老爷岭红松和胡桃楸径向生长对气候变化的响应

Radial Growth of Pinus koraiensis and Juglans mandshurica in Response to Climate Change in Laoyeling Mountains

为研究老爷岭地区红松和胡桃楸径向生长对气候变化的响应,采集红松(Pinus koraiensis)和胡桃楸(Juglans mandshurica)生长轮样品,建立年表进行分析。结果表明:红松和胡桃楸径向生长对气候的响应存在差异,红松径向生长与当年生长季和6月的平均温度、平均最高温度呈极显著负相关(p<0.01),与相同时间段降水呈极显著正相关,径向生长还与上年9月的最高温度呈显著正相关(p<0.05);胡桃楸径向生长与上年秋季、冬季和上年9、11月的降水呈显著正相关。1980年开始的快速升温,导致红松生长减缓,胡桃楸生长加速。快速升温后,生长季和当年6、7月温度对红松生长抑制作用增强,降水对红松生长的促进作用增强;上年秋季和上年9月温度对胡桃楸生长的促进作用增强,降水对胡桃楸的促进作用减弱。研究表明,升温加剧造成的干旱胁迫抑制了红松生长,而升温导致的胡桃楸光合能力增强和生长季延长促进了其生长。

In order to study the response of radial growth of Pinus koraiensis and Juglans mandshurica to climate change in Laoyeling Mountains,we collected tree ring samples and established the chronology,analysis the relationship between tree ring width chronology and climatic factors.The radial growth of P.koraiensis significantly negatively correlated with the mean and maximum air temperature in June and growing season of current year(p<0.01),but significantly positively correlated with the precipitation during the same time,and positively correlated with maximum air temperature in September of previous year(p<0.05).The radial growth of J.mandshurica was significantly positively correlated with the precipitation in September and November and autumn and winter season of the previous year.The radial growth of P.koraiensis decreased after the rapid temperature increase since 1980,while radial growth of J.mandshurica increased.Beginning in 1980 s,the inhibition effect of temperature in June and July and growing season on P.koraiensis growth increased significantly,while the promotion effect of precipitation on growth increased significantly at the same time.On the contrary,the promoting effects of temperature in September and autumn of last year on J.mandshurica increased,while the promoting effect of precipitation decreased.Our result reveals that drought stress induced by temperature increase inhibited the growth of P.koraiensis,while rapid warming contributed to the increase in growth rate of J.mandshurica through enhancing photosynthetic capacity and prolonging growth season.