应用生态学报2025，Vol.36Issue(2)：411-417,7.DOI:10.13287/j.1001-9332.202502.002
健康与衰退樟子松和杨树径向生长响应气候及其生态弹性差异
Differences in radial growth responses to climate and ecological resilience between healthy and declining Pinus sylvestris var.mongolica and Populus L.
摘要
Abstract
With global climate warming and the alteration of precipitation regime,the Three-North Shelter Forest in China has been degraded in recent years,which is a primary challenge for shelterbelt construction.Our understan-ding of the physiological mechanisms behind forest decline remains limited.In this study,we employed dendrochro-nological methods to measure the basal area increment(BAI)and tree-ring width of both healthy and degraded Pinus sylvestris var.mongolica and Populus L.We developed corresponding standardized chronologies(STD)to analyze their responses to climatic factors and ecological resilience during drought periods,and to elucidate the mechanisms of degradation in P.sylvestris var.mongolica and Populus L.under climate change,as well as their differences in drought adaptability.The results showed that radial growth in healthy P.sylvestris var.mongolica had significantly increased since 1978,with higher mean BAI of healthy trees than the degraded trees.They both exhibi-ted a significant positive correlation with the annual palmer drought severity index(PDSI).Healthy P.sylvestris var.mongolica was less sensitive to precipitation and more resistant and resilient during drought periods.Since 1983,there had been no significant trend in radial growth for either healthy or degraded Populus L.,though the mean BAI of healthy Populus L.was significantly higher than that of declining trees.Healthy Populus L.trees exhi-bited weaker correlations with precipitation,PDSI,and vapor pressure deficit(VPD)compared to the degraded trees,yet they showed higher resistance and resilience during droughts.P.sylvestris var.mongolica showed signs of decline earlier than Populus L.and demonstrated greater sensitivity to the PDSI.Nevertheless,it exhibited higher resistance and resilience than Populus L.In conclusion,drought and precipitation emerge as the primary climatic factors contributing to the decline of P.sylvestris var.mongolica and Populus L.,with degraded trees being more sensitive to climate change.P.sylvestris var.mongolica demonstrated stronger adaptability to cumulative drought than Populus L.,making it more likely to survive under future scenarios of increased drought caused by climate war-ming.This study provided data support and scientific insights for species selection in the Three-North Shelter Forest Project.关键词
樟子松/杨树/三北防护林/森林衰退/生态弹性Key words
Pinus sylvestris var.mongolica/Populus L./the Three-North Shelterbelt/forest declining/ecological resilience引用本文复制引用
袁超峰,王文志,吴喆虹,苏勇,罗玲卓..健康与衰退樟子松和杨树径向生长响应气候及其生态弹性差异[J].应用生态学报,2025,36(2):411-417,7.基金项目
本文由国家自然科学基金项目(41977396)资助. （41977396）
