;而干季后期,温度逐渐升高,降雨量也有所增加,松树含水量较高,伴生菌的生长力增强,云南松的抗性相对减弱,因此该时期内纵坑切梢小蠹的蛀干危害较严重。更多还原

【Abstract】 This paper reports the resistance response of Yunnan pine （Pinus yunnanensis） to inoculation with Leptographium yunnanense,a pathogenic fungus associated with Tomicus piniperda attacking Pinus yunnanensis during the drought season in Kunming region.Results indicated that there is a certain negative relationship existed between the Yunnan pine’s resistance and precipitation,and environmental temperature,and the correlation coefficient is r=-0.779 8 and r=-0.462 7 respectively,|r_0.05|=0.811,P>0.05.In the earlier drought season,both the temperature and the precipitation are lower,and the water content of the Yunnan pine is also lower,under these conditions,the fungus’ growth and its virulence are weaker,the Yunnan pine’s resistance is relatively stronger,so the Tomicus attacks during this period is not serious;however,in the later drought season,the temperature rises gradually,and the precipitation also increases,so does the water content of Yunnan pine,under these conditions,the Yunnan pine’s resistance is relatively weaker,but the fungus’ growth and its virulence are relatively stronger,so during this period,the Tomicus attacks （especially trunk attacks） are very serious.These results are constant with the Tomicus attacks under the natural conditions,and could give a better reason for the spacial and temporal distribution of Tomicus attacks.更多还原