Response of Radial Growth to Abrupt Warming of Picea meyeri in Saihanba
To explore the response of radial growth of Picea meyeri to a sudden temperature increase,this study focused on natural forests of Picea meyeri in the Saihanba region.Based on the Breast Height Area Increment(BAI)of Picea meyeri,the Mann-Kendall test was employed to determine the timing of the temperature increase.Additionally,the drought years were identified based on relevant drought data.The radial growth pattern of Picea meyeri after the temperature increase in Saihanba and their correlation with monthly climate data were analyzed.Furthermore,the ecological resilience of Picea meyeri to extreme drought events is compared.Research shows that:① The annual average temperature in Saihanba area experienced a warming abrupt change in 1987.After the abrupt change,the annual average temperature showed a significant increasing trend(0.24 ℃/10 a),significantly higher than that before.② After the abrupt change,the BAI of Picea meyeri showed a decreasing trend,but it was not significant relationship.③ After the abrupt change,the Picea meyeri was exposed to drought stress to a cer-tain extent,which was significantly negatively correlated with the temperature in December 1986.the radial growth of Picea meyeri was negatively correlated with the mean temperature.④ After the abrupt temperature change,three drought events(2001-2002 mid-drought,2006-2010 severe drought and 2015 severe drought)occurred in Saihanba area.There was no significant difference in the resistance to the drought events,but the recovery and the resilience of Picea meyeri declined significantly.
万方数据
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