氮磷配施对刨花楠幼苗相对生长速率与细根性状关系的影响

doi:10.13292/j.1000-4890.202308.011

生态学杂志 ›› 2023, Vol. 42 ›› Issue (8): 1811-1819.doi: 10.13292/j.1000-4890.202308.011

氮磷配施对刨花楠幼苗相对生长速率与细根性状关系的影响

程洁茹¹,钟全林^1,2,3*,邹宇星¹,常云妮¹,廖鹏辉⁴

（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; ⁴福建省林业科学技术推广总站，福州 350007）

出版日期:2023-08-10 发布日期:2023-07-27

Effects of different ratios of nitrogen and phosphorus addition on the relationship between relative growth rate and fine root traits of Machilus pauhoi seedlings.

CHENG Jieru¹, ZHONG Quanlin^1,2,3*, ZOU Yuxing¹, CHANG Yunni¹, LIAO Penghui⁴#br#

#br#

(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; ⁴Fujian Forestry Technology Popularization Station, Fuzhou 350007, China).

Online:2023-08-10 Published:2023-07-27

摘要/Abstract

摘要： 氮（N）、磷（P）是影响植物生长的重要营养元素，细根是植物吸收养分与水分的重要器官。本研究以刨花楠（Machilus pauhoi）1年生幼苗为对象，通过不同氮磷配施的盆栽试验，分析不同氮磷配施比例（15∶1、12∶1、10∶1、8∶1）对其生长及细根性状的影响。结果显示：（1）不同比例的氮磷配施均会显著增大刨花楠叶生物量、总生物量和叶质量分数，降低根冠比，以10∶1和8∶1的N/P为明显；（2）氮磷配施使总生物量及各器官生物量相对生长速率显著增大，以N/P为10∶1时最大；（3）氮磷配施使细根N、P含量显著升高，但细根N/P差异不明显，其中细根N含量以15∶1和10∶1处理较高，细根P含量以10∶1处理为最高；氮磷配施使各根级平均直径及1～2级根的比表面积（SRA）减小，使2～4级根的比根长（SRL）及3～4级根的SRA增大，各根级的根组织密度（RTD）则与SRA相反；（4）氮磷配施后幼苗的总生物量及各器官相对生长速率均与RTD呈显著正相关，与SRL及SRA呈显著负相关。研究表明，不同比例氮磷配施会影响刨花楠幼苗生物量分配模式及相对生长速率，并影响生物量相对生长速率与部分细根性状间关系，以10∶1的氮磷配施比例最适宜其生长。研究结果对开展刨花楠苗木精准养分管理与高效培育等具有重要参考价值。

关键词: 氮磷比, 相对生长速率, 生物量分配, 细根性状, 刨花楠

Abstract: Nitrogen (N) and phosphorus (P) are important nutrients affecting plant growth. Fine root is an important organ to absorb nutrients and water. Here, we analyzed the effects of different N and P application ratios (15∶1, 12∶1, 10∶1, 8∶1) on the growth and fine root traits of 1-year-old Machilus pauhoi seedlings in a pot experiment. The results showed that: (1) All the N and P addition treatments significantly increased leaf biomass, total biomass, and leaf mass fraction, but decreased root-shoot ratio, especially at the treatments with N/P ratios of 10∶1 and 8∶1. (2) Combined applications of N and P significantly increased relative growth rates of both total biomass and biomass of each organ, with a strongest effect under N/P ratio of 10∶1. (3) Combined applications of N and P significantly increased N and P concentrations in fine roots (P<0.05), with no difference among treatments. Fine root N concentration was the highest in the treatments with N/P ratios of 15∶1 and 10∶1. Fine root P concentration was the highest in the treatment with N/P ratio of 10∶1. Combined applications of N and P reduced the average diameter of each fine root order and specific surface area (SRA) of the 1st-2nd order roots, but increased specific root length (SRL) of the 2nd-4th order roots and SRA of the 3rd-4th order roots. The changes of root tissue density (RTD) of each order was opposite to that of SRA. (4) The relative growth rates of total biomass and biomass of each organ were significantly positively correlated with RTD but negatively correlated with SRL and SRA after combined N and P application. The results indicated that application of different N/P ratios affected biomass allocation pattern, relative growth rate, and the relationship between relative growth rate and some fine root traits of M. pauhoi seedlings. The most suitable ratio of N/P for the growth of M. pauhoi seedlings was 10∶1. Our results provide an important reference for the development of precise nutrient management and efficient cultivation of M. pauhoi seedlings.

Key words: nitrogen/phosphorus ratio, relative growth rate, biomass allocation, fine root trait, Machilus pauhoi.

程洁茹, 钟全林, 邹宇星, 常云妮, 廖鹏辉. 氮磷配施对刨花楠幼苗相对生长速率与细根性状关系的影响[J]. 生态学杂志, 2023, 42(8): 1811-1819.

CHENG Jieru, ZHONG Quanlin, ZOU Yuxing, CHANG Yunni, LIAO Penghui. Effects of different ratios of nitrogen and phosphorus addition on the relationship between relative growth rate and fine root traits of Machilus pauhoi seedlings.[J]. Chinese Journal of Ecology, 2023, 42(8): 1811-1819.

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氮磷配施对刨花楠幼苗相对生长速率与细根性状关系的影响

Effects of different ratios of nitrogen and phosphorus addition on the relationship between relative growth rate and fine root traits of Machilus pauhoi seedlings.

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