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施肥对盆栽香樟幼苗不同根序细根养分的影响(PDF)

《广西植物》[ISSN:1000-3142/CN:45-1134/Q]

期数:
2015年04期
页码:
507-514
栏目:
生态与生物地理
出版日期:
2015-07-20

文章信息/Info

Title:
Effects of fertilization on nutrient concentrations of different root orders’ fine roots in Cinnamomum camphora seedings
作者:
范 川1 黄复兴1 李晓清2* 李贤伟1 舒 翔1 李 平1
1. 四川农业大学 林学院 长江上游林业生态工程四川省重点实验室, 四川 雅安 625014; 2. 四川省林业科学研究院, 成都 610081
Author(s):
FAN Chuan1 HUANG Fu-Xing1 LI Xiao-Qing2* LI Xian-Wei1 SHU Xiang1 LI Ping1
1. College of Forestry, Sichuan Agricultural University, The Key Laboratory of Forestry Ecological Engineering of Sichuan Province, Ya’an 625014, China; 2. Sichuan Academy of Forestry, Chengdu 610081, China )
关键词:
香樟 施肥 细根 根序
Keywords:
Cinnamomum camphora fertilization fine root root orders
分类号:
Q945.12; S792.23
DOI:
-
文献标识码:
A
摘要:
以盆栽的1年生香樟实生苗为研究对象,采用指数施肥的方式,测定1~5级细根的C、N、P、K含量,并探讨施肥对香樟幼苗细根养分浓度的影响。结果表明:(1)不同根序细根的全C浓度差异不显著,施肥对细根全C浓度影响不显著(P>0.05);(2)在所有根序中,N、P浓度最高的是1级根,但其K浓度却最低; N、P含量最低的是5级根;(3)细根的N、P含量随着根序的增加呈显著的下降趋势(P<0.05);(4)施N肥能显著增加1~2级细根的N含量,施P肥能显著增加1级根的P含量,N+P肥较之P肥更能提高1级根对P的吸收;(5)C:N:P受根序的影响非常明显,1级根平均为366:16:1,5级根则为807:12:1,而且C:N:P随着根序增加而显著升高,但N:P无显著影响;(6)虽然施肥对细根C含量无影响,但施N肥或N+P肥对1~2级细根中N的含量有显著性增加。综合分析可知,处理9对香樟苗期养分浓度指标影响最为显著,即施肥量为氮素4 g·株-1、磷素4 g·株-1、钾素2 g·株-1时,对香樟幼苗细根的生长发育有较好地促进作用。研究结果可为香樟的速生丰产及资源的高效利用提供理论依据。
Abstract:
Setting one-yearold potted Cinnmomum camphora seedlings as the research object, using exponential fertilization method, we detected the first to the fifth order fine roots C, N and P contents, in order to explore the effects of fertilization on C. camphora seedlings, and to provide a theoretical basis for C. camphor fast growing and efficient use of resources in nurturing process. The results were as follows:(1)C concentrations of the differences orders’ fine root were not significant, with the rise of the root order, while C content overall upward trend. Fertilization had no significant effect on the C concentration of fine root(P>0.05);(2)N and P concentrations of first order roots were the maximum, while fifth order roots were the minimum, with the rise of root orders. N and P concentrations significantly decreased(P<0.05);(3)N significantly increased the N content level of the first to the second fine roots, P fertilizer significantly increased the P content of a root, mix of nitrogen and phosphorus fertilizer could improve the root uptake of P;(4)C:N:P had a significant difference in different root orders roots;(5)The first order roots’ mean C:N:P was 366:16:1, the fifth order root 807:12:1, with increased root order, C ratio of three kinds of elements increased significantly, while the N:P changed little;(6)Fertilization did not change the proportion of C; however, N fertilizer or mix of nitrogen and phosphorus fertilizer significantly increased the N proportion of the first to second order roots. In conclusion: The treatment 9 pairs of C. camphor on seedling stage indicators impact most significantly. A fertilizer with the nitrogen 4 g·plant-1, the phosphorus 4 g·plant-1 and the potassium 2 g·plant-1, would have significant promote growing for growing and development of fine roots in C. camphor seedlings.

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备注/Memo

备注/Memo:
收稿日期: 2014-06-09修回日期: 2014-12-10
基金项目: 国家林业公益性行业科研专项(201104109); 国家“十二五”科技支撑计划项目(2011BAC09B05)。
作者简介: 范川(1973-),男,四川渠县人,博士,副教授,主要从事人工造林理论及技术研究,(E-mail)fanchuan01@163.com。*通讯作者: 李晓清,博士,研究员,主要从事森林培育研究,(E-mail)464394961@qq.com。
更新日期/Last Update: 2015-07-20