Effects of drought on nitrogen uptake and distribution in Camellia oleifera root under nitrogen addition

doi:10.12302/j.issn.1000-2006.202303015

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (1): 95-102.doi: 10.12302/j.issn.1000-2006.202303015

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Effects of drought on nitrogen uptake and distribution in Camellia oleifera root under nitrogen addition

JIANG Xiaozeng¹(), ZHU Yan², ZHOU Hengwei¹, HUANG Xingzhao¹, FU Longlong³, WAN Fangfang¹^,^*()

1. Anhui Provincial Key Laboratory of Forest Resources and Silviculture, College of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
2. Forestry Research Institute of Chinese Academy of Forestry, Beijing 100091, China
3. Jinzhai County Forestry Bureau, Lu’an 237300, China

Received:2023-03-13 Revised:2023-08-18 Online:2025-01-30 Published:2025-01-21
Contact: WAN Fangfang E-mail:1604054757@qq.com;wanf@ahau.edu.cn

Abstract

Abstract:

【Objective】This study investigates the growth response and nutrient utilization of the Camellia oleifera root system across different root orders under drought and nitrogen application. It aims to analyze how water and nitrogen affect root growth, nitrogen uptake, distribution and utilization, and to provide theoretical support for understanding the relationship between plant root architecture and nutrient strategies under climate warming. 【Method】 Two-year-old C. oleifera ‘Changlin 53’ trees were used. A pot experiment with ¹⁵N isotope tracing technology was conducted, setting two drought levels: normal irrigation (soil moisture content 75% ± 5%) and drought (soil moisture content 30%±5%). Two nitrogen application levels were used: no nitrogen and ¹⁵N-labeled ammonium nitrate (2.88 g/plant). After 75 days of drought treatment, the biomass, total nitrogen content, percentage of nitrogen from fertilizer (Ndff), and nitrogen use efficiency of roots of different diameter classes of C. oleifolia seedlings were measured. 【Result】 Under drought stress, there was a negative correlation between biomass and nitrogen content in grade 1-3, grade 5, and grade 6 roots, while a positive correlation was observed in grade 4 roots. Drought significantly affected ¹⁵N content and Ndff in all root diameter classes (P < 0.05). Drought inhibited ¹⁵N accumulation in all root diameter classes, with Ndff in grades 1-3 being most affected. Drought increased nitrogen distribution in roots, especially in grade 5 roots, which saw a 93.10% increase. However, the nitrogen use efficiency was inhibited to varying degrees across different root diameter classes. 【Conclusion】Nitrogen application increased root biomass and nitrogen allocation to coarse roots under drought but reduced fine root biomass and nitrogen accumulation. Drought significantly impacted the absorption, utilization, and distribution of fertilizer nitrogen in roots of all levels, enhancing nitrogen distribution, particularly in roots above grade 5, but inhibiting ¹⁵N absorption and utilization in roots of grades 1-4.

Key words: Camellia oleifera, nitrogenous addition, drought stress, root order, nitrogen fertilizer utilization

CLC Number:

S718.43

JIANG Xiaozeng, ZHU Yan, ZHOU Hengwei, HUANG Xingzhao, FU Longlong, WAN Fangfang. Effects of drought on nitrogen uptake and distribution in Camellia oleifera root under nitrogen addition[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2025, 49(1): 95-102.

Figures/Tables 8

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Effects of drought on nitrogen uptake and distribution in Camellia oleifera root under nitrogen addition

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