大田环境白及苗期生长和光合特性  

Growth and Photosynthetic Characteristics of Bletilla striata at Seedling Stage in Field Environment

作　　者：李诗阳 陈阳峰[1] 聂小英 李自强[1] 吴念庆 肖深根[1] LI Shiyang;CHEN Yangfeng;NIE Xiaoying;LI Ziqiang;WU Nianqing;XIAO Shengen(College of Horticulture,Hunan Agricultural University,Changsha,Hunan 410128;Huaihua Jiutianjie Ecological Agriculture Technology Co.Ltd.,Huaihua,Hunan 418000)

机构地区：[1]湖南农业大学园艺学院,湖南长沙410128 [2]怀化市九天界生态农业科技有限公司,湖南怀化418000

出　　处：《北方园艺》2021年第3期122-127,共6页Northern Horticulture

基　　金：中央引导地方科技发展专项资金科技创新资助项目(2019XF5023,2019XF5063);湖南省中药材产业技术体系资助项目(湘财农指[2019]97号)。

摘　　要：以紫花三叉白及幼苗为试材,采用大田示范试验,基于前期育苗地幼苗长势评级分区情况,测定白及幼苗不同时期生长特性和倒苗期光合特性,通过主成分分析探究表征白及幼苗生长势的综合指标,以期为大田中培育白及壮苗提供参考依据。结果表明:大田环境下白及幼苗生长期株高、叶面积、地上部生物量、块茎生物量、新根生物量和地下部生物量在倒苗期较初苗期均有增长。倒苗期株高、叶面积、叶绿素含量、地上部生物量、老根生物量、新根生物量、块茎生物量、地下部生物量、暗呼吸速率(Rday)、最大净光合速率(Pnmax)、表观量子效率(AQY)均以小区B或A3(均为Ⅰ级苗)最大、小区D2或A1(均为Ⅲ级苗)最小,主成分分析得到表征生长的指标贡献率较高的为新根生物量、表观量子效率(AQY)、地下部生物量。Taking seedlings of Betilla striata(Thunb.)seedlings as test material,using field demonstration test methods,based on the evaluation on the growth of the seedling stage in seedlings of Betilla striata in different sampling plots.The growth characteristics in seedlings of Betilla striata seedlings in different stages and photosynthetic characteristics in seedlings of Betilla striata in sprout tumble stage were measured,and the principal component analysis was used to select the comprehensive indicators to express the growth state in seedlings of Betilla striata.This study can provide reference for the cultivation of seedlings of Betilla striata in the field.The results showed that in the field environment,for the seedlings of Betilla striata in the growing season,the plant height,leaf area,aboveground biomass,tuber biomass,new root biomass and underground biomass all increased during the sprout tumble stage compared with the initial seedling stage.During the sprout tumble stage,the maximum plant height,leaf area,chlorophyll SPAD value,biomass of aboveground,biomass of old roots,biomass of new roots,biomass of tuber,biomass of underground,respiration rates(Rday),net transpiration rates(Pnmax),and the apparent quantum efficiency(AQY)were all in plot B or A3(both levelⅠseedlings),while the minimum were all in plot D2 or A1(both levelⅢseedlings).The principle component analysis showed that the indicators with a higher contribution rate of growth characteristics indicators in the seedlings of Betilla striata include the biomass of new roots,the apparent quantum efficiency(AQY),and biomass of underground.

关 键 词：白及苗期 大田环境 生长特性 光合特性 主成分分析 

分 类 号：S567.23[农业科学—中草药栽培]