Response of functional characters of Artemisia ordosica at different ages to drought in Mu Us Sandy Land

doi:10.7522/j.issn.1000-694X.2023.00085

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (2): 90-98.DOI: 10.7522/j.issn.1000-694X.2023.00085

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Response of functional characters of Artemisia ordosica at different ages to drought in Mu Us Sandy Land

Jianling Zhang¹(), Minghan Yu¹(), Huiyuan Sun¹, Yingying He², Fuchong Zhang¹

^1.Key Laboratory of State Forestry Administration on Soil and Water Conservation / MOE Engineering Research Center of Forestry Ecological Engineering / Yanchi Ecology Research Station of the Mu Us Desert，Beijing Forestry University，Beijing 100083，China
^2.College of Forestry and Prataculture，Ningxia University，Yinchuan 750021，China

Received:2023-07-11 Revised:2023-09-11 Online:2024-03-20 Published:2024-03-19
Contact: Minghan Yu

Abstract

Abstract:

The purpose of this study was to explore the response and age class differences of desert plant of twig and leaf functional traits to drought stress， and to provide theoretical basis for understanding the adaptability of desert plants under extreme drought caused by changes in precipitation patterns and predicting the succession trend of desert plant. In this study， Artemisia ordosica， a typical sand plant in desert areas， was selected as the research object. There were four rainfall gradients， including a control and rainfall reductions of 30%， 50% and 70%， each with three replications. The growth environment of mild， moderate and extreme drought was simulated. On the basis of morphological characteristics， the main twig and leaf functional trait in different age class were studied. Results showed that：（1） A. ordosica could respond to drought stress by increasing leaf thickness， reducing the leaf number， increasing the twig cross-sectional area， reducing the twig length and increasing huber value. （2） Plants of different ages had natural differences in functional traits of twig and leaf. The leaf thickness， total leaf area， leaf number， twig cross-sectional area and twig length were significantly higher in older plants than in younger class. （3） A. ordosica has different responses to precipitation changes in different age class， and low-age A. ordosica mainly regulates specific leaf area， total leaf area， and leafing intensity under adversity. With the increase of age grade， the main regulating functional trait of A. ordosica was the huber value， and the drought resistance of A. ordosica was increased by increasing the potential of water supply from twigs to leaves.

Key words: Artemisia ordosica, age class, drought stress, specific leaf area, huber value

CLC Number:

Q948.1

Jianling Zhang, Minghan Yu, Huiyuan Sun, Yingying He, Fuchong Zhang. Response of functional characters of Artemisia ordosica at different ages to drought in Mu Us Sandy Land[J]. Journal of Desert Research, 2024, 44(2): 90-98.

Figures/Tables 8

Fig.1 The location of study area and the sample plots layout

Table 1 The age-class structure of Artemisiaordosica population

龄级	有无繁殖枝	体积/m³
低龄级	无	≤0.05
中龄级	有	0.05~0.2
高龄级	有	>0.2

Fig.2 Soil water content at the depth of 40-60 cm under different rainfall treatments

Table 2 Twig and leaf functional traits of Artemisia ordosica

枝叶性状	数值
枝叶性状	平均数	最小值	最大值	中位数	标准差	变异系数/%
小枝叶片数量LN/片	46.86	9	119	46	26.71	57.00
小枝叶片总面积TLA/cm²	29.29	7.12	60.06	28.93	14.39	49.13
比叶面积SLA/(cm²·g^-1)	106.59	45.38	316.08	96.87	42.49	39.87
出叶强度LI/(n·g^-1)	75.25	32.40	135.29	71.49	23.79	31.61
叶干物质量LDMC/(g·g^-1)	0.24	0.13	0.40	0.24	0.06	23.08
叶片厚度LT/mm	0.47	0.35	0.58	0.48	0.05	9.71
茎干物质量SDMC/(g·g^-1)	0.37	0.14	0.57	0.38	0.10	25.73
枝条横截面积TCSA/cm²	0.04	0.01	0.09	0.04	0.02	46.26
枝条长度TSL/cm	33.41	14.00	68.00	33.00	11.47	34.33
胡伯尔值HV/(10^-2 cm²·cm^-2)	0.15	0.06	0.26	0.13	0.05	33.58

Fig.3 Characteristics of changes in leaf traits of Artemisia ordosica of different ages at different rainfall treatments. The ◆ on the box plot represents outliers. Different uppercase letters indicate significant differences of leaf traits between different ages within the same rainfall treatment at P<0.05 level. Different lowercase letters indicate significant differences of leaf traits between different rainfall treatments within the same ages at P<0.05 level. *， P<0.05； **， P<0.01； ***， P<0.001； ns （non-significant）， not significant

Fig.4 Characteristics of changes in twig traits of Artemisia ordosica of different ages at different rainfall treatments. Different uppercase letters indicate significant differences of twig traits between different ages within the same rainfall treatment at P<0.05level. Different lowercase letters indicate significant differences of twig traits between different rainfall treatments within the same ages at P<0.05 level. *， P<0.05； **， P<0.01； ***， P<0.001； ns （non-significant）， not significant

Fig.5 Correlation among functional traits of Low-age plants （A）、Middle-age plants （B） and Older plants （C）. Solid lines indicate positive correlations； dashed lines indicate negative correlations. Line thickness represents the correlation coefficient （r） values. Black lines indicate significant correlations （P<0.05）

Table 3 Loadings and interpreted variance of functional traits of Artemisia ordosica at different ages in PCA

枝叶性状	低龄级			中龄级			高龄级
枝叶性状	PC1	PC2	PC3	PC1	PC2	PC3	PC1	PC2	PC3
小枝叶片数量LN	-0.35	0.30	-0.20	-0.37	0.25	0.01	-0.44	-0.16	0.12
小枝叶片总面积TLA	-0.45	-0.05	-0.36	-0.39	-0.05	0.39	-0.21	0.29	0.59
比叶面积SLA	-0.45	-0.14	0.06	-0.31	-0.38	0.33	-0.22	0.46	-0.01
出叶强度LI	-0.45	-0.06	0.28	-0.40	-0.23	-0.23	-0.37	0.25	-0.28
叶干物质量LDMC	0.24	0.41	-0.31	-0.03	0.56	-0.37	-0.17	-0.49	0.09
叶片厚度LT	0.05	-0.43	-0.34	0.34	-0.16	0.06	0.25	0.33	0.40
茎干物质量SDMC	0.16	0.46	-0.28	0.08	0.49	0.36	-0.13	-0.43	0.10
枝条横截面积TCSA	-0.06	-0.37	-0.58	0.32	-0.10	0.43	0.42	-0.05	0.37
枝条长度TSL	-0.21	0.27	-0.33	-0.18	0.37	0.46	-0.27	-0.23	0.49
胡伯尔值HV	0.37	-0.34	-0.15	0.44	-0.01	0.13	0.46	-0.17	-0.05
方差比例/%	33.89	30.36	15.19	40.85	21.93	13.90	35.24	29.76	13.96
累计贡献率/%	33.89	64.25	79.44	40.85	62.78	76.68	35.24	65.00	78.96

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Response of functional characters of Artemisia ordosica at different ages to drought in Mu Us Sandy Land

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