Adventitious root architecture and growth characteristics of Nitraria tangutorum shrub

doi:10.7522/j.issn.1000-694X.2022.00021

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 172-180.DOI: 10.7522/j.issn.1000-694X.2022.00021

Adventitious root architecture and growth characteristics of Nitraria tangutorum shrub

Xiaole Li¹(), Xiaohong Dang¹^,²(), Bo Zhai¹, Yajuan Wei¹, Xu Chi¹, Huimin Wu¹

^1.College of Desert Control Science and Engineering，Inner Mongolia Agricultural University，Hohhot 010018，China
^2.Hangjin National Positioning Observation and Research Station of Desert Ecosystem，Ordos 017400，Inner Mongolia，China

Received:2021-10-21 Revised:2022-02-20 Online:2022-07-20 Published:2022-08-29
Contact: Xiaohong Dang

Abstract

Abstract:

Root architecture and biomass allocation patterns can effectively reflect the adaptive strategies of plants to arid and infertile environments. Abstract： In this study， Nitraria tangutorum shrub in the West Ordos National Nature Reserve was used as the research object， and the characteristics of the root architecture and biomass allocation pattern of the shrub were investigated by using the traditional excavation method. The results showed as follows ：（1） the main adventitious roots in Nitraria tangutorum shrub at different growth stages were vertical deep-root type. （2） The root topological index TI and the modified topological parameters q_a and q_b were 0.98， 0.95 and 0.52， respectively. The developmental stages were 0.87， 0.69， 0.46. The mature stage is 0.85， 0.63， 0.63. The branching rate of shrub in embryonic stage decreased by 8.96% and 30.05% compared with that in developing and mature stage， respectively. With the development of Nitraria tangutorum shrub， the root diameter of different levels increased gradually， the shrub branches became more complex， and the utilization range of resources expanded gradually. However， compared with the adventitious roots， the biomass distribution center was always inclined to the aboveground part of the shrub. （3） Compared with the embryonic stage and development stage， the ratio of coarse root （tertiary root） and fine root （secondary root and primary root） of the adventitious roots in the mature stage decreased by 32.75% and 0.83%， respectively. In the process of growth， Nitraria tangutorum shrub adapted to the stress environment by increasing the branching rate of its adventitious roots and the biomass of its aboveground and fine roots.

Key words: Nitraria tangutorum, adventitious roots, root architecture, biomass allocation, allometric relationships

CLC Number:

Q948.1

Xiaole Li, Xiaohong Dang, Bo Zhai, Yajuan Wei, Xu Chi, Huimin Wu. Adventitious root architecture and growth characteristics of Nitraria tangutorum shrub[J]. Journal of Desert Research, 2022, 42(4): 172-180.

Figures/Tables 8

References 38

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生长阶段	灌丛形态特征参数				沙堆形态特征参数
生长阶段	短轴/m	长轴/m	高度/m	冠幅/m	短轴/m	长轴/m	高度/m	底面积/m²	体积/m³
雏形阶段	2.36±0.05	3.00±0.10	0.92±0.07	2.68±0.11	2.40±0.18	2.99±2.45	0.48±0.02	5.65±0.88	1.80±0.33
发育阶段	3.45±0.29	3.79±0.46	1.05±0.05	3.62±0.36	3.56±0.20	4.01±0.15	0.63±0.06	11.24±1.05	4.72±0.89
成熟阶段	4.24±0.14	5.13±0.37	1.43±0.11	4.69±0.25	5.13±0.09	6.01±0.15	0.88±0.04	24.25±1.00	14.24±1.15

生长阶段	灌丛形态特征参数				沙堆形态特征参数
生长阶段	短轴/m	长轴/m	高度/m	冠幅/m	短轴/m	长轴/m	高度/m	底面积/m²	体积/m³
雏形阶段	2.36±0.05	3.00±0.10	0.92±0.07	2.68±0.11	2.40±0.18	2.99±2.45	0.48±0.02	5.65±0.88	1.80±0.33
发育阶段	3.45±0.29	3.79±0.46	1.05±0.05	3.62±0.36	3.56±0.20	4.01±0.15	0.63±0.06	11.24±1.05	4.72±0.89
成熟阶段	4.24±0.14	5.13±0.37	1.43±0.11	4.69±0.25	5.13±0.09	6.01±0.15	0.88±0.04	24.25±1.00	14.24±1.15

生长阶段	比例/%			沙埋深度 /cm
生长阶段	水平根	倾斜根	垂直根	沙埋深度 /cm
雏形阶段	17.78	33.34	48.88	8.80±0.66
发育阶段	12.50	37.50	50.00	9.80±0.67
成熟阶段	4.17	37.5	58.33	8.29±0.90

生长阶段	比例/%			沙埋深度 /cm
生长阶段	水平根	倾斜根	垂直根	沙埋深度 /cm
雏形阶段	17.78	33.34	48.88	8.80±0.66
发育阶段	12.50	37.50	50.00	9.80±0.67
成熟阶段	4.17	37.5	58.33	8.29±0.90

生长阶段	相关生长指数		生长关系
生长阶段	均值±标准差	95%置信区间	生长关系
雏形阶段	0.10±0.01^a	0.0665—0.1394	异速生长
发育阶段	0.05±0.02^b	0.0068—0.0929	异速生长
成熟阶段	-0.09±0.03^c	-0.1600—-0.0232	异速生长

Adventitious root architecture and growth characteristics of Nitraria tangutorum shrub

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