氮形态对毛竹幼苗的生长起着重要作用。
Nitrogen form plays an important role in the growth of moso bamboo () seedlings.
作者信息
Zou Na, Huang Ling, Chen Huijing, Huang Xiaofeng, Song Qingni, Yang Qingpei, Wang Tianchi
机构信息
College of Landscape and Art, Jiangxi Agricultural University, Nanchang, Jiangxi, China.
Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University, Nanchang, Jiangxi, China.
出版信息
PeerJ. 2020 Sep 16;8:e9938. doi: 10.7717/peerj.9938. eCollection 2020.
BACKGROUND
This study aimed to gain an understanding of the growth response of (moso bamboo) seedlings to nitrogen (N) and potassium (K) to benefit nutrient management practices and the design of proper fertilizer in nursery cultivation.
METHODS
An orthogonal array L(4×2) was used to study the effects of N forms (NH , NO ), N concentrations (8, 32 mmol/L), and Kconcentrations (0, 0.5, 1.5, 3 mmol/L) on seedling height, leaf number, chlorophyll content (SPAD value), biomass, root systems, and N content of seedlings. Plants were grown in vermiculite under controlled greenhouse conditions.
RESULTS
Our study showed that N form played a significant role in the overall performance of seedlings, followed by the effect of N and K concentrations. Among the N forms, NH significantly improved the growth of seedlings compared with NO . Seedling height, leaf number, chlorophyll SPAD value, biomass, and root system architecture (root length, root surface area, root volume, and root tips) were greater with 8 mmol/L of NH treatments than with 32 mmol/L of NH treatments, whereas root diameter and N content of seedlings were higher with 32 mmol/L of NH than with 8 mmol/L of NH . K displayed inconsistent effects on the growth of seedlings. Specifically, seedling height, leaf number, biomass and root volume increased when the K concentration was increased from 0 to 0.5 mmol/L, followed by a decrease when the K concentration was further increased from 0.5 to 3 mmol/L. Root average diameter of the seedlings was the highest with a K concentration of 1.5 mmol/L, and K had some inhibitory effects on the chlorophyll SPAD value of the seedlings. seedlings performed well with 8 mmol/L NH and further tolerated a higher concentration of both NH and NO , although excessive N could inhibit seedling growth. A lower concertation of K (≤ 0.5 mmol/L) promoted seedling growth and increasing K concentration in the nutrient solution did not alleviate the inhibitory effect of high N on the growth of seedlings. Therefore, NH nitrogen as the main form of N fertilizer, together with a low concertation of K, should be supplied in the cultivation and nutrient management practices of moso bamboo.
背景
本研究旨在了解毛竹幼苗对氮（N）和钾（K）的生长响应，以利于营养管理实践和苗圃栽培中合适肥料的设计。
方法
采用正交试验设计L(4×2)，研究氮形态（NH₄⁺、NO₃⁻）、氮浓度（8、32 mmol/L）和钾浓度（0、0.5、1.5、3 mmol/L）对毛竹幼苗株高、叶片数、叶绿素含量（SPAD值）、生物量、根系以及氮含量的影响。植株在可控温室条件下的蛭石中生长。
结果
我们的研究表明，氮形态对毛竹幼苗的整体生长表现起显著作用，其次是氮和钾浓度的影响。在氮形态中，与NO₃⁻相比，NH₄⁺显著促进了毛竹幼苗的生长。8 mmol/L NH₄⁺处理的幼苗株高、叶片数、叶绿素SPAD值、生物量和根系结构（根长、根表面积、根体积和根尖）均大于32 mmol/L NH₄⁺处理，而32 mmol/L NH₄⁺处理的毛竹幼苗根直径和氮含量高于8 mmol/L NH₄⁺处理。钾对毛竹幼苗生长的影响不一致。具体而言，当钾浓度从0增加到0.5 mmol/L时，幼苗株高、叶片数、生物量和根体积增加，而当钾浓度从0.5进一步增加到3 mmol/L时则下降。幼苗根平均直径在钾浓度为1.5 mmol/L时最高，且钾对幼苗叶绿素SPAD值有一定抑制作用。毛竹幼苗在8 mmol/L NH₄⁺处理下生长良好，并且能耐受较高浓度的NH₄⁺和NO₃⁻，尽管过量的氮会抑制幼苗生长。较低浓度的钾（≤ 0.5 mmol/L）促进幼苗生长，而增加营养液中的钾浓度并不能缓解高氮对毛竹幼苗生长的抑制作用。因此，在毛竹的栽培和营养管理实践中，应以铵态氮作为主要氮肥形态，并配合低浓度的钾进行供应。
Zotero 插件