武夷山亚高山草甸土壤呼吸组分特征及影响因素

doi:10.17521/cjpe.2024.0178

植物生态学报 ›› 2025, Vol. 49 ›› Issue (3): 502-512.DOI: 10.17521/cjpe.2024.0178 cstr: 32100.14.cjpe.2024.0178

• 研究论文 • 上一篇

武夷山亚高山草甸土壤呼吸组分特征及影响因素

葛小彩¹, 李锦隆¹, 孙俊²^,³, 武盼盼¹, 胡丹丹¹^,²^,^*(), 程栋梁¹^,², 钟全林¹^,²

¹福建师范大学地理研究所, 福州 350007
²福建师范大学福建省植物生理生态重点实验室, 福州 350007
³安庆师范大学资源环境学院, 安徽安庆 246133

收稿日期:2024-05-28 接受日期:2024-10-09 出版日期:2025-03-20 发布日期:2024-10-11
通讯作者: * 胡丹丹(hudanworld@126.com)
基金资助:
国家自然科学基金(32071555);国家自然科学基金(32001294);国家自然科学基金(31971643);福建省科技厅公益类重点项目(2022R1002002)

Characteristics of soil respiration components and influencing factors in the subalpine meadows of Wuyi Mountain

GE Xiao-Cai¹, LI Jing-Long¹, SUN Jun²^,³, WU Pan-Pan¹, HU Dan-Dan¹^,²^,^*(), CHENG Dong-Liang¹^,², ZHONG Quan-Lin¹^,²

¹Institute of Geography, Fujian Normal University, Fuzhou 350007, China
²Fujian Key Laboratory of Plant Physiology and Ecology, Fujian Normal University, Fuzhou 350007, China
³School of Resources and Environment, Anqing Normal University, Anqing, Anhui 246133, China

Received:2024-05-28 Accepted:2024-10-09 Online:2025-03-20 Published:2024-10-11
Contact: * HU Dan-Dan(hudanworld@126.com)
Supported by:
National Natural Science Foundation of China(32071555);National Natural Science Foundation of China(32001294);National Natural Science Foundation of China(31971643);Key Public Welfare Project of Fujian Provincial Department of Science and Technology(2022R1002002)

摘要/Abstract

摘要： 武夷山亚高山草甸是亚热带中国东南部地区分布海拔最高的草甸, 分析亚热带亚高山草甸土壤碳通量组分的变化特征, 探究其与环境因子的关系及温度敏感性(Q₁₀), 对准确估计区域土壤碳收支和完善对亚高山草甸碳通量的认识具有重要意义。于2020年5月至2021年4月采用LI-8100 CO₂通量测定仪对武夷山山顶草甸土壤呼吸速率(RS)进行监测, 并利用根去除法区分自养呼吸速率(RA)和异养呼吸速率(RH)。结果显示: (1)亚热带武夷山亚高山草甸土壤呼吸速率及组分动态均呈双峰曲线, 5-10月, RS、RA、RH均高于其他月份。全年RA的变异幅度大于RH, RA在RS中占比约45%。(2)多模型比较分析表明武夷山亚高山草甸土壤温度(T)与土壤呼吸速率及组分呈指数增长关系, 土壤呼吸速率及各组分的Q₁₀排序为RA (Q₁₀= 1.96) > RS (Q₁₀= 1.94) > RH (Q₁₀= 1.67)。土壤湿度(W)对RS有一定影响, 但与RA、RH关系不显著。T、W双因素模型对RS的拟合优于单因素模型, 二者可共同解释48%的RS变异。综上, 武夷山亚高山草甸土壤呼吸以异养呼吸为主, 自养呼吸比异养呼吸对温度更敏感, 土壤温度和湿度是影响武夷山亚高山草甸土壤呼吸的重要环境因子, 低温和湿度大对土壤呼吸有抑制作用。该研究有助于增强对亚高山草甸土壤呼吸及组分季节动态和影响因素的认识, 为区域土壤碳通量和碳循环研究提供数据支持。

关键词: 土壤呼吸, 自养呼吸, 异养呼吸, 温度敏感性, 亚高山草甸

Abstract:

Aims The subalpine meadow of Wuyi Mountain is the highest meadows in the subtropical region of southeastern China. Identifying the variation characteristics of soil carbon flux components, and exploring their relationships with environmental factors and temperature sensitivity (Q₁₀) are of great significance for accurately estimating regional soil carbon balance and improving the knowledge about carbon flux dynamics in subalpine meadows.
Methods From May 2020 to April 2021, the LI-8100 CO₂ flux analyzer was utilized to systematically monitor the soil respiration rate (RS) in the meadow located at the summit of Wuyi Mountain. Additionally, the root exclusion method was applied to distinguish between the autotrophic respiration rate (RA) and heterotrophic respiration rate (RH).
Important findings (1) The dynamics of RS, RA and RH followed bimodal patterns, with consistently higher rates record from May to October compared to other months. Notably, the RA exhibited greater variability than RH throughout the year, accounting for 45% of RS. (2) A multi-model comparative analysis suggested that the temperature (T) exhibited an exponential correlation with soil respiration rate and its components in the subalpine meadow soil of Wuyi Mountain. The ranking of Q₁₀ values for soil respiration rate and its components was RA (Q₁₀= 1.96) > RS (Q₁₀= 1.94) > RH (Q₁₀= 1.67). Although soil moisture (W) had a certain effect on RS, there was no significant relationship between RA and RH. The two-factor models including both T and W provided a better fit for RS than single-factor models, jointly explaining 48% of the variation in RS. In conclusion, soil respiration was primarily driven by heterotrophic respiration, while autotrophic respiration was more sensitive to temperature. Additionally, soil temperature and humidity were crucial environmental factors influencing soil respiration in the subalpine meadow of Wuyi Mountain, with soil respiration inhibited by low temperatures and high humidity. This study contributes to enhancing our understanding of the seasonal dynamics and influencing factors of soil respiration and its components in the subalpine meadow, providing valuable insights for regional soil carbon flux and carbon cycle research.

