作　　者： ; ; ; ; ; ; ;

机构地区： 云南省森林灾害预警与控制重点实验室

出　　处： 《云南大学学报（自然科学版）》 2014年第3期433-438,共6页

摘　　要： 近年来云南发生干旱,造成不同面积的云南松林受损.松针水势是反映松树体内水分状况的一个重要指标,可在一定程度上反映松树水分代谢能力,与松树生长发育及抗逆程度密切相关,也是探索水分胁迫对树木抗性影响的主要参数之一.作者跟踪测定了旱季不同阶段云南松松针水势的日变化,检测了云南松树冠各层松针水势变化规律,研究了松针水势变化与光照、温度、湿度变化之间的关系.研究表明,松针水势日变化总体呈白天低夜间高的基本格局,其在6—8时达到最高值,下午14时出现最低值.松针水势因松枝所在树冠高度略有不同,大体是随树冠高度层下降而升高.研究揭示,松针水势日变化受光照、温度和湿度等因素影响,与光照、温度呈负相关,与湿度呈正相关. The pine forests were damaged in various degrees because of the drought in Yunnan Province in recent years. Water potential of pine needle is an important index of water content of pine trees, which reflects the water metabolism of pine trees to a certain degree. Pine needles＇ water potential is closely related to the pine trees＇ growth and adversity resistance and is one of the main parameters for estimating how water stress influences the drought resistance of the trees. The daily fluctuation of water potential in needles from different positions of Yunnan pine （Pinus yunnanensis Franehet） trees was measured during different stages of a dry season in this study. The relationships between needles＇ water potential and the changes of illumination, temperature or humidity were also analyzed and discussed. The results indicated that the diurnal variation of needles water potential was affected by biotic and abiotic factors such as trees height, illumination, temperature and humidity. The results also showed that needles water potential was positively correlated to humidity, but negatively correlated to tempera- ture ,illumination and the pine needles＇ positions on a tree. The water potential had a diurnal decrease and a noc- turnal increase, which peaked from 6 a. m to 8 a. m and declined to the minimum at 2 p. m.

关 键 词： 云南松 水势 环境胁迫

领　　域： [农业科学] [农业科学] [农业科学]