根域限制对柠条基质黄瓜幼苗生长及气体交换参数的影响  

Effect of root-zone volume on the growth and gas exchange parameters of cucumber seedlings in caragana substrates

作　　者：曲继松[1] 张丽娟[1] 冯海萍[1] 杨冬艳[1] 

机构地区：[1]宁夏农林科学院种质资源研究所,宁夏银川750002

出　　处：《江苏农业学报》2015年第1期130-133,共4页Jiangsu Journal of Agricultural Sciences

基　　金：宁夏自然科学基金项目(NZ12241);宁夏科技攻关项目(2012ZYH110);宁夏重大科技专项子项目(2013ZDN04)

摘　　要：为了解柠条基质育苗过程中根域体积大小对黄瓜幼苗生长和光合生理特性的影响,以黄瓜品种德尔99为试材,采用自配育苗基质[柠条粉∶珍珠岩∶蛭石=7∶2∶1（体积比）],按照不同规格穴盘（每盘32-288穴）进行育苗。结果表明：黄瓜幼苗株高随着根域体积减小而逐渐增高,根系长度与根域体积的皮尔逊系数为0.962 7,根系体积与根域体积的皮尔逊系数为0.960 2,地下部干质量、壮苗系数与根域体积的皮尔逊系数分别为0.899 0、0.888 8;每盘32穴处理、每盘50穴处理、每盘72穴处理壮苗系数均大于0.25;黄瓜幼苗的净光合速率、蒸腾速率、胞间CO2浓度随着根域体积的减小而降低,每盘72穴处理的水分利用效率值最高,为2.513 9。综合壮苗指数、根系活力、气体交换参数等多方面因素考虑,建议柠条基质培育黄瓜幼苗时使用每盘72穴的穴盘。To explore the effects of volume size of root domain on growth and photosynthetic physiological characteristics of cucumber seedlings cultured in caragana substrates,the cucumber variety,De Er 99 with different root sizes（ 32 cells to 288 cells per plate） were nurtured in self-made nursery matrix（ caragana powder∶ perlite∶ vermiculite = 7∶ 2∶1 by volume）. The results show that the cucumber seedling height gradually increased as the root domain volume decreased. The Pearson correlation coefficient was 0. 962 7 between root length and root domain volume,was 0. 960 2 between root volume and the volume of the root domain,was 0. 899 0 between root dry mass and root domain volume,and was0. 888 8 between seedling indexes and root domain volume. The seedling indexs of treatments of 32 cells per plate,50 cells per plate and 72 cells per plate were greater than 0. 25. The net photosynthetic rate,transpiration rate and intercellular CO2 concentration of cucumber seedlings reduced with the decrease of root domain volume. The water use efficiency value of 72 cells per plate treatment was the highest,reaching 2. 513 9. The treatment of 72 cells per plate was recommend to be the favorable volume size for cucumber seedling growth.

关 键 词：柠条基质 根域体积 黄瓜幼苗 干物质积累 光合特性 

分 类 号：S316[农业科学—作物栽培与耕作技术] S642.2[农业科学—农艺学]