白桦叶片和细根非结构性碳水化合物对火后时间的响应

doi:10.17521/cjpe.2023.0391

植物生态学报 ›› 2024, Vol. 48 ›› Issue (6): 780-793.DOI: 10.17521/cjpe.2023.0391 cstr: 32100.14.cjpe.2023.0391

白桦叶片和细根非结构性碳水化合物对火后时间的响应

蔡慧颖, 李兰慧, 林阳, 梁亚涛, 杨光, 孙龙^*()

东北林业大学林学院, 东北林业大学森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040

收稿日期:2023-12-27 接受日期:2024-02-20 出版日期:2024-06-20 发布日期:2024-02-22
通讯作者: *孙龙(sunlong365@126.com)
基金资助:
国家自然科学基金(32071777);中央高校基本科研业务费(2572021BA04)

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

CAI Hui-Ying, LI Lan-Hui, LIN Yang, LIANG Ya-Tao, YANG Guang, SUN Long^*()

College of Forestry, Key Laboratory of Sustainable Forest Ecosystem Management, Ministry of Education, Northeast Forestry University, Harbin 150040, China

Received:2023-12-27 Accepted:2024-02-20 Online:2024-06-20 Published:2024-02-22
Contact: *SUN Long(sunlong365@126.com)
Supported by:
National Natural Science Foundation of China(32071777);Fundamental Research Funds for the Central Universities(2572021BA04)

摘要/Abstract

摘要：

火是制约植物生长发育的重要干扰因子, 影响植物的生理代谢, 甚至导致植物死亡。非结构性碳水化合物(NSC)主要包括可溶性糖(SS)和淀粉(ST), 对植物在干扰下存活具有重要作用。然而, 关于植物NSC及其组分含量对火后时间响应机制的研究尚有不足。该研究采用“空间替代时间”的方法, 在大兴安岭呼中区选取5个不同火烧时间的重度火烧地块和1个临近的未火烧地块, 分别采集白桦(Betula platyphylla)的叶片、细根以及根际土壤样品, 测定白桦叶片和细根的NSC及其组分含量、白桦叶片和细根的性状特征, 以及根际土壤属性。结果表明: 白桦叶片ST和NSC含量随火后时间的增加显著降低, 而细根ST和NSC含量随火后时间的增加显著增加, 叶片和细根的NSC含量分别在火后30年和火后17年与火烧前无显著差异, 表明细根NSC含量从重度火烧干扰的影响中恢复得更快; 火后时间对白桦叶片的NSC含量有直接影响, 还通过影响比叶面积对叶片的NSC含量产生间接影响; 火后时间对白桦细根NSC含量的影响主要是通过影响土壤pH和比叶面积间接产生。综上, 火后时间对植物NSC含量的影响具有明显的器官差异性。该结果可为火烧迹地的植被恢复研究提供科学数据和理论基础。

关键词: 火后恢复, 淀粉, 可溶性糖, 土壤属性

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

蔡慧颖, 李兰慧, 林阳, 梁亚涛, 杨光, 孙龙. 白桦叶片和细根非结构性碳水化合物对火后时间的响应. 植物生态学报, 2024, 48(6): 780-793. DOI: 10.17521/cjpe.2023.0391

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. Chinese Journal of Plant Ecology, 2024, 48(6): 780-793. DOI: 10.17521/cjpe.2023.0391

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2023.0391

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

图/表 6

表1 大兴安岭呼中研究区样地的基本信息

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

图1 白桦叶片和细根非结构性碳水化合物(NSC)及其组分含量随火后时间的变化(平均值±标准误)。不同小写字母表示同一器官同一组分在不同火烧时间差异显著(p < 0.05), 不同大写字母表示同一时间同一组分叶片和细根间差异显著(p < 0.05)。

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.

图2 白桦叶片和细根非结构性碳水化合物(NSC)及其组分含量与土壤属性的相关性。

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

图3 白桦叶片和细根非结构性碳水化合物(NSC)及其组分含量与植物形态与结构性状的相关性。

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.

图4 白桦叶片和细根非结构性碳水化合物(NSC)及其组分含量与植物化学性状的相关性。

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

图5 火后时间、土壤属性和植物性状对白桦叶片(A、C)和细根(B、D)非结构性碳水化合物(NSC)含量的影响。实线表明变量间因果关系显著(p < 0.05), 虚线表明因果关系不显著(p > 0.05), 线条上数字代表路径系数。条形图表明直接和间接影响, 黑色条表示火后时间、土壤属性和植物性状分别对NSC含量的直接影响, 灰色条表示火后时间对NSC含量的间接影响。CFI, 比较拟合指数; SRMR, 标准化均方根残差。*, p < 0.05; ***, p < 0.001。

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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白桦叶片和细根非结构性碳水化合物对火后时间的响应

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

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