祁连山中部低海拔地区青海云杉径向生长的气候响应机制

利用生理模型开展树木径向生长的气候响应机制研究对理解树木生长的生理机制、预估气候变化情景下森林生态系统的变化、提供森林保护管理的建议有重要意义。以祁连山中部低海拔地区青海云杉树轮记录为依据,利用Vaganov-Shashkin模型模拟青海云杉(Picea crassifolia)的径向生长,探讨青海云杉径向生长的生理机制。结果表明:降水对祁连山中部低海拔地区青海云杉径向生长起着决定性作用,5—8月份的降水直接影响当年青海云杉的径向生长,9月份的降水量影响翌年青海云杉的径向生长。根据本研究结果,水分是限制青海云杉径向生长的主要因子,建议青海云杉人工林种植时,可在5—8月份对青海云杉增加灌溉量。

Climate response mechanism of radial growth of Picea crassifolia in low altitude area of middle Qilian Mountains

To study the climate response mechanism of tree radial growth using physiological models is important for understanding the physiological mechanism of tree growth, predicting changes of forest ecosystem in climate change scenarios, and providing suggestions for forest protection and management. Based on the tree-ring records of Picea crassifolia in the middle of the Qilian Mountains, the Vaganov-Shashkin model was used to simulate the radial growth of Picea crassifolia. The physiological mechanism of the radial growth of Picea crassifolia was also discussed. The results showed that precipitation was the main factor affecting the radial growth of Picea crassifolia in low altitude area of middle Qilian Mountains. Precipitation from May to August directly affected the radial growth of Picea crassifolia, and precipitation in last September also affected the radial growth of Picea crassifolia. It is suggested that the irrigation amount should be increased appropriately in May-August in afforestation of Picea crassifolia.