贝壳沙埋深度对杠柳幼苗生长及光合特性的影响  

Effects of Shell Sand Burial on Seedling Growth and Photosynthetic Characteristics of Periploca sepium Bunge

作　　者：李田[1] 孙景宽[1] 刘京涛[1] 杨红军[1] 宋爱云[1] LI Tian;SUN Jing-kuan;LIU Jing-tao;YANG Hong-jun;SONG Ai-yun(Key Laboratory of Eco-environmental Science for Yellow River Delta,Binzhou University,Binzhou 256603,China)

机构地区：[1]滨州学院山东省黄河三角洲生态环境重点实验室,山东滨州256603

出　　处：《江西农业大学学报》2020年第2期338-348,共11页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家自然科学基金项目(41971119,41871089);山东省自然科学基金项目(ZR2019MD024);山东省高等学校青创科技支持计划(2019KJD010)。

摘　　要：【目的】研究杠柳幼苗生长及光合特性对贝壳沙埋深度的响应,探讨杠柳幼苗对贝壳沙埋深度的耐受极限,为贝壳堤海岸带植被的恢复重建提供科学依据。【方法】设定不同埋深的贝壳沙埋深度分别为0%、33.3%、66.7%、100%、120%,每隔15 d统计杠柳植株的成活率,60 d后采用光合测定系统对不同埋深处理下的杠柳叶片净光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)进行测定,同时对其株高、根长以及根、茎、叶干质量等生物量进行测定;采用SPSS、Amos Graphics软件对相关参数及其相互作用关系进行分析和处理。【结果】除埋深120%杠柳幼苗死亡外,其他各处理下杠柳幼苗的各项生长指标均随着贝壳沙埋深度的增加呈现先上升后下降的趋势。杠柳幼苗株高、根长、根干质量、茎干质量和叶干质量在埋深33.3%时最高,在埋深100%时最低。杠柳净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)、光能利用效率(LUE)和羧化效率(CE)随着贝壳沙埋深度的增加均有不同程度的提高,其中埋深33.3%时,杠柳Pn、Tr、LUE、CE达到最大值,但与埋深66.7%时差异不显著;埋深66.7%时,杠柳WUE最大,显著高于对照34.0%,但与埋深33.3%差异不显著。结构方程模型分析表明,在一定埋深范围内,杠柳株高、根长、茎干质量的增加主要是由杠柳净光合速率和水分利用效率的增强引起的。【结论】适当的贝壳沙埋深度(33.3%),可引发杠柳启动自我补偿策略,促进杠柳的生长和资源利用效率的提高,但超过一定的埋深阈值,会导致杠柳幼苗的死亡。[Objective]This study aimed to investigate the response of growth and photosynthetic characteristics of Periploca sepium Bunge seedlings to the depth of shell sand burial,and to explore the tolerance limit of Periploca sepium Bunge seedlings to the shell sand burial depth,so as to provide a scientific basis for vegetation restoration and reconstruction in the coastal zone.[Method]The set depths of shell sand burial were 0%,33.3%,66.7%,100% and 120% respectively,and then the survival rates of Periploca sepium under the above treatments were counted every 15 days.After 60 days,the net photosynthetic rate(Pn),transpiration rate(Tr)and intercellular CO2 concentration(Ci)of Periploca sepium leaves under different burial depths were measured by the photosynthetic measurement system,and the plant height,root length,dry weight of root,stem and leaf were also measured.SPSS and Amos Graphics softwares were used to analyze and deal with the relevant parameters and their interaction relationship.[Result]The Periploca sepium seedlings died under the 120% of burial depth,the growth indexes of seedlings treated with the increase of other shell sand buried depths showed the trend of rising first and then declining.The maximum value of the plant height,root length,root dry weight,stem dry weight,root dry weight of Periploca sepium seedlings were observed under 33.3% burial depth,while the minimum value was observed under 100% burial depth.The net photosynthetic rate,transpiration rate,water use efficiency,light use efficiency and carboxylation efficiency of Periploca sepium generally increased with burial depth.The Pn,Tr,LUE and CE were the greatest under 33.3% burial depth,however,no significant difference was observed between the values under the two burial depths of 33.3% and 66.7%.The WUE was the greatest under 66.7% burial depth and significantly greater than that under the CK burial depth(34.0%),however,there was no significant difference in the treatment of 33.3%.Structural equation model analysis suggested that the increa

关 键 词：贝壳沙埋深 杠柳 生长特性 光合特性 结构方程模型分析 

分 类 号：Q945.78[生物学—植物学]