云南松幼苗生长及化学计量对遮阴和干旱互作的响应

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DOI：10.11931/guihaia.gxzw202405052

中图分类号：Q945.12 文献标识码：A 文章编号：1000-3142（2025）06-1161-14

Growth and stoichiometry of Pinus yunnanensis seedlings in response to shade and drought interaction

WEN Chengjing1，2，3， WU Junwen1 1，2.3*， JING Huiqing' 1，2，3

CHEN Gang，23，LIZhiqi123，DUANGuihe23

1.ColegeofstoutFrUesitKugi;KbotoriolFestd AdministrationonBiodiversityConseruationinSouthwestChina，SouthuestForestryUniversity，Kunming 65O224，China；3.Key Laboratory for Forest Resources Conservation and Utilizationin the Southwest Mountains，Ministry of Education， Southwest Forestry University，Kunming 650224， China）

Abstract：Inorder to investigatethegrowthof Pinusyunnanensissedlingsand thestoichiometriccharacteristicsof carbon（C），nitrogen（N）and phosphorus（P）of different organs inresponse to shade and drought treatments and the adaptive mechanism，the growth of P ：yunnanensis seedlings in shade and drought environments was measured and analyzed in a potting controlled experiment using 1-year-old P . yunnanensis seedlings as the subject. The experiment was set up with two levels of 0% shade and 70% shade，and four moisture gradients of normal moisture（CK，8 0%±5% ）， light drought （LD，6 5%±5% ），moderate drought（ MD ，50 1%±5% ）and severe drought（SD，3 5%±5% ）were set to determine the growth indexes of P .yunnanensis seedlings under shade and drought treatments，as well as the C，N，and Pcontents of leaf，stem，coarserotand fineroot，andcalculate their stoichiometric characteristics.Theresults were as follows：（1） Seedling height，ground diameter and biomass increment were the greatest under 0% shadeand 70% shade conditions with LD；leaf biomass increment was significantly increased under the shade treatment（ 70% shade） compared with no shade treatment （ 0% shade）in all drought stress treatments.（2）Compared with the normal water treatment，with the increase of drought stress degree，the C content in each organ of P .yunnanensis seedlings under the shadeand drought interaction didnotchange significantly；theNcontent inleaf decreased，theNcontents instemand coarse root increased，and the N content in fine root decreased and then increased;the P content in leaf and coarse root decreased，and the P content in fine root increased.（3）The order of variability of each element was C

KeyWords：Pinusyunnanensis，stoichiometriccharacteristics，droughtstress，hdestress，variability，corlati

光照是植物进行光合作用的必备条件，水分是植物生长代谢过程中最重要的环境因子，当植物所在生长环境的水分条件和光照强度发生变化时，会导致其光合特性及形态结构发生改变（刘建锋等，2011；邓秀秀等，2020）。（剩余23396字）