Responses of non-structural carbohydrates in Betula platyphylla leaves and fine roots to time since fire

doi:10.17521/cjpe.2023.0391

Abstract

Abstract:

Aims Fire is an important disturbance factor that limits plant growth and development, affects plant metabolism and even leads to plant mortality. Non-structural carbohydrates (NSC) mainly include soluble sugar (SS) and starch (ST), which play an important role in plant survival under disturbance. However, the response mechanism of plant NSC and its components to time since fire is unclear.

Methods In this study, five severely burned plots in Huzhong area of Da Hinggan Mountains with different postburn time and one adjacent unburned plot were selected for space-for-time substitution approach. Leaf, fine root and rhizosphere soil samples of Betula platyphylla were collected. The content of NSC and its components, the traits of leaf and fine root, and rhizosphere soil properties were measured.

Important findings The content of ST and NSC in B. platyphylla leaves decreased significantly, while the content of ST and NSC in fine roots increased significantly with increasing time since fire. The content of NSC in leaves and fine roots tend to be stable at 30 and 17 years after fire, respectively, and not differ from the unburned plot, indicating that the NSC of fine roots recovered faster from severe fire disturbance. Postburn time directly affect the NSC content of B. platyphylla leaves, and also has an indirect effect on the NSC content of leaves by affecting the specific leaf area. The effect of postburn time on NSC content in B. platyphylla fine roots is mediated by affecting soil pH and specific leaf area. In conclusion, the effect of postburn time on NSC content in plants differs among organs. This result contributes scientific data and theoretical basis to the study of vegetation restoration in burned areas.

Key words: restoration after fire, starch, soluble sugar, soil property

CAI Hui-Ying, LI Lan-Hui, LIN Yang, LIANG Ya-Tao, YANG Guang, SUN Long. Responses of non-structural carbohydrates in Betula platyphylla leaves and fine roots to time since fire[J]. Chin J Plant Ecol, 2024, 48(6): 780-793.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2023.0391

https://www.plant-ecology.com/EN/Y2024/V48/I6/780

Figures/Tables 6

Table 1 Basic information of the plots in the study area of Huzhong, Da Hinggan Mountains

地点 Site	起火时间(年) Burning time (year)	火后时间 Time since fire (a)	经度 Longitude (° E)	纬度 Latitude (° N)
雄关-2#线 Xiongguan-2#line	2020	1	123.81	51.61
白鲁山-10#线 Bailu Mountain-10#line	2017	4	123.26	52.17
雄关-6#线 Xiongguan-6#line	2012	9	123.70	51.58
白鲁山-19#线 Bailu Mountain-10#line	2004	17	123.06	52.31
提阳山-52#线 Tiyang Mountain-52#line	1991	30	124.08	52.04
S218西南 S218 southwest	未火烧 Unburned (CK)	~100	123.60	52.04

Fig. 1 Changes in content of non-structural carbohydrates (NSC) and its components in Betula platyphylla leaves and fine roots with time since fire (mean ± SE). Different lowercase letters indicate significant differences among different fire times in the same organ and component (p < 0.05), different uppercase letters indicate significant differences between leaves and fine roots in the same time and component (p < 0.05). ST, soluble sugar; SS, starch.

Fig. 2 Correlation of non-structural carbohydrates (NSC) and its component content in leaves and fine roots of Betula platyphylla with soil properties.

Fig. 3 Correlation of non-structural carbohydrates (NSC) and its component content in leaves and fine roots of Betula platyphylla with plant morphology and structural traits.

Fig. 4 Correlation of non-structural carbohydrates (NSC) and its component content in leaves and fine roots of Betula platyphylla with phytochemical traits.

Fig. 5 Effects of time since fire, soil properties, plant trait on non-structural carbohydrates (NSC) content of leaves (A, C) and fine roots (B, D) of Betula platyphylla. The solid line indicates that the causal relationship between variables is significant (p < 0.05), and the dashed line indicates that it is not significant (p > 0.05), the numbers on the lines represent the path coefficients. Bar charts show direct and indirect effects. The black bars represent the direct effects of time since fire, soil properties and plant traits on NSC content, respectively, and the gray bars indicate the indirect effects of time since fire on NSC content. CFI, comparative fit index; SRMR, standardized root mean square residual. *, p < 0.05; ***, p < 0.001.

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