杉木径向生长动态对气侯的响应

为了解南方亚热带季风气候条件下杉木径向生长对气候因子的响应机制，用径向生长测量仪于2017年7月-2019年7月进行监测，用Compertz函数对年内生长过程进行拟合，以21 d为窗口将日径向生长量与气候要素每隔1 d进行滑动相关分析。结果表明:1)杉木的径向生长于3月初开始大幅度增加，11月趋于稳定，其中4月的径向生长累积量最大，而生长速率在5月初达到最大值；2)径向生长量与生长季开始阶段(3-4月)、结束阶段(9-10月)的降水量呈显著正相关，与相对湿度呈显著正相关，与7-8月平均温度显著负相关。因此在生长季开始阶段适当加大灌溉力度能促进杉木的径向生长。

Radial Growth Dynamics of Cunninghamia lanceolata and Its Response to Meteorological Factors

Cunninghamia lanceolata is an important timber tree species in the southern China.In order to analyze the radial growth (RG) dynamics of C.lanceolata in subtropical monsoon climate and its responses to meteorological factors,the RG measurement instrument was used for monitoring from July 2017 to July 2019.Fitting with the Compertz function,the correlation between the rRG of the day and the climatic elements every other day with a 21-day window was discussed.The results showed that 1) the RG of C.lanceolata began to increase significantly in early March,and stabilized in November.The RG in April contributed the most,while the growth rate reached the maximum in early May.2) The RG in 2018 was significantly positively correlated with the precipitation from March to October and from September to October,and was significantly positively correlated with the relative humidity of other months except for July,and negatively correlated with temperature in July-August.Therefore,increasing irrigation at the beginning of the growing season can promote the RG of C.lanceolata.