短期氮-水处理对刨花楠幼苗细根根序形态的影响

doi:10.13287/j.1001-9332.201807.014

应用生态学报 ›› 2018, Vol. 29 ›› Issue (7): 2323-2329.doi: 10.13287/j.1001-9332.201807.014

短期氮-水处理对刨花楠幼苗细根根序形态的影响

邹宇星¹, 钟全林^1,2,3*, 游雅玲¹, 余华¹, 郑文婷¹, 陈嘉静¹, 程栋梁^1,2,3

¹福建师范大学地理科学学院, 福州 350007;
²湿润亚热带山地生态国家重点实验室培育基地, 福州 350007;
³福建师范大学地理研究所, 福州 350007

收稿日期:2017-11-27 出版日期:2018-07-18 发布日期:2018-07-18
通讯作者: *E-mail: qlzhong@126.com
作者简介:邹宇星, 男, 1994年生, 硕士研究生. 主要从事植物生理生态学研究. E-mail: looe_x@126.com
基金资助:
本文由国家自然科学基金项目(31170596,31170374,31370589)、国家重点研发计划项目(2017YFC0505400)、福建省种业创新和产业化工程项目(2014S1477-4)和福建省科技厅重大项目(2014N5008)资助.

Short-term effects of nitrogen and water treatments on fine root order morphology of Machilus pauhoi seedlings.

ZOU Yu-xing¹, ZHONG Quan-lin^1,2,3*, YOU Ya-ling¹, YU Hua¹, ZHENG Wen-ting¹, CHEN Jia-jing¹, CHENG Dong-liang^1,2,3

¹College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;
²Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007, China;
³Institute of Geography, Fujian Normal University, Fuzhou 350007, China

Received:2017-11-27 Online:2018-07-18 Published:2018-07-18
Contact: *E-mail: qlzhong@126.com
Supported by:
This work was supported by the National Natural Science Foundation of China (31170596, 31170374, 31370589), the National Key Research and Development Plan (2017YFC0505400), the Seed Industry Innovation Project of Fujian Province (2014S1477-4), and the Major Science and Technology Project of Fujian Province (2014N5008).

摘要/Abstract

摘要： 以种子来源于江西遂川的1年生刨花楠扦插苗为材料,设置田间持水量的80%、40% 2个水分水平,以及不添加(0 kg N·hm^-2)、低氮(50 kg N·hm^-2)、高氮(100 kg N·hm^-2) 3个氮添加水平共6种处理的氮-水交互受控试验,测定不同处理刨花楠幼苗3个根序细根比根长、比表面积、平均直径和根组织密度,分析短期氮添加、干旱胁迫及两者交互作用对刨花楠幼苗细根的影响.结果表明: 刨花楠幼苗细根平均直径、比根长在不同根序间差异显著.随根序的增加,刨花楠幼苗细根平均直径增加,其中3级根最大,为0.97 mm;而比根长降低,3级根最小,为238.99 cm·g^-1.氮添加对刨花楠细根的比表面积、平均直径、比根长和根组织密度无显著影响,而水分对刨花楠细根平均直径、比根长、根组织密度影响显著.干旱胁迫明显促进幼苗3级细根直径的增加,降低了1、2级细根根组织密度.干旱环境下幼苗3级根的比根长明显低于正常供水环境下幼苗.氮水交互作用对刨花楠细根形态影响不显著.

Abstract: A factorial nitrogen and water addition experiment was carried out with one year-old Machilus pauhoi seedlings from Suichuan County, Jiangxi Province, with six treatments being established: two water levels with 80% and 40% of field moisture holding capacity and three nitrogen addition levels of 0, 50, 100 kg N·hm^-2. Specific root length, specific root area, average diameter and tissue density of three fine root orders of M. pauhoi were measured to understand the main and interactive effects of short-term nitrogen addition and drought stress on root characters of M. pauhoi seedlings. The results showed that average fine root diameter and specific root length differed significantly among fine root orders. With the increases of root orders, the average root diameter increased, with the maximum being present in the third order (0.97 mm), but specific root length decreased, with the minimum being present in the third order (238.99 cm·g^-1). No significant effects of nitrogen addition on specific root surface area, average fine root diameter, specific root length and root tissue density were observed. There were significant effects of water treatments on average fine root diameter, specific root length and root tissue density. Drought stress significantly increased average diameter of the third order fine roots of seedlings and decreased root tissue density of the first and second order fine roots. Specific root length of the third order fine roots in arid environments was significantly lower than that under the normal water supply condition. There was no interactive effects of nitrogen addition and drought stress on fine root morphology of M. pauhoi.

邹宇星, 钟全林, 游雅玲, 余华, 郑文婷, 陈嘉静, 程栋梁. 短期氮-水处理对刨花楠幼苗细根根序形态的影响[J]. 应用生态学报, 2018, 29(7): 2323-2329.

ZOU Yu-xing, ZHONG Quan-lin, YOU Ya-ling, YU Hua, ZHENG Wen-ting, CHEN Jia-jing, CHENG Dong-liang. Short-term effects of nitrogen and water treatments on fine root order morphology of Machilus pauhoi seedlings.[J]. Chinese Journal of Applied Ecology, 2018, 29(7): 2323-2329.

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短期氮-水处理对刨花楠幼苗细根根序形态的影响

Short-term effects of nitrogen and water treatments on fine root order morphology of Machilus pauhoi seedlings.

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