文献类型：期刊文献

中文题名：气候和密度对刺槐径向生长和干旱脆弱性的影响

英文题名：Effects of climate and density on the radial growth and drought vulnerability of Robinia pseudoacacia

作者：管崇帆[1,2] 郑京生[1,2] 李雅婧[1,2] 张蓝霄[1,2] 胡美均[1,2] 张劲松[1,2] 孟平[1,2] 孙守家[1,2]

第一作者：管崇帆

机构：[1]中国林业科学研究院林业研究所/国家林草局林木培育重点实验室,北京100091;[2]南京林业大学南方现代林业协同创新中心,南京210037

年份：2023

卷号：43

期号：8

起止页码：3261-3272

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：国家重点研发计划项目(2020YFA0608101)。

语种：中文

中文关键词：刺槐;密度;径向生长;气候响应;干旱脆弱性

外文关键词：Robinia pseudoacacia;density;radial growth;climate response;drought vulnerability

分类号：S792.27

摘要：为评估气候和竞争对刺槐径向生长、抗性和弹性的影响,使用年轮气候学方法建立河南省民权和济源不同密度刺槐的生长年表,确定不同密度刺槐径向生长与气象因子的关联,利用胸高断面积增量变化获得干旱事件前后不同密度刺槐的干旱脆弱性,旨在确定气候和密度对刺槐径向生长和干旱脆弱性影响。结果表明:在生长前期,不同密度刺槐的径向生长无显著差异,随着树木的生长,高密度刺槐的年轮宽度和胸高断面积增量(BAI)开始显著低于低密度(P<0.05)。Pearson相关分析结果显示,生长季的标准化植被蒸散指数、降水、相对湿度、温度和饱和水汽压亏缺是影响刺槐生长的重要因素。路径分析结果显示降水和温度是年尺度上影响刺槐生长关键因素。受干旱事件的影响,刺槐的年轮宽度和BAI均下降,低密度刺槐恢复力、弹性、相对弹性均显著高于高密度(P<0.05),在第1次干旱事件发生后,不同密度刺槐均恢复生长,但无法恢复到干旱前的生长水平。在多次干旱事件后,高密度刺槐相对弹性趋于或小于0,表明受多次干旱影响,其生长不能恢复到干旱前水平。随着时间的推移,济源刺槐在经历3次干旱后仍保留一定的弹性,但民权高密度刺槐在第2次干旱事件后相对弹性出现丧失,在未来干旱中其死亡风险增加。研究结果为研究气候对暖温带刺槐生长的影响提供了重要见解,并为密度影响下的刺槐恢复力和弹性研究提供了新视角。
The aim of this study was to evaluate the effects of climate and competition on the radial growth and drought vulnerability of Robinia pseudoacacia(locust).Dendroclimatology was used to characterize the recovery,resilience,and chronology of locust in two sites varying in tree density(Minquan and Jiyuan,Henan Province).The correlations between the radial growth of locust and meteorological factors were determined,and the drought vulnerability of locust during drought periods was estimated by measuring the breast area increase(BAI).There was no significant difference in the radial growth of locust at sites varying in locust density in the early growth stage.The ring width and BAI of locust became increasingly lower at the high-density site than at the low-density site with growth(P<0.05).Pearson correlation analysis revealed that the standardized precipitation evapotranspiration index,precipitation,relative humidity,temperature,and the saturated vapor pressure deficit were important factors affecting the growth of locust during the growing season.Path analysis revealed that precipitation and temperature were the key factors affecting the annual growth of locust.The ring width and BAI of locust decreased under drought,and the recovery,resilience,and relative resilience of locust were significantly higher at the low-density site than at the high-density site(P<0.05).The growth of locust at both sites recovered after the first drought event,but growth did not return to its pre-drought level.After several drought events,the relative resilience of locust at the high-density site was equal to or less than 0,indicating that its growth did not return to the pre-drought level because of the multiple drought events.Locust at the low-density site still exhibited high resilience after three droughts;however,the relative resilience of locust at the high-density site decreased substantially,and the risk of death under future droughts increased after the second drought event.Overall,our findings provide the important insights into the effect of climate and density on the growth of locust in warm temperate areas as well as a new perspective on the study of locust recovery and resilience.