胡杨茎叶化学计量和异速生长关系特征随发育阶段变化的性别差异  

Sex Dimorphism in Allometric Growth Relationships of Stoichiometric Characteristics on Populus euphratica with Different Developmental Stages

作　　者：翟军团 李秀 韩晓莉 张山河 陈家力 李志军[1] ZHAI Juntuan;LI Xiu;HAN Xiaoli;ZHANG Shanhe;CHEN Jiali;LI Zhijun(College of Life Science and Technology,Tarim University,Alar,Xinjiang 843300,China)

机构地区：[1]塔里木大学生命科学与技术学院,新疆阿拉尔843300

出　　处：《西北植物学报》2022年第9期1570-1582,共13页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金(U1803231,31860198);新疆生产建设兵团重点领域创新团队建设计划(2018CB003);中央引导地方科技发展资金资助项目。

摘　　要：胡杨(Populus euphratica Oliv.)是荒漠河岸林防风固沙和水土保持的雌雄异株树种。该研究以不同径阶(8、12、16、20 cm)的胡杨雌雄株为研究对象,通过当年生茎、叶化学计量元素(C、N、P、K)含量及生长关系分析,探讨不同器官化学计量随发育阶段的变化及异速生长关系的性别差异。结果表明:(1)胡杨雌雄株叶片C含量表现为大径阶(20 cm)显著高于小径阶(8 cm),而其叶片N含量随着径阶的增加显著增加;雌雄株茎、叶化学计量随着径阶的增加总体上呈增加趋势,且C、N含量均与径阶呈显著正相关关系;随着径阶的增加,雌株叶片P含量呈下降趋势,与径阶呈显著负相关关系,而雌雄株茎的P、K含量呈上升趋势,且与径阶呈显著正相关关系。(2)雌株各径阶叶片的N含量及8、12、20 cm径阶的叶片P含量均显著大于相应雄株,8、16、20 cm径阶当年生茎C含量以及20 cm径阶茎N、P含量均显著高于相应雄株。(3)雌株叶片C与N在20 cm径阶的斜率指数最大,而雄株在12 cm径阶斜率指数最大,雌雄株在各发育阶段N与P的变化较稳定;在相同C含量时,雄株茎能获得更多的N含量,雌株茎在相同N的情况下能获得更多P元素。研究发现,胡杨雌雄株间茎、叶化学计量元素含量和异速生长关系特征在不同发育阶段存在着明显性别差异,成熟雌株叶片需要更多的化学计量特征含量来满足生殖需求,总体反映了自身生长及环境适应的养分分配策略。Populus euphratica Oliv.is a dioecious tree species for windbreak,sand fixation and soil and water conservation in desert riparian forest.In this study,male and female Populus euphratica plants with different diameter classes(8,12,16,20 cm)were used as the research objects.Through analysis the contents and growth relationship of stoichiometric elements(C,N,P,K)in stems and leaves of the current year,the stoichiometric changes of different classes with developmental stages and the sex differences in allometric growth relationships were discussed.The results showed that:(1)the C content in the leaves of male and female plants of P.euphratica showed that the large-diameter class(20 cm)was significantly higher than that of the small diameter class(8 cm),and the N content of leaves increased significantly with the increase of diameter class;Stem and leaf stoichiometry of male and female plants generally in-creased with the increase of diameter class,and C and N contents were significantly positively correlated with diameter class;With the increase of diameter class,the P content in leaves of female plants showed a downward trend,which was significantly negatively correlated with diameter class,while the P and K con-tents in stems of male and female plants showed an upward trend,and there was a significant positive cor-relation with diameter class.(2)The N content of the leaves of each diameter class and the P content of the 8,12,and 20 cm diameter classes of the female plants were significantly higher than those of the male plants,and the C content of the current year stems of the 8,16 and 20 diameter classes and the N and P contents of the stems of the 20 cm diameter classes were significantly higher than that of the corresponding male plants.(3)The slope indexes of C and N in the leaves of female plants are the largest in the 20 cm di-ameters class,while the slope indexes of male plants are the largest in the 12 cm diameters class.The changes of N and P in male and female plants are relatively stable in each develop

关 键 词：胡杨 性别差异 发育阶段 化学计量特征 异速生长 

分 类 号：Q945.4[生物学—植物学] S792.11[农业科学—林木遗传育种]