干旱胁迫对马占相思幼苗生长及生理特性的影响

打开文本图片集

中图分类号 S157.9 文献标志码A 文章编号 1007-7731（2026）07-0045-07

DOI号 10.16377/j.cnki.issn1007-7731.2026.07.012

Effects of drought stress on the growth and physiological characteristicsof Acacia mangium seedlings

Zhang Anqi1 Chen Chuanli²Chen Sanxiongl

（ 1 College of Horticulture and Landscape Architecture， Zhongkai University of Agriculture and Engineering， Guangzhou ， China; ²Guangzhou Shanshui Ecological Engineering Consulting Co.，Ltd.， Guangzhou ， China）

AbstractTo investigate the tolerance ofAcacia mangium todroughtstress，a potdrought experiment was conducted. The growth indicators （plant height），antioxidant enzymes [superoxide dismutase （SOD），catalase （CAT），peroxidase （POD）， malondialdehyde （MDA）content，smotic regulatory substances [proline （Pro），soluble sugar（SS），solubleprotein （SP）l， photosynthetic parameters [photosynthetic rate （Pn），transpiration rate （Tr）， intercellular CO concentration （Ci）， stomatal conductance（Gs）l，and chlorophyllcontentof cacia mangiumseedlings underdiferentdegrees ofwaterstress （droughtstressfor7，14，21，and28days）were measured.Correlationanalysisand principalcomponentanalysis wereused toanalyze themain influencing factorsofitsdroughtresistance.Theresultsshowedthatasthedegreeofdroughtstress increased，theincreaseinplantheightofAcacimangiumgradualldecreased，whilethectivitiesofSOD，thecotentsof MDA，SS，Ci and chlorophyllallshowed a trendoffirstdecreasingand then increasing.The activitiesof PODand photosyntheticparameterindicators （except Ci）allshowedadecreasingtrend，whilethecontentsofPro，SSandSPall showedanincreasing trend.Corelationand principalcomponentanalysis indicatedthatPro，chlorophyllb（Chlb）and SP could beusedasthe mainindicators forevaluatingthedroughtresistanceofAcacia mangium，whileSODand plantheight could be usedasauxiliary indicators.Inconclusion，moderatedroughtcanpromote theaccumulationofosmoticadjustment substances and the enhancement of antioxidant enzyme activity in Acacia mangium.

KeywordsAcacia mangium;drought stres;； photosynthesis; physiological characteristics； principal componentanalysis

马占相思（Acaciamangium）是华南地区常见的人工林树种，其具有生长迅速、树冠茂盛、固氮能力强和耐瘠薄等特点，在自然分布区内长期处于野生状态，能快速占据可供更新的荒山或采伐迹地，在瘠薄土地上也能生长成林[1-2]。（剩余8136字）