文献类型：期刊文献

中文题名：施氮方式对牛樟苗期生长及根系发育的影响

英文题名：Effects of nitrogen application methods on the growth and root developmentof Cinnamomum kanehirae seedlings

作者：王先棒[1] 周再知[1] 韩强[1] 潘栋康[1] 王丹薇[1] 黄桂华[1]

第一作者：王先棒

机构：[1]中国林业科学研究院热带林业研究所,广东广州510520

年份：2023

卷号：29

期号：12

起止页码：2381-2388

中文期刊名：植物营养与肥料学报

外文期刊名：Journal of Plant Nutrition and Fertilizers

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：广东省林业科技创新专项(2021KJCX018-03)。

语种：中文

中文关键词：牛樟;指数施肥;总施氮量;氮肥分配量;幼苗生长指标;幼苗氮含量

外文关键词：Cinnamomum kanehirae;exponential fertilization;total N rate;individual N rate;seedling growth index;seedling nitrogen content

分类号：S51

摘要：【目的】苗木质量是影响造林成活率的关键因素。研究施肥方式及施氮量对牛樟(Cinnamomum kanehirae)幼苗生长及根系发育的影响,为培育优质牛樟苗木提供技术参考。【方法】盆栽试验在温室内进行,供试材料为1年生牛樟组培苗。设置两个常规施氮处理:集中施氮200 mg/株、常规平均施氮200 mg/株;4个指数施肥处理:200、400、600和800 mg/株;以不施氮肥为对照。每次施肥间隔10天,试验共施肥10次。试验结束后,测定牛樟苗高、地径,根、茎和叶生物量,根系长度、体积和表面积,叶、茎和根的氮含量,分析不同施氮方式下牛樟苗木生长状况、根系生长参数和养分吸收利用的差异。【结果】施肥显著提升了幼苗的生长发育状况,在相同施氮水平下,与常规施肥相比,指数施肥可提高幼苗株高、地径和茎、叶生物量,增加根系长度、体积、表面积、比根长和比根表面积,提升植株氮积累量和叶、茎、根部含氮量。指数施肥方式下,随施氮量的提升,各指标都表现出先增加后降低的趋势,以施氮量为400 mg/株时最优。【结论】施氮对牛樟幼苗生长具有显著影响,指数施氮方式优于常规施氮方式。指数施肥方式推荐是氮总量为400 mg/株,按照3.54、5.30、7.95、11.9、17.9、26.8、40.2、60.3、90.4、136.0 mg分为10次施用,可获得生物学性状较好、氮素积累量较高的优质牛樟苗木。
【Objectives】The quality of seedlings decides the rate of survivals during afforestation to some extent.We studied the suitable fertilization method and nitrogen fertilizer amount for the cultivation of health Cinnamomum kanehirae seedlings.【Methods】A pot experiment was carried out inside green house,taking 1-year old tissue culture seedlings of Cinnamomum kanehirae as test materials.The fertilizer treatments included two conventional fertilization methods at N rate of 200 mg/plant,i.e.divided the fertilizer evenly into 2 and 10 parts for application(denoted as CF1 and CF2);and 4 exponential fertilization methods with N rate of 200,400,600,and 800 mg/seedling(denoted as EF200,EF400,EF600 and EF800),the N fertilizer were divided into 10 parts using classic Timmer formula;and a no fertilizer control(CK).The growth and development indexes,as well as the nutrient absorption of seedlings(aboveground part)and roots were measured after the fertilization experiment was completed.【Results】Fertilization significantly improved the growth and development of seedlings.Compared with CF1 and CF2,EF200 treatment increased seedling height,ground diameter,biomass(stem and leaf),root system(length,volume,surface area,specific root length and specific root surface area),and N content of leaf,stem and root significantly.Under exponential fertilization,the biomass,and N content of leaves,stems and roots showed a trend of increase first and then decrease with the increase of N application rate,and EF400 was recorded the maximum and significantly higher values than the other treatments.【Conclusions】Nitrogen application has significant effect on the growth of Cinnamomum kanehirae seedlings,using exponential method to allocate nitrogen fertilizer with the growth of Cinnamomum kanehirae seedlings could achieve higher promotion effect than the conventional method.Comprehensively considering seedling growth and nutrient accumulation,N 400 mg/seedling is recommended for the cultivating of Cinnamomum kanehirae seedlings.