Difference in adaptation strategy between Haloxylon ammodendron and Alhagi sparsifolia to drought

doi:10.17521/cjpe.2021.0338

Abstract

Abstract:

Aims The plant mortality induced by drought has significant impact on forest ecosystems around the world. It thus has brought intensive research attention on the plant adaptive strategy to drought in the field of physiological ecology. This study aims to investigate the differences in adaptation strategies to drought between two dominant species in arid desert areas, i.e., Haloxylon ammodendron and Alhagi sparsifolia.

Methods Three types of functional traits (i.e., leaf, photosynthetic and hydraulic traits) of A. sparsifolia and H. ammodendron were measured in response to a natural drought gradient (mild, moderate and severe) in Ebinur Lake Nature Reserve in Xinjiang Province, China. The changes of functional traits with drought gradient, and the differences of functional traits and adaptation strategies to drought between the two species were analyzed.

Important findings The functional traits of A. sparsifolia and H. ammodendron changed differently across drought gradient. All the functional traits were significantly different between the two species except for leaf dry matter content. However, the differences in functional traits between the two species showed a decrease due to the synergetic influence of drought stress and species convergence. Pearson correlation among the traits for the two species indicated that only 10 pairs of functional traits are significantly correlated for A. sparsifolia, while 15 pairs were significantly correlated for H. ammodendron. Principal component analysis (PCA) showed that two typical trait combinations related to drought resistance can be obtained from 11 functional traits of H. ammodendron, namely drought resistance-carbon acquisition group and drought resistance group. However, the trait combinations in coping with drought were not identified for A. sparsifolia. The results suggested that A. sparsifolia,was a conservative species, having greater drought tolerance than H. ammodendron. The traits in A. sparsifolia was less associated than that in H. ammodendron. In contrast, H. ammodendron used the trade-offs and compensatory relationships among functional traits to reduce drought stress. This study provided insights into the relationship between functional traits and drought adaptation strategies of different plant life forms, which advanced the fundamental theories of plant physiological ecology, and provided implications and references for the protection and diversity maintenance of desert ecosystem.

Key words: leaf functional trait, photosynthetic parameter, hydraulic trait, drought stress, trait combination

ZHOU Jie, YANG Xiao-Dong, WANG Ya-Yun, LONG Yan-Xin, WANG Yan, LI Bo-Rui, SUN Qi-Xing, SUN Nan. Difference in adaptation strategy between Haloxylon ammodendron and Alhagi sparsifolia to drought[J]. Chin J Plant Ecol, 2022, 46(9): 1064-1076.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2021.0338

https://www.plant-ecology.com/EN/Y2022/V46/I9/1064

Figures/Tables 8

Fig. 1 Sample sites in study region of Ebinur Lake Basin. D1, D2, and D3 represent sampling plots with mild, moderate, and severe drought.

Table 1 Division of drought gradient of Ebinur Lake Basin (mean ± SD)

编号 Number	土壤含水量 Soil water content (%)	干旱程度 Drought level
D1	12.74 ± 1.25	轻度 Mild
D2	9.38 ± 0.80	中度 Moderate
D3	3.63 ± 0.66	重度 Severe

Fig. 2 Variance of leaf traits across the drought levels and between Alhagi sparsifolia (As) and Haloxylon ammodendron (Ha) (mean ± SD). D1, D2 and D3 are mild, moderate and severe drought, respectively. Uppercase letters are the result of one-way AVOVA, different letters show significant difference under different drought levels of same species (p < 0.05). Lowercase letters are the result of independent sample t test, different letters show significant difference between species under same drought level (p < 0.05).

Fig. 3 Variance of photosynthetic traits across the drought levels and between Alhagi sparsifolia (As) and Haloxylon ammodendron (Ha)(mean ± SD). D1, D2 and D3 are mild, moderate and severe drought, respectively. Uppercase letters are the result of one-way AVOVA, different letters show significant difference under different drought levels of same species (p < 0.05). Lowercase letters are the result of independent sample t test, different letters show significant difference between species under same drought level (p < 0.05).

Fig. 4 Variance of hydraulic traits across the drought levels and between Alhagi sparsifolia (As) and Haloxylon ammodendron (Ha)(mean ± SD). D1, D2 and D3 are mild, moderate and severe drought, respectively. Uppercase letters are the result of one-way AVOVA, different letters show significant difference under different drought levels of same species (p < 0.05). Lowercase letters are the result of independent sample t test, different letters show significant difference between species under same drought level (p < 0.05).

Table 2 Collaborative influences of drought level and species on functional traits of Alhagi sparsifolia and Haloxylon ammodendron tested using two-way ANOVA

功能性状 Functional trait		干旱程度×物种 Drought level × species
功能性状 Functional trait		F	p
叶性状 Leaf trait	叶厚或嫩枝叶直径 Leaf thickness or shoot diameter	0.43	0.81
	叶面积 Leaf area	0.30	0.75
	比叶面积 Specific leaf area	8.91	<0.01
	干物质含量 Dry matter content	1.22	0.54
光合性状 Photosynthetic trait	净光合速率 Net photosynthetic rate	0.85	0.66
	气孔导度 Stomatal conductance	1.89	0.39
	蒸腾速率 Transpiration rate	0.01	0.99
	水分利用效率 Water use efficiency	14.28	<0.01
水力性状 Hydraulic trait	叶水势 Leaf water potential	6.46	<0.05
	枝水势 Twig water potential	5.23	<0.05
	枝比导率 Twig specific hydraulic conductance	2.11	0.17

Fig. 5 Correlation among functional traits of Alhagi sparsifolia (As) and Haloxylon ammodendron (Ha). Cond, stomatal conductance; Ks, twig specific hydraulic conductance; LA, leaf area; LD, leaf diameter; LDMC, leaf dry matter content; LP, leaf water potential; LT, leaf thickness; Pn, net photosynthetic rate; SLA, specific leaf area; TP, twig water potential; Tr, transpiration rate; WUE, water use efficiency.

Fig. 6 Principal component (PC) analysis of 11 functional traits of Alhagi sparsifolia (A) and Haloxylon ammodendron (B) under drought stress. Cond, stomatal conductance; Ks, twig specific hydraulic conductance; LA, leaf area; LD, leaf diameter; LDMC, leaf dry matter content; LP, leaf water potential; LT, leaf thickness; Pn, net photosynthetic rate; SLA, specific leaf area; TP, twig water potential; Tr, transpiration rate; WUE, water use efficiency.

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