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选择川西地区代表性云杉(Picea asperata)人工纯林,研究了林分中不同生长状态云杉个体径向生长过程,建立了树轮标准年表(STD),揭示了径向生长与气候因子的关系.评估了林窗疏伐措施应用后的径向生长量释放效应.结果表明:(1)云杉个体径向生长过程可分为快速生长期(1982-1993)和生长减慢期(1994-2005)两个阶段,优势木年平均径向生长量显著大于劣势木;(2)云杉年轮指数与上一年10月平均气温、年蒸发量、年干燥度呈极显著负相关关系,年蒸发量是制约其径向年生长量的关键因子;(3)林窗模式疏伐措施显著促进了云杉个体径向生长,且生长释放效应在林窗边缘强于林内,优势木显著大于劣势木.综合说明通过小强度林窗疏伐措施,可有效改善林地环境,促进云杉生长,而优先疏伐被压的劣势木、最大限度保留优势木是优化小强度林窗疏伐方案的重要策略.
The Picea asperata plantation was selected to study the radial growth of individual spruce individuals in different growth stages in the western Sichuan. The tree ring standard chronology (STD) was established to reveal the relationship between radial growth and climatic factors The results showed that: (1) The radial growth of spruce individuals can be divided into rapid growth period (1982-1993) and growth retardation period ( 1994-2005), the average radial growth of dominant wood was significantly greater than that of inferior wood. (2) The annual index of spruce was significantly negatively correlated with the average temperature, annual evaporation and annual dryness in October last year Relationship and annual evapotranspiration are the key factors restricting the annual growth of radial. (3) The thinning measures of gap pattern significantly promote the radial growth of spruce individuals, and the growth and release effects are stronger at the edge of gap, Which is significantly greater than that of inferior wood. Comprehensive Description Through the thinning of forest and window thinning measures can effectively improve the woodland environment and promote the growth of spruce, and the priority is to open up the pressure of the inferior wood, to maximize the retention of dominant wood is to optimize the small-intensity thinning gap Important strategy of the program.