樟子松针叶气孔运动与蒸腾强度关系研究

STUDY ON THE RELATIONSHI BEWTEEN STOMATAL MOVEMENT AND TRANSPIRATION RATE OF MONGOLIA SCOTCH PINE

本文分析了影响樟子松针叶气孔阻力的主要环境因子及气孔运动与樟子松蒸腾强度、针叶水势的关系。结果表明：光合有效辐射是影响樟子松针叶气孔阻力的主要环境因子，其次是相对湿度，最后是空气温度。气孔关闭是针叶蒸腾强度下降的主要原因，它决定于针叶水势的一个临界值。统计分析表明，２龄针叶气孔关闭的水势临界值在－１６．８ｂａｒ，左右，而１龄针叶气孔关闭的水势临界值至少不在－１２．８－－１９．３１ｂｅｒ之间。

In this essay,the environmental factors affecting stomatal resistance and the relationshipsbewteen stomatal movement,needle leaves and transpiration rate of Mongolia scotch pine wereanalysed.The results showed that:Available radiation is the main factor affecting stomatal resistance,followed by relative humidity and air temperature,That stomatal begins to close is the main reason fortranspiration rate declining.Whether the stomatal begins to close or open is determined by a criticalvalue of leave water potential which is at-16. 8 bar for two-year old leaves and is not in the range of-12.83 to-19. 31 bar for one-year old leaves of Mongolia scotch pine.