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在川西高原松潘县二道海林区的东南坡、西北坡和扎日寺林区的东坡用零信号法建立4条云、冷杉树轮年表,通过年轮-气候响应分析、多因素方差分析等方法研究不同坡向树木生长对快速升温的响应差异.结果表明:快速升温(1980年)后,东坡紫果云杉生长显著加速(0.011 a~(-1)),而西北坡紫果云杉生长则显著降低(-0.006 a~(-1)),东南坡紫果云杉和西北坡岷江冷杉生长降低,但不显著.随着快速升温,不同坡向云、冷杉径向生长与气候因子的关系均出现显著变化.快速升温后,生长季温度对东坡紫果云杉径向生长的促进作用显著增加,对东南坡和西北坡紫果云杉径向生长的抑制作用也显著增加,但生长季温度对西北坡岷江冷杉径向生长的影响在升温前后变化不明显.5月降水量对东坡紫果云杉径向生长由升温前的抑制作用变为升温后的显著促进作用,而对东南坡和西北坡紫果云杉径向生长的抑制作用显著增加,5月降水量对西北坡岷江冷杉径向生长的影响在升温前后变化不明显.树轮与帕尔默干旱指数响应分析表明,快速升温后,不同坡向的土壤湿度变化是造成树轮响应差异的重要原因.多因素方差分析表明,坡向与温度、降水的综合作用是影响紫果云杉径向生长的重要因素.因此,在模拟预测树木生长对气候变暖的响应动态时,应考虑不同坡向与温度、降水的综合作用.
On the southeast slope, the northwestern slope and the east slope of Zhari Temple in Erda Hailin district of Songpan County in the western Sichuan plateau, four clouds and fir tree round chronology were established by zero signal method. The annual ring-climate response analysis, multivariate variance (1980), the growth of Picea koraiensis on the east slope accelerated significantly (0.011 a ~ (-1)), while the northwest slope of the purple The growth of spruce declined significantly (-0.006 a -1), while the growth of spruce (Prunus mume) on the southeast slope and the growth of Abies faxoniana on the northwestern slope decreased but not significantly.With the rapid warming, And climatic factors showed significant changes.After the rapid warming, the growth season temperature on the radial growth of Picea obliquahii significantly increased the radial growth on the southeast and northwestern purple spruce radial growth inhibition also But the effect of growing season temperature on the radial growth of Abies faxoniana variegatus in northwestern slope did not change obviously before and after warming.May precipitation had a significant effect on the radial growth of the purple spruce on the east slope from warming to warming Promote the role, while on the southeast slope and northwestern slope purple cloud The radial growth inhibition significantly increased, and the effect of May rainfall on the radial growth of Minjiang River fir in the northwestern slope was not obvious before and after warming. Response analysis of the tree ring and Palmer drought index showed that after the rapid warming, The change of soil moisture is the important reason that causes the difference of tree ring response.Multivariate analysis of variance shows that the combination of slope and temperature and precipitation is the important factor that affects the radial growth of Picea koraiensis.Therefore, When responding to warming, we should consider the combined effect of different aspect and temperature and precipitation.