保水剂-尿素凝胶对侧柏裸根苗细根生长和氮素利用率的影响

doi:10.13287/j.1001-9332.201604.001

应用生态学报 ›› 2016, Vol. 27 ›› Issue (4): 1046-1052.doi: 10.13287/j.1001-9332.201604.001

• 中国生态学学会2015 年学术年会会议专栏 • 上一篇下一篇

保水剂-尿素凝胶对侧柏裸根苗细根生长和氮素利用率的影响

井大炜^1,2,邢尚军^2*,刘方春²,马海林²,杜振宇²,马丙尧²,于学斗¹,朱亚萍¹

¹德州学院, 山东德州 253023;
²山东省林业科学研究院, 济南 250014

收稿日期:2015-05-05 修回日期:2015-10-14 出版日期:2016-04-22 发布日期:2016-04-22
通讯作者: xingsj-126@126.com
作者简介:井大炜,男,1982年生,博士. 主要从事植物营养机理与调控研究. E-mail: jingdawei009@163.com
基金资助:
本文由国家自然科学基金项目(31500513)、山东省科技发展计划项目(2010GSF10621)、德州学院科技人才引进项目(311890)、山东省自然科学基金计划项目(ZR2013GL001)和德州市软科学研究计划项目(2013-43)

Effects of gel made by super absorbent polymers and urea on fine root growth and nitrogen use efficiency of Platycladus orientalis bareroot seedlings.

JING Da-wei^1,2, XING Shang-jun^2*, LIU Fang-chun², MA Hai-lin², DU Zhen-yu², MA Bing-yao², YU Xue-dou¹, ZHU Ya-ping¹

¹Dezhou University, Dezhou 253023, Shandong, China;
²Shandong Forestry Academy, Ji’nan 250014, China

Received:2015-05-05 Revised:2015-10-14 Online:2016-04-22 Published:2016-04-22
Supported by:
This work was supported by the National Natural Science Foundation of China (31500513), the Science and Technology Development Plan of Shandong Province (2010GSF10621), the Science and Technology Talent Introduction Project of Dezhou University (311890), the Natural Science Foundation of Shandong Province (ZR2013GL001) and the Soft Science Research Plan of Dezhou City (2013-43).2015-05-05 Received, 2015-10-14 Accepted.*

摘要/Abstract

摘要： 在盆栽试验条件下,研究不施肥和保水剂(CK)、单施尿素(U)、单施保水剂(S)、保水剂-尿素混施(SUM)和保水剂-尿素凝胶(SUG)处理对侧柏裸根苗细根的形态特征、吸收面积、氮代谢及氮素利用率的影响.结果表明:与U处理相比,SUG处理显著增加细根的生物量、长度、比根长、表面积和体积,并明显扩大细根的总吸收面积和根尖吸收面积;SUG处理比根长分别较CK、U、S和SUM处理显著增加34.7%、37.9%、41.1%和12.4%,细根的硝酸还原酶、谷氨酰胺合成酶、谷氨酸合成酶和谷氨酸脱氢酶活性分别较U处理提高41.2%、76.6%、30.7%和125.8%,而GS/GDH(谷氨酰胺合成酶/谷氨酸脱氢酶)下降.SUG处理显著促进侧柏裸根苗地径、株高的生长以及地上部和地下部干物质积累,且氮素利用率达到40.7%,分别比U和SUM处理显著提高118.8%和44.5%.保水剂-尿素凝胶通过改善侧柏裸根苗细根的形态特征、提高吸收面积及氮代谢关键酶活性而提高氮素利用率,促进生长,并增强抵御干旱胁迫的能力.

Abstract: A pot experiment including five treatments, i.e., CK (neither fertilizer nor super absorbent polymers), U (urea alone), S [super absorbent polymers (SAP) alone], SUM (SAP mixed with urea) and SUG (gel made of SAP and urea) was conducted to evaluate their effects on fine root morphological characteristics, fine root absorption area, fine root nitrogen metabolism and nitrogen use efficiency of Platycladus orientalis bareroot seedlings. Results showed that compared with U treatment, the SUG treatment significantly increased the biomass, length, specific root length, surface area and volume of fine root. The total absorption area and active absorption area of fine root were also increased remarkably under the SUG treatment. The specific root length in the SUG treatment was increased by 34.7%, 37.9%, 41.1% and 12.4% compared with the treatments of CK, U, S and SUM, respectively. Compared with the U treatment, the activities of nitrate reductase, glutamine synthase, glutamate synthase and glutamate dehydrogenase in fine root of the SUG treatment was improved by 41.2%, 76.6%, 30.7% and 125.8%, respectively, while the ratio of GS to GDH decreased. Not only the ground diameter and plant height, but also the dry matter accumulation of aboveground and underground parts was remarkably enhanced under the SUG treatment. The nitrogen use efficiency was 40.7% in the SUG treatment, being 118.8% and 44.5% higher than the U and SUM treatments, respectively. Gel made of SAP and urea was able to significantly increase the nitrogen use efficiency, promote the growth and enhance the ability of drought resistance by improving the morphological characteristics, enhancing the absorption area and key enzymes activities of nitrogen metabolism in the fine root of P. orientalis bareroot seedlings.

井大炜,邢尚军,刘方春,马海林,杜振宇,马丙尧,于学斗,朱亚萍. 保水剂-尿素凝胶对侧柏裸根苗细根生长和氮素利用率的影响[J]. 应用生态学报, 2016, 27(4): 1046-1052.

JING Da-wei, XING Shang-jun, LIU Fang-chun, MA Hai-lin, DU Zhen-yu, MA Bing-yao, YU Xue-dou, ZHU Ya-ping. Effects of gel made by super absorbent polymers and urea on fine root growth and nitrogen use efficiency of Platycladus orientalis bareroot seedlings.[J]. Chinese Journal of Applied Ecology, 2016, 27(4): 1046-1052.

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保水剂-尿素凝胶对侧柏裸根苗细根生长和氮素利用率的影响

Effects of gel made by super absorbent polymers and urea on fine root growth and nitrogen use efficiency of Platycladus orientalis bareroot seedlings.

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