云南松幼苗生長(zhǎng)及化學(xué)計(jì)量對(duì)遮陰和干旱互作的響應(yīng)
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DOI：10.11931/guihaia.gxzw202405052
中圖分類號(hào)：Q945.12 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：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
光照是植物進(jìn)行光合作用的必備條件，水分是植物生長(zhǎng)代謝過程中最重要的環(huán)境因子，當(dāng)植物所在生長(zhǎng)環(huán)境的水分條件和光照強(qiáng)度發(fā)生變化時(shí)，會(huì)導(dǎo)致其光合特性及形態(tài)結(jié)構(gòu)發(fā)生改變（劉建鋒等，2011；鄧秀秀等，2020）。（剩余23396字）