论文部分内容阅读
为了弄清树木径向生长对气候响应的稳定性及其海拔差异,本研究以长白山自然保护区北坡3个海拔(1200 m(低海拔)、1400 m(中海拔)和1600 m(高海拔))的鱼鳞云杉(Picea jezoensis var.komarovii)为研究对象,利用年轮学方法分析了其径向生长的年际变化与气候的关系及其动态。结果表明,鱼鳞云杉的总体气候敏感度不高,在0.12~0.16之间,相比较而言,低海拔鱼鳞云杉的气候敏感度较大。鱼鳞云杉径向生长主要与5月的最高温度呈正相关,而中、低海拔鱼鳞云杉还与当年5月降水呈显著负相关。在3个海拔,鱼鳞云杉径向生长与气候的关系都不是稳定的。自1986年以来,5月平均最高温度表现出降低的趋势,导致高海拔鱼鳞云杉生长与5月温度的相关性减弱,且敏感性由显著相关到不相关的转折点位于5月均温的11.8℃,最高温度的19.9℃;中、低海拔鱼鳞云杉与5月降水相关性增强主要受近年来5月份降水量增加的影响,相关性发生转折的5月降水量为72.2mm。本研究为鱼鳞云杉年轮气候重建、气候变化情境下的生长预测等提供了数据参考。
In order to find out the stability of the tree radial response to climate change and its difference in altitude, this study was conducted on the northern slope of Changbai Mountain Nature Reserve with 3 altitudes (1200 m (low altitude), 1400 m (middle altitude) and 1600 m )) Of Picea jezoensis var. Komarovii were studied by using the method of annual ring analysis of the relationship between the annual variation of radial growth and climate and its dynamics. The results showed that the overall climate sensitivity of spruce was not high, ranging from 0.12 to 0.16. In comparison, the climate sensitivity of spruce was lower in low altitude. The radial growth of Picea schrenkiana was mainly positively correlated with the maximum temperature in May, while the middle and low altitudes of Picea crassifolia also had a significant negative correlation with the May precipitation of that year. At 3 altitudes, the relationship between radial growth and climate is not stable. Since 1986, the average maximum temperature in May showed a decreasing trend, leading to a weakening of the correlation between the growth of spruce and altitude in May at high altitudes, and the sensitivity of the correlation between the significant and unrelated turning points was 11.8 ℃, and the highest temperature was 19.9 ℃. The correlation between the precipitation of middle-and lower-altitude scale spruce and May rainfall was mainly affected by the increase of precipitation in May and the rela- tionship took place in May. The precipitation in May was 72.2 mm. This study provides a data reference for the annual growth of Picea crassifolia, climate change and so on.