摘要
为探究林分密度和气候因子对蒙古栎径向生长的影响,利用树木年代学方法研究了不同林分密度调控(间伐)下次生蒙古栎林径向生长变化,并结合气象数据,分析了蒙古栎生长变化的驱动因子。结果表明:次生蒙古栎林径向生长受林分密度的影响显著。低密度原始林蒙古栎径向年均增长量为3.12 mm,2个中密度次生蒙古栎林分别为1.55和1.42 mm,高密度次生蒙古栎林为0.96 mm。20%的间伐强度对促进高密度(1900株·hm^(-2)以上)栎林径向生长恢复作用有限,而对于中等密度(1600株·hm^(-2))栎林效果显著。该地区蒙古栎径向生长主要对当年1月和2月的降水变化敏感。抚育间伐降低了蒙古栎径向生长对气候因子的敏感性。在未来暖干化的气候情境下,密度调控有利于减缓气候变化对蒙古栎生长的不利影响。
To explore the effects of stand density and climatic factors on radial growth of Quercus mongolica,we used tree ring chronology to examine the radial growth changes in a secondary Q.mongolica forest under different levels of stand density(thinning).The meteorological data combined with the driving factors of Q.mongolica growth were analyzed.The results showed that the radial growth of Q.mongolica was significantly affected by stand density.The mean annual radial growth of Q.mongolica was 3.12 mm in low-density virgin forest,1.55 and 1.42 mm in the two medium-density secondary forests,respectively,and 0.96 mm in high-density secondary forest.The thinning intensity of 20%had a limited effect on promoting the radial growth recovery of high-density forest(1900 trees·hm^(-2)),but had a significant effect on medium-density forest(1600 trees·hm^(-2)).The radial growth of Q.mongolica was sensitive to the precipitation changes in January and February of the current year.Thinning reduced the sensitivity of Q.mongolica radial growth to climate.Under scenarios of climate warming and drying,density regulation could be beneficial in mitigating the adverse effects of climate change on the growth of Q.mongolica.
作者
毛沂新
张慧东
王睿照
颜廷武
魏文俊
云丽丽
潘文利
尤文忠
MAO Yi-xin;ZHANG Hui-dong;WANG Rui-zhao;YAN Ting-wu;WEI Wen-jun;YUN Li-li;PAN Wen-li;YOU Wen-zhong(Liaoning Academy of Forestry Science,Shenyang 110032,China;Liaoning Institute of Economic Forestry,Dalian 116031,Liaoning,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2021年第10期3477-3486,共10页
Chinese Journal of Applied Ecology
基金
国家重点研发计划项目(2017YFD0600602-02)
辽宁省兴辽英才计划项目(XLYC1902015)
辽宁省农业科学院基本科研业务费计划项目(2021HQ1910)资助。
关键词
蒙古栎
径向生长
气候因子
间伐
林分密度
Quercus mongolica
radial growth
climatic factor
thinning
stand density