Key words: soil respiration, autotrophic respiration, heterotrophic respiration, temperature sensitivity (Q₁₀), subalpine meadow

葛小彩, 李锦隆, 孙俊, 武盼盼, 胡丹丹, 程栋梁, 钟全林. 武夷山亚高山草甸土壤呼吸组分特征及影响因素. 植物生态学报, 2025, 49(3): 502-512. DOI: 10.17521/cjpe.2024.0178

GE Xiao-Cai, LI Jing-Long, SUN Jun, WU Pan-Pan, HU Dan-Dan, CHENG Dong-Liang, ZHONG Quan-Lin. Characteristics of soil respiration components and influencing factors in the subalpine meadows of Wuyi Mountain. Chinese Journal of Plant Ecology, 2025, 49(3): 502-512. DOI: 10.17521/cjpe.2024.0178

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2024.0178

https://www.plant-ecology.com/CN/Y2025/V49/I3/502

图/表 5

图1 武夷山海拔2 100 m处土壤呼吸动态变化(平均值±标准误, n = 5)。RA, 自养呼吸速率; RH, 异养呼吸速率; RS, 土壤呼吸速率。

Fig. 1 Dynamics of soil respiration rates at an altitude of 2 100 m in Wuyi Mountain (mean ± SE, n = 5). RA, autotrophic respiration rate; RH, heterotrophic respiration rate; RS, soil respiration rate.

图2 武夷山海拔2 100 m处土壤温度、土壤湿度和降水量月动态。P, 降水量; T, 10 cm土壤温度; W, 10 cm土壤湿度。

Fig. 2 Monthly dynamics of soil temperature, soil moisture and precipitation at an altitude of 2 100 m in Wuyi Mountain. P, precipitation; T, soil temperature measured at depth of 10 cm in the soil layer; W, soil moisture measured at depth of 10 cm in the soil layer.

图3 土壤呼吸组分和土壤温度的指数拟合。RA, 自养呼吸速率; RH, 异养呼吸速率; RS, 土壤呼吸速率。

Fig. 3 Exponential fitting of soil respiration components to soil temperature. RA, autotrophic respiration rate; RH, heterotrophic respiration rate; RS, soil respiration rate.

表1 土壤呼吸组分与10 cm土壤温度的拟合关系(平均值±标准误, n = 5)

Table 1 Fitting relationships between soil respiration components and soil temperature at depth of 10 cm (mean ± SE, n = 5)

$R=aT+b$
T	R	a		b		R²		p
	RS	0.07 ± 0.01		0.55 ± 017		0.33		<0.001
	RH	0.05 ± 0.01		0.23 ± 0.13		0.29		<0.001
	RA	0.03 ± 0.01		0.22 ± 0.10		0.19		<0.001
$R=a{{(T+10)}^{b}}$
T	R	a		b		R²		p
	RS	0.02 ± 0.02		1.34 ± 0.25		0.38		<0.001
	RH	0.01 ± 0.01		1.45 ± 0.33		0.30		<0.001
	RA	0.01 ± 0.01		1.29 ± 0.37		0.20		<0.001
$R=a{{T}^{2}}+bT+c$
T	R	a	b		c		R²		p
	RS	-0.07 ± 0.06	0.007 ± 0.003		1.16 ± 0.31		0.38		<0.001
	RH	-0.03 ± 0.05	0.004 ± 0.002		0.59 ± 0.25		0.31		<0.01
	RA	-0.06 ± 0.04	0.004 ± 0.002		0.60 ± 0.18		0.27		<0.001
$R=a{{\text{e}}^{bT}}$
T	R	a	b		R²		p		Q₁₀
	RS	0.62 ± 0.10	0.08 ± 0.01		0.41		<0.001		1.94
	RH	0.34 ± 0.08	0.07 ± 0.02		0.31		<0.001		1.67
	RA	0.25 ± 0.06	0.06 ± 0.02		0.22		<0.001		1.96

表2 土壤总呼吸速率(RS)、自养呼吸速率(RA)、异养呼吸速率(RH)与10 cm土壤湿度(W)、土壤温度(T)和土壤湿度双因素的拟合关系(平均值±标准误, n = 5)

Table 2 Fitting relationships of soil respiration rate (RS), autotrophic respiration rate (RA), and heterotrophic respiration rate (RH) with soil moisture (W) and the dual factors of soil temperature and soil moisture at depth of 10 cm (mean ± SE, n = 5)

$R=a{{W}^{2}}+bW~+\ c~~$
W	R	a	b	c	R²	p
	RS	20.70 ± 7.03	-31.28 ± 10.59	-1.78 ± 1.12	0.14	<0.05
	RH	12.06 ± 5.82	-17.90 ± 8.72	-1.07 ± 0.92	0.05	>0.05
	RA	6.83 ± 3.94	-10.74 ± 5.92	-0.42 ± 0.62	0.04	>0.05
$R=a{{\text{e}}^{bT}}{{W}^{c}}$
T, W	R	a	b	c	R²	p
	RS	0.04 ± 0.12	0.07 ± 0.01	-0.36 ± 0.18	0.48	<0.001

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武夷山亚高山草甸土壤呼吸组分特征及影响因素

Characteristics of soil respiration components and influencing factors in the subalpine meadows of Wuyi Mountain

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