Responses of <i>Amygdalus pedunculata</i> Pall. in the sandy and loamy soils to water stress

doi:10.1007/s40333-020-0016-7

Journal of Arid Land

2020, Vol. 12

Issue (5): 791-805 DOI: 10.1007/s40333-020-0016-7

Research article

Responses of Amygdalus pedunculata Pall. in the sandy and loamy soils to water stress

PEI Yanwu^1,², HUANG Laiming^1,^2,^3,^*(

), SHAO Ming'an^1,^2,³, ZHANG Yinglong⁴

¹Key Laboratory of Ecosystems Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
²College of Natural Resources and Environment, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China
³College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
⁴Shenmu Ecological Association, Shenmu 719399, China

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Abstract

Amygdalus pedunculata Pall. is a major species that is widely planted in afforested soils with different textures in the transitional zone between Mu Us Desert and Loess Plateau, China. However, the responses of A. pedunculata to increasing intensity of water stress in different textural soils are not clear. Here, we conducted a soil column experiment to evaluate the effects of different textures (sandy and loamy) on water consumption, water use efficiency (WUE), biomass accumulation and ecological adaptability of A. pedunculata under increasing water stress, i.e., 90% (±5%) FC (field capacity), 75% (±5%) FC, 60% (±5%) FC, 45% (±5%) FC and 30% (±5%) FC in 2018. A. pedunculata grown in the sandy soil with the lowest (30% FC) and highest (90% FC) water contents had respectively 21.3%-37.0% and 4.4%-20.4% less transpiration than those with other water treatments (45%-75% FC). In contrast, A. pedunculata transpiration in the loamy soil decreased with decreasing water content. The magnitude of decrease in transpiration increased with increasing level of water deficit (45% and 30% FC). Mean daily and cumulative transpirations of the plant were significantly lower in the sandy soil than in the loamy soil under good water condition (90% FC), but the reverse was noted under water deficit treatments (45% and 30% FC). Plant height, stem diameter and total biomass initially increased with decreasing water content from 90% to 75% FC and then declined under severe water deficit conditions (45% and 30% FC) in the sandy soil. However, these plant parameters decreased with decreasing water content in the loamy soil. WUE in the sandy soil was 7.8%-12.3% higher than that in the loamy soil, which initially increased with decreasing water content from 90% to 75% FC and then declined under water deficit conditions (45% and 30% FC). The study showed that plant transpiration, biomass production and WUE responded differentially to increasing intensity of water stress in the sandy and loamy soils. The contrasting responses of A. pedunculata to water stress in different textural soils can guide future revegetation programs in the northern region of Chinese Loess Plateau by considering plant adaptability to varying soil and water conditions.

Key words： soil texture water consumption biomass production water use efficiency Loess Plateau

Received: 14 January 2020 Published: 10 September 2020

Corresponding Authors: Laiming HUANG E-mail: huanglm@igsnrr.ac.cn

About author: ^*Corresponding author: HUANG Laiming (E-mail: huanglm@igsnrr.ac.cn)

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	Yanwu PEI
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Cite this article:

PEI Yanwu, HUANG Laiming, SHAO Ming'an, ZHANG Yinglong. Responses of Amygdalus pedunculata Pall. in the sandy and loamy soils to water stress. Journal of Arid Land, 2020, 12(5): 791-805.

URL:

http://jal.xjegi.com/10.1007/s40333-020-0016-7 OR http://jal.xjegi.com/Y2020/V12/I5/791

Table 1 Soil physical and chemical properties in the study area

Table 2 Soil water contents under different textural soils and water treatments

Fig. 1 Daily evaporation (a) and transpiration (b and c) from May to September in 2018. A and B represent the sandy soil and loamy soil, respectively. W₁, W₂, W₃, W₄ and W₅ denote the five levels of water treatment, which are respectively 90% (±5%) FC (field capacity), 75% (±5%) FC, 60% (±5%) FC, 45% (±5%) FC and 30% (±5%) FC. AW_μ and BW_μ respectively represent mean daily transpiration of the sandy soil and loamy soil under different water treatments. The abbreviations are the same as in Figures 2-4. Bars represent standard errors.

Table 3 Mean daily and cumulative transpirations under different textural soils and water treatments

Fig. 2 Plant height (a and b) and stem diameter (c and d) of A. pedunculata from May to September in 2018 under different textural soils and water treatments. Bars represent standard errors.

Table 4 Plant height (H) and stem diameter (D) under different textural soils and water treatments at the end of the growing season

Fig. 3 Aboveground (a) and belowground (b) biomasses, total biomass (c) and root to shoot ratio (d) of A. pedunculata under different textural soils and water treatments. Different lowercase letters represent significant differences among different water treatments within the same soil texture at P<0.05 level. Bars represent standard errors.

Fig. 4 Water use efficiency (WUE) of A. pedunculata under different textural soils and water treatments. Different lowercase letters indicate significant differences among different water treatments within the same soil texture at P<0.05 level. The horizontal dashed line represents mean WUE under different water treatments.


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