摘要
为探究升温突变对树木径向生长的影响,本研究以塞罕坝地区、庞泉沟地区、丰宁地区的华北落叶松天然林为对象,基于树木年轮学方法,利用Mann-Kendall检验升温突变发生时间,分析升温突变前后三地华北落叶松径向生长规律及其与月气候数据的相关关系。结果表明:塞罕坝地区、庞泉沟地区、丰宁地区发生升温突变的时间分别是1987年、1994年和1989年。升温突变前三地华北落叶松径向生长均无显著变化趋势;升温突变后塞罕坝地区华北落叶松径向生长显著下降(下降速率为0.08·10 a^(-1)),庞泉沟地区华北落叶松径向生长显著上升(上升速率为0.10·10 a^(-1)),丰宁地区无显著变化。升温突变前,塞罕坝地区华北落叶松径向生长与5、6月的月均最高温呈显著正相关;升温突变后,与7月降水量呈显著正相关,与上一年9月—当年7月标准化降水蒸散指数(SPEI)呈显著正相关。升温突变前,庞泉沟地区华北落叶松径向生长与各月气候因子无显著关系;升温突变后,其与前一年9月月均最低温呈显著正相关。升温突变前,丰宁地区华北落叶松径向生长与7月月均最低温呈显著负相关;升温突变后,其与6月月均温、月均最高温呈显著负相关。升温突变后塞罕坝地区华北落叶松径向生长受到干旱胁迫,未来若温度持续升高丰宁地区华北落叶松也将受到干旱胁迫,而升温有利于庞泉沟地区华北落叶松的径向生长。
To investigate the impacts of abrupt warming on tree growth,we collected tree ring cores from larch(Larix principis-rupprechtii)in three different sites,including Saihanba National Nature Reserve,Pangquangou National Nature Reserve,and Fengning Qiansongba National Forest Park.Based on the tree ring method,Mann-Kendall test was used to examine the occurrence time of temperature rise mutation.We further analyzed the radial growth law of larch before and after the temperature mutation and its correlation with the monthly climate data.The results showed that the sudden temperature rise occurred in the Saihanba area in 1987,the Fengning area in 1989,and the Pangquangou area 1994.Before the sudden warming,there was no significant trend for the radial growth in all the three regions.After the sudden warming,however,it decreased significantly(with a decrease rate of 0.08·10 a^(-1))in Saihanba area.The radial growth of larch increased significantly in Pangquangou area(with an increase rate of 0.10·10 a^(-1)),while no significant change was observed in the Fengning area.Before the sudden warming,there was a significant positive correlation between the radial growth of larch in the Saihanba area and the highest temperature in May and June.After the sudden warming,there was a significant positive correlation with precipita-tion in July,and a highly significant positive correlation with the standardized precipitation evapotranspiration index(SPEI)from September of the previous year to July.Prior to the sudden warming,there was no significant relationship between the radial growth of larch in the Pangquangou area and monthly climate factors.However,after the sudden warming,a significant positive correlation was found with the lowest temperature in September of the pre-vious year.Before the sudden warming,the radial growth of larch in Fengning area was significantly negatively correlated with the lowest average temperature in July.After the sudden warming,it showed a significant negative correlation with the average and highe
作者
王恒
王小雪
贾建恒
张子航
郭明明
WANG Heng;WANG Xiao-xue;JIA Jianheng;ZHANG Zihang;GUO Mingming(College of Forestry,Hebei Agricultural University,Baoding 071000,Hebei,China;Urban Forest Healthy Technology Innovation Center in Hebei Province,Baoding 071000,Hebei,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2023年第10期2629-2636,共8页
Chinese Journal of Applied Ecology
基金
河北农业大学引进人才专项(YJ201943)
河北省重点研发计划项目(22326803D)
河北省省属高等学校基本科研业务费研究项目(KY2022047)资助。
关键词
树轮
径向生长
升温突变
华北落叶松
tree ring
radial growth
temperature rise mutation
Larix principis-rupprechtii
