【摘要】 基于小兴安岭红松的树轮资料,确定了Tree-Ring生态机理模型模拟红松树木生长的参数。应用Tree-Ring模型对小兴安岭红松的生长过程进行了模拟,结果显示Tree-Ring模型在该地具有较好的适用性。参数敏感性分析表明红松树木生长比较敏感的参数是光合最低温度、光合最适温度下限、最适土壤体积含水率上限和最大土壤体积含水率。模拟发现,红松树轮宽度变化主要受到生长季上一年10月份气温和当年4月份气温变化控制。形成层开始生长平均是在4月下旬,这时水分充足,而温度在光合最低温度和最适温度下限之间,温度愈高,光合速率愈大,储存的养料愈多,因此表现为与树轮宽度的正相关关系。形成层生长结束的时间平均在10月上旬,用于形成层细胞生长的光合产物的消耗减少,而光合速率随着温度的升高而增大,因此,10月份的气温越高为下一年储存的养料越多,翌年易形成宽轮。更多还原

【Abstract】 Tree-Ring width data may reflect a nonlinear response to multivariate climate forcing. Thus,statistical relationships which may represent linearization of nonlinear processes are difficult to validate outside the instrumental era. Moreover,traditional statistical techniques are inadequate when describing tree-growth responses to climate on cellular level. In this paper,we use the Tree-Ring model to simulate climatic response of Pinus koraiensis in the lower mountains of XiaoXing’AnLing.A comparison between simulated and measured Tree-Ring series shows that the Tree-Ring model could model the Pinus tree-growth accurately. Sensitivity analysis indicated that the Tree-Ring growth is sensitive to minimum temperature for photosynthesis,lower optimal temperature for photosynthesis,upper optimal volumetric water content and maximum volumetric water content. Furthermore,the simulation results indicated that variations in Tree-Ring width are mainly controlled by October temperatures of the year prior to growth and April temperatures of the growth year. Cambium growth begins in the last ten-day of April when there is enough water,but temperatures are low in XiaoXing’AnLing,and cambium growth ends in the first ten-day of October,but temperatures of October are between Lower optimal and minimum temperature for photosynthesis,where the photosynthesis speed rate increases at higher temperature. Thus,the higher October temperature,the more is food storage,and the wider is the ring of the next year.更多还原