基于VS模型的樟子松人工林径向生长过程及其气候响应

Study on Radial Growth Process and Climate Response of Pinus sylvestris var.mongolica Plantation Based on VS Model

【目的】利用模型模拟辽宁省章古台地区樟子松(Pinus sylvestris var.mongolica)人工林径向生长过程,探究气候对树木径向生长速率及生长季始末的影响。【方法】选择基于树木年轮生长生理过程的Vaganov-Shashkin模型(VS模型),模拟科尔沁沙地南缘章古台地区的36、52和58年生人工樟子松林的径向生长过程。【结果】VS模型模拟的3个林龄樟子松的轮宽序列与实测值的相关性较高,相关系数分别为0.717、0.748和0.655。利用VS模型进一步分析了樟子松年轮径向生长的生理过程,发现生长季开始与结束时的樟子松生长主要受温度限制,在生长旺盛期主要受土壤湿度影响,土壤湿度也是引起特征窄轮年树木生长速率较低的主要因素;低林龄樟子松林(36年生)要求的温度和水分条件更低,生长季更长,生长速率更大,在生长季内还存在着受温度限制的短暂时期。【结论】VS模型可成功用于研究不同林龄樟子松的生长过程,通过建立樟子松人工林年表与气候响应,发现生长季始末受温度影响,旺盛期的限制性因子为土壤湿度,生长季长短则影响宽窄轮形成。研究结果将有助于我国北方沙区人工樟子松林的气候适应性管理。

【Objective】Our aim was to simulate the radial growth process of Pinus sylvestris var.mongolica artificial forests in Zhanggutai,Liaoning Province,to reveal the effects of climate on the radial growth rate of trees and the beginning and end of the growing season.【Methods】Based on the tree-ring records of P.sylvestris var.mongolica at three samples in Zhanggutai area,the Vaganov-Shashkin model was used to simulate the radial growth process of 36,52 and 58-year-old P.sylvestris var.mongolica artificial forests in Zhanggutai area,southern margin of Horqin Sandy Land.【Results】The results showed that higher correlation between simulated and measured ring width sequence of P.sylvestris var.mongolica in 3 forest ages by VS model,and the correlation coefficients were 0.717,0.748,0.655.The physiological process of radial growth of P.sylvestris var.mongolica was further analyzed by VS model.It was found that the growth of P.sylvestris var.mongolica was mainly limited by temperature at the beginning and end of the growing season,and was mainly affected by soil moisture during the vigorous growth period.Soil moisture was also the main factor causing the low growth rate of trees in characteristic narrow-ring years.The low stand age P.sylvestris var.mongolica forest(36 years old)had lower requirements for temperature and water,longer growing season and higher growth rate.There was still a short period of temperature limitation in the growing season.【Conclusion】The VS model can be successfully used to study the growth process of P.sylvestris var.mongolica with different forest ages.The beginning and end of the growing season are mainly affected by temperature,and the main limiting factor of vigorous growth period is soil moisture,by establishing the chronology and climate response of P.sylvestris var.mongolia plantation.The length of the growing season affects the formation of wide and narrow rings.The results will contribute to the climate adaptive management of artificial P.sylvestris var.mongolia forests in the sandy areas of northern China.