Spatial distribution characteristics of fine roots of <i>Populus euphratica</i> Oliv. under different groundwater depths in arid regions

Chen Xiao-Lin; Chen Ya-Peng; Li Wei-Hong; Wang Yu-Yang

doi:10.11913/PSJ.2095-0837.2018.10045

Plant Science Journal > 2018 > 36(1): 45-53. > DOI: 10.11913/PSJ.2095-0837.2018.10045 CSTR: 32231.14.PSJ.2095-0837.2018.10045

Chen Xiao-Lin, Chen Ya-Peng, Li Wei-Hong, Wang Yu-Yang. Spatial distribution characteristics of fine roots of Populus euphratica Oliv. under different groundwater depths in arid regions[J]. Plant Science Journal, 2018, 36(1): 45-53. DOI: 10.11913/PSJ.2095-0837.2018.10045

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Spatial distribution characteristics of fine roots of Populus euphratica Oliv. under different groundwater depths in arid regions

1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

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This work was supported by grants from the Pioneer Initiative Program of Chinese Academy of Science (TSS-2015-014-FW-2-3) and National Natural Science Foundation of China (41371515).

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Received Date: July 16, 2017
Available Online: October 31, 2022
Published Date: February 27, 2018

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Abstract

Abstract

The spatial distribution of fine roots can well reflect the utilization degree and adaptability of plants to the environment, which is essential for the evaluation of adaptation to adverse circumstances. We investigated the spatial distribution of Populus euphratica Oliv. fine roots (D ≤ 2 mm) and the relationship with groundwater depth and soil water content. Fine roots and soil samples were collected by the artificial trench profile method. Results showed that:(1) In the horizontal direction (range of 550 cm), fine root length density (RLD), fine root surface area density (SAD), and fine root mass density (RMD) of< P. euphratica changed insignificantly with distance from the tree trunk. (2) In the vertical direction, there were almost no fine roots in the top layer of the soil profile. With the increase in soil depth, both RLD and RMD exhibited increasing trends at first, and then showed decreasing trends. We found high fine specific root length (SRL) and specific root area (SRA) of< P. euphratica at the 280 cm soil depth. (3) RLD and RMD showed positive correlations with soil moisture content of the upper soil (0-180 cm), but exhibited spatial heterogeneities with soil moisture at deeper layers. These results revealed that P. euphratica roots were restricted by soil water conditions in the upper soil, and the fine roots in deeper soil were mainly affected by groundwater. The P. euphratica root system not only demonstrated the ability to develop into the deep moist soil, but also showed a strong horizontal expansion capability to cope with drought environments. This study provides a reference for understanding the adaptation mechanism of P. euphratica to extremely arid environments.
- Extremely arid region,
- Populus euphratica,
- Distribution of fine roots,
- Soil water content,
- Groundwater depth

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