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为探明木材密度对气候变化的响应,以祁连山中部下限青海云杉为研究对象,利用Silviscan-3测定了青海云杉的木材密度,根据树木年轮气候学的标准方法建立了年轮密度、早材密度、晚材密度、最大密度、最小密度年表,分析了各个木材密度年表与月平均温度、最高温度、最低温度和月降雨量的关系。结果发现:木材密度与温度正相关,与降雨量负相关。年轮密度和早材密度与6、7、8、9月月均温度显著正相关,与6、7、9月月均最高温度显著正相关,与上年10月和当年7、9月月均最低温度显著正相关;最小密度与6、7、8月月均温度显著正相关,与6、7月月均最高温度显著正相关,与7月月均最低温度显著正相关;晚材密度和最大密度与温度不相关。年轮密度与3月月降雨量显著负相关,早材密度和最小密度与6月月降雨量显著负相关,晚材密度和最大密度与降雨量不相关,即晚材密度对气候的敏感性弱于早材密度。这表明温度对青海云杉木材密度有直接影响,降雨量有间接影响,夏季温度是影响青海云杉木材密度的主要气候因子。
In order to find out the response of wood density to climate change, the Qinghai spruce (Picea crassifolia) with the lower limit of central Qilian Mountains as the research object, the wood density of Picea crassifolia was determined by Silviscan-3, the annual ring density was established according to the standard method of tree ring climatology, Early wood density, late wood density, maximum density, minimum density chronology, the relationship between annual chronology and monthly mean temperature, maximum temperature, minimum temperature and monthly rainfall of each wood was analyzed. The results showed that the wood density was positively correlated with temperature and negatively correlated with rainfall. The annual density of annual rings and earlywood density were significantly and positively correlated with the monthly mean temperature in June, July, August and September, and positively correlated with the monthly mean maximum temperatures in June, July and September, There was a significant positive correlation between the minimum temperature and the minimum temperature. The minimum density was positively correlated with the monthly mean temperature in June, July and August, and positively correlated with the monthly mean maximum temperature in June and July, and positively correlated with the monthly mean minimum temperature in July. And the maximum density and temperature are not related. The annual ring density was significantly and negatively correlated with the monthly rainfall in March. The earlywood density and the lowest density were significantly and negatively correlated with monthly rainfall in June. Latewood density and maximum density were not correlated with rainfall, that is, the sensitivity of latewood density to climate Weaker than the early wood density. This shows that the temperature has a direct impact on the density of Qinghai spruce timber, rainfall indirectly affect the summer temperature is the main climate factor affecting the density of Qinghai spruce wood.