文献类型：期刊文献

中文题名：施氮对白刺灌木幼苗生长的影响

英文题名：Effects of Nitrogen Addition on the Growth Characteristics of Nitraria tangutorum

作者：段娜[1,2] 汪季[1] 李清河[3] 赵纳祺[2] 高君亮[2] 陈晓娜[2]

第一作者：段娜

机构：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010010;[2]国家林业局内蒙古磴口荒漠生态系统定位观测研究站/中国林业科学研究院沙漠林业实验中心,内蒙古磴口015200;[3]中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京100091

年份：2019

卷号：34

期号：5

起止页码：57-61

中文期刊名：西北林学院学报

外文期刊名：Journal of Northwest Forestry University

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：国家自然科学基金(31470622);中央级公益性科研院所基本科研业务费专项资金(CAFYBB2017QA030)

语种：中文

中文关键词：氮添加;白刺;生长特性;生物量分配

外文关键词：nitrogen addition;Nitraria tangutorum;growth characteristics;biomass allocation

分类号：S793.9

摘要：通过4种浓度氮素处理,对唐古特白刺的形态特性及生物量分配等方面进行研究,探讨施氮对唐古特白刺表型可塑性的影响。结果表明:1)一定浓度范围内的氮素有利于白刺生长,施用氮素后白刺的株高、基径、比叶面积、新枝数及生物量等指标均有所增加,但随施氮浓度的增加,部分指标呈现出先增加后降低的趋势。2)当施氮浓度为36mmol·L^-1时,白刺叶片干重和比叶面积增加幅度最显著(P<0.05),分别达1.14g、196.17cm2·g^-1,较不施氮处理增加48.05%和49.93%;当氮添加浓度为60mmol·L^-1时,白刺根总干重已显著低于无氮添加处理(P<0.05),此时根总干重仅为不施氮处理的59.54%。3)白刺根茎叶分配比例虽施氮浓度变化有所调整,其叶片分配比例和茎分配比例增加,根系分配比例和根冠比降低,60mmol·L^-1的氮添加对根系分配比例和根冠比的抑制作用最严重。并非浓度越高的氮素对白刺生长越有利。
In order to study the phenotypic plasticity of Nitraria tangutorum ,under the different nitrogen additions,the morphology characteristics and biomass of N.tangutorum were studied.The results showed that 1) nitrogen concentration in certain range was beneficial to the growth of N.tangutorum seedlings.The plant height,basal diameter,specific leaf area,number of new branches and seedling biomass increased after nitrogen application.With the increase of nitrogen concentration,some indexes showed trended to increase first and then to decrease.2) When the nitrogen concentration was 36 mmol·L^-1 ,the leaf dry weight and specific leaf area increased significantly ( P <0.05),reaching 1.14 g and 196.17 cm 2·g^-1 respectively,accounted for 48.05% and 49.93%,respectively,compared with those of the control (no nitrogen addition).When the nitrogen concentration was 60 mmol·L^-1 ,the total dry weight of root was significantly lower than that of the the control ( P <0.05),and the total dry weight of root was only 59.54% of the control.3) The ratio of the growth among different organs changed with nitrogen addition.The ratios of leaf and stem growth increased with nitrogen addition,while the growth of root and root shoot decreased.The nitrogen addition of 60 mmol·L^-1 had the most serious inhibitory effect on root distribution ratio and root shoot ratio.In short,the growth status of N.tangutorum seedlings was not directly proportional to the nitrogen concentration.