Effects of mild fire on soil respiration rate and abiotic factors in coastal sandy plantation

doi:10.17521/cjpe.2022.0130

Abstract

Abstract:

Aims This study aimed to explore change in soil respiration and its components after mild fire, as well as its influence on forest environmental factors, which could provide a scientific basis for the estimation of the soil carbon emission of coastal sandy plantation under the condition of forest fire disturbance.

Methods We conducted an experiment in the Casuarina equisetifolia plantation burnt area and the control plot to measure the total soil respiration rate (R_S) and heterotrophic respiration rate (R_H) in the coastal areas of southern Fujian from September 2019 to August 2020, using the LI-8100 soil carbon flux automatic measurement system. Meanwhile, the soil temperature at the depth of 10 cm (T₁₀), soil volumetric water content at the depth of 10 cm (W₁₀), and soil physical and chemical properties at the depth of 0-10 cm were measured, in order to explore the effects of mild fire on soil R_S, R_H and abiotic factors.

Important findings There were significant differences in soil respiration rate and its components between the burned area and the control area. Our results showed that the annual average soil R_S and R_H in the burned area were (2.37 ± 0.65) and (2.05 ± 0.63) μmol·m^-2·s^-1, respectively. In contrast, the annual average soil R_S and R_H in the control plot were (2.86 ± 1.08) and (2.51 ± 1.08) μmol·m^-2·s^-1, respectively. Soil respiration rate and its components were significantly correlated with soil temperatures in the two plots, except soil R_H in the control plot, but their relationships with soil moisture did not reach a significant level. There was significant positive correlation of soil respiration rate with dissolved organic carbon content, microbial biomass nitrogen content and dissolved organic nitrogen content, but significant negative correlation with microbial biomass carbon content. Overall, we found that mild burning inhibited soil respiration and its components in C. equisetifolia plantation, indicating that fire disturbance had an important impact on soil respiration and carbon cycle in forest ecosystems.

Key words: forest fire disturbance, soil respiration, heterotrophic respiration, soil temperature, soil water content

SHEN Jian, HE Zong-Ming, DONG Qiang, GAO Shi-Lei, LIN Yu. Effects of mild fire on soil respiration rate and abiotic factors in coastal sandy plantation[J]. Chin J Plant Ecol, 2023, 47(7): 1032-1042.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2022.0130

https://www.plant-ecology.com/EN/Y2023/V47/I7/1032

Figures/Tables 10

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样点 Site	平均树高 Mean tree height (m)	平均胸径 Mean DBH (cm)	土壤pH Soil pH	土壤密度 Soil density (g·cm^-3)	郁闭度 Canopy density	存活率 Survival rate (%)
火烧迹地 Burned plot	9.77 ± 0.40	11.13 ± 0.44	5.22 ± 0.14	1.29 ± 0.02	0.85	78.44
对照样地 Control plot	10.40 ± 0.42	12.87 ± 0.53	5.06 ± 0.04	1.24 ± 0.08	0.91	82.45

样点 Site	平均树高 Mean tree height (m)	平均胸径 Mean DBH (cm)	土壤pH Soil pH	土壤密度 Soil density (g·cm^-3)	郁闭度 Canopy density	存活率 Survival rate (%)
火烧迹地 Burned plot	9.77 ± 0.40	11.13 ± 0.44	5.22 ± 0.14	1.29 ± 0.02	0.85	78.44
对照样地 Control plot	10.40 ± 0.42	12.87 ± 0.53	5.06 ± 0.04	1.24 ± 0.08	0.91	82.45

样点 Site	休眠季 Dormant season		生长季 Growing season		全年 Whole year
样点 Site	R_S	R_H	R_S	R_H	R_S	R_H
火烧迹地 Burned polt	1.91 ± 0.37^Ab	1.55 ± 0.28^Ab	2.69 ± 0.61^Ba	2.41 ± 0.56^Ba	2.37 ± 0.65^Ba	2.05 ± 0.63^Ba
对照样地 Control plot	1.88 ± 0.32^Ac	1.53 ± 0.36^Ac	3.56 ± 0.87^Aa	3.22 ± 0.84^Aa	2.86 ± 1.08^Ab	2.51 ± 1.08^Ab

样点 Site	休眠季 Dormant season		生长季 Growing season		全年 Whole year
样点 Site	R_S	R_H	R_S	R_H	R_S	R_H
火烧迹地 Burned polt	1.91 ± 0.37^Ab	1.55 ± 0.28^Ab	2.69 ± 0.61^Ba	2.41 ± 0.56^Ba	2.37 ± 0.65^Ba	2.05 ± 0.63^Ba
对照样地 Control plot	1.88 ± 0.32^Ac	1.53 ± 0.36^Ac	3.56 ± 0.87^Aa	3.22 ± 0.84^Aa	2.86 ± 1.08^Ab	2.51 ± 1.08^Ab

项目 Item	是否断根 Trenched or not	样点 Site	休眠季 Dormant season	生长季 Growing season	全年 Whole year
土壤温度 Soil temperature (℃)	未断根 Untrenched	火烧迹地 Burned plot	15.84 ± 3.74^Ac	23.77 ± 3.08^Aa	20.47 ± 5.17^Ab
	未断根 Untrenched	对照样地 Control plot	15.13 ± 3.40^Ac	23.64 ±3.12^Aa	20.10 ± 5.30^Ab
	断根 Trenched	火烧迹地 Burned plot	16.05 ± 3.73^Ac	24.01 ± 3.16^Aa	20.63 ± 5.20^Ab
	断根 Trenched	对照样地 Control plot	15.35 ± 3.48^Ac	23.70 ± 3.15^Aa	20.22 ± 5.27^Ab
土壤含水量 Soil water content (%)	未断根 Untrenched	火烧迹地 Burned plot	4.58 ± 1.34^Aa	4.00 ± 1.76^Aa	4.25 ± 1.63^Aa
	未断根 Untrenched	对照样地 Control plot	3.45 ± 1.23^Ba	3.82 ± 1.75^Ba	3.67 ± 1.56^Ba
	断根 Trenched	火烧迹地 Burned plot	5.11 ± 1.47^Aa	4.47 ± 1.77^Aa	4.57 ± 1.76^Aa
	断根 Trenched	对照样地 Control plot	4.42 ± 1.64^Aa	5.34 ± 2.68^Aa	4.96 ± 2.35^Aa