不同磷水平对南酸枣苗期生长的影响  

Effects of phosphorus levels on seedling growth of Choerospondias axillaris

作　　者：吴敏[1] 陈瑞[1] 童方平[1] 杨文海 童琪 刘森 邓芫礼 李贵[1] WU Min;CHEN Rui;TONG Fangping;YANG Wenhai;TONG Qi;LIU Sen;DENG Yuanli;LI Gui(Hunan Academy of Forestry,Changsha 410004,Hunan,China;Guizhou Botanical Garden,Guiyang 550004,Guizhou,China)

机构地区：[1]湖南省林业科学院,湖南长沙410004 [2]贵州省植物园,贵州贵阳550004

出　　处：《湖南林业科技》2024年第6期36-41,共6页Hunan Forestry Science & Technology

基　　金：湖南省重点研发项目(2022NK2020);湖南省林业科技攻关与创新项目(XLKY202209);湖南省林业局项目“抗旱容器育苗的适应性评价”。

摘　　要：本研究以当年生南酸枣实生苗为供试材料进行盆栽试验,设置0.2、8.0、16.0、32.0 mg·kg^(-1)等4个土壤磷素水平,分析不同供磷水平下南酸枣苗期生长、磷积累量、总磷利用效率及光合参数的变化规律,探索南酸枣幼苗生长的最适宜磷水平。研究结果表明:当磷供应水平为16.0 mg·kg^(-1)时,南酸枣幼苗的地径、根系干物质量、地上部分干物质量及总干物质量分别为12.00 mm、17.63 g、20.79 g、38.42 g,均显著高于其他3个供磷水平;地上部分磷积累量、根系磷积累量及单株总磷积累量在磷供应水平为16.0 mg·kg^(-1)时最大,分别为15.56、19.27、34.03 mg,显著高于0.2、8.0 mg·kg^(-1)这2个供磷水平。在磷供应水平为16.0 mg·kg^(-1)时,净光合速率、气孔导度、蒸腾速率分别为9.48μmol·m^(-2)·s^(-1)、0.10 mol·m^(-2)·s^(-1)、3.11 mmol·m^(-2)·s^(-1),显著高于其他3个供磷水平。随着磷供应水平的提高,总磷利用效率显著降低,4个不同磷供应水平之间差异显著。磷供应水平为16.0 mg·kg^(-1)的处理显著促进了南酸枣幼苗的生长及磷的积累,为南酸枣苗期适宜的磷供应水平。In this study,to explore the optimum phosphorus level for the growth of Choerospondias axillaris seedlings,the growth,phosphorus accumulation,total phosphorus utilization efficiency and photosynthetic parameters of C.axillaris seedlings were analyzed under four soil phosphorus levels of 0.2,8.0,16.0 and 32.0 mg·kg^(-1).The results showed that when the phosphorus supply level was 16.0 mg·kg^(-1),the ground diameter,root dry weight,aboveground dry weight and total dry weight of the seedlings were 12.00 mm,17.63 g,20.79 g and 38.42 g,respectively,which were significantly higher than those of the other three phosphorus supply levels.The phosphorus accumulation of aboveground part,root and total phosphorus accumulation per plant were the highest at the phosphorus supply level of 16.0 mg·kg^(-1),which were 15.56,19.27 and 34.03 mg,respectively,which were significantly higher than those at the two phosphorus supply levels of 0.2 and 8.0 mg·kg^(-1).When the phosphorus supply level was 16.0 mg·kg^(-1),the net photosynthetic rate,stomatal conductance and transpiration rate were 9.48μmol·m^(-2)·s^(-1),0.10 mol·m^(-2)·s^(-1) and 3.11 mmol·m^(-2)·s^(-1) respectively,which were significantly higher than the other three phosphorus supply levels.With the increase of phosphorus supply,the total utilization efficiency of phosphorus decreased significantly,and there were significant differences among the four different phosphorus supply levels.The treatment with phosphorus supply level of 16.0 mg·kg^(-1)significantly promoted the growth and phosphorus accumulation of C.axillaris,which was the appropriate phosphorus supply level for C.axillaris seedlings.

关 键 词：南酸枣 磷水平 生长 光合参数 

分 类 号：Q945.12[生物学—植物学]