祁连山青海云杉径向生长对气候的响应
Climate response of radial growth of Picea crassifolia in Qilian Mountains of northwestern China.
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摘要: 为探明树木径向生长对气候变化的响应，以祁连山中部下限青海云杉为研究对象，采用年表气候相关分析和特征年分析方法，研究了青海云杉的年轮宽度、早材宽度、晚材宽度标准化年表与月均温度和降雨量的关系。结果表明：年轮宽度、早材宽度、晚材宽度与6、7月的月均温度显著负相关。年轮宽度、早材宽度与3、5、6月的降雨量显著正相关，与9月的降雨量显著负相关；晚材宽度与降雨量无显著相关，晚材宽度对气候的敏感性弱于早材宽度。特征年分析进一步发现：当夏季温度高于同期温度而夏季降雨量又低于同期降雨量时，容易形成窄年轮；相反，当夏季温度低于同期温度而夏季降雨量又高于同期降雨量时，容易形成宽年轮。表明春季和夏季降雨量对祁连山中部下限青海云杉的径向生长有促进作用，而夏季温度有抑制作用。Abstract: To investigate the climate response of radial growth of Picea crassifolia at the lower tree line in the middle Qilian Mountains, northwestern China, relationships of standardized chronologies of annual, earlywood and latewood width to monthly mean temperature and monthly total precipitation were analyzed by methods of correlation and pointer year analysis. The results of the relationship between chronologies and temperatures and precipitation showed that width of annual ring, earlywood and latewood were significantly negatively correlated with monthly mean temperature in June and July. Annual and earlywood width were significantly positively correlated with monthly total precipitation in March, May and June, and negatively correlated with monthly total precipitation in September. Earlywood width was more sensitive to climate than latewood width, which was insignificant with precipitation. The results of pointer year analysis revealed that the summer temperatures in years when narrow rings formed were higher than the mean summer temperatures synchronization, while the summer precipitation in those years was lower than mean summer precipitation synchronization, and the reverse was also true in years when large rings were formed. The results indicate that more precipitation in spring and summer is helpful for radial growth while warmer summer restricts the radial growth of P. crassifolia at the lower tree line in the middle Qilian Mountains, northwestern China.
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Keywords:
- Qilian Mountains /
- Picea crassifolia /
- annual ring width /
- earlywood width /
- latewood width /
- climate response
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