Methane Oxidation Flux in Volcanic Forest Soil of Different Geological Ages and Its Influencing Factors

doi:10.11924/j.issn.1000-6850.casb2021-1093

Abstract

Abstract:

Methane (CH₄), a potent greenhouse gas, contributes significantly to global warming, and forest soil is an important sink of atmospheric CH₄. This study was conducted to clarify the characteristics of methane oxidation fluxes in forest soil developed from volcanic rock parent materials of different geological ages, aiming to provide a scientific basis for the study of carbon cycle in temperate forest ecosystems. Three volcanoes of different geological ages in the Wudalianchi Volcanic Reserve were selected as research objects, and a hill of similar elevation in the same area with different genesis in the SKH Reserve was taken as control, to analyze the characteristics of soil methane oxidation fluxes and their influencing factors by using static chamber - gas chromatography method. The results showed that the total soil organic carbon content differed significantly (P<0.05) between the north and south slopes of different sampling sites, while there was remarkable changes between LHS (formed 300 years ago) and DJDB and BGLQ (formed 170000-190000 and 700000-800000 years ago, respectively), which showed a trend of gradual increase. The total soil nitrogen content differed significantly (P<0.05) between the north and south slopes, except that of LHS. Soil available nutrients’ contents of the north slope were higher than those of the south slope at different sampling sites, which showed gradual upward trends with geological ages. The diurnal fluctuation of methane oxidation fluxes, which were measured at LHS, DJDB, BGLQ and SKH, ranged from 44.58-68.35, 108.65-138.23, 74.72-118.05 and 78.26-105.34 µg/(m²·h), respectively; and the methane oxidation fluxes reached the peak from 8 a.m. to 10 a.m.. The diurnal average value of methane oxidation fluxes was the highest at DJDB, which differed significantly from that of the other sampling sites (P<0.05). The monthly variation trends of methane oxidation fluxes in the north and south slopes were similar, which showed a single-peak curve pattern, and the peak of methane oxidation fluxes was observed in June. The annual variation of methane oxidation fluxes of DJDB was remarkably higher than that of LHS and BGLQ (P<0.05). Soil methane oxidation fluxes showed a significantly exponential correlation with soil temperature at 0-5 cm, and a linear correlation with soil water content at 0-5 cm. In summary, the differences of volcanic eruption periods determined the differences of soil nutrients’ contents. Pedogenesis processes could lead to the convergence of soil nutrients’ contents and physicochemical properties of different parent materials. The diurnal of methane oxidation fluxes generally manifested a higher value in the daytime and a lower value in the night. The ages of soil development influenced soil CH₄ oxidation fluxes which were affected by multiple environmental factors.

Key words: geological ages, volcano, forest soil, methane oxidation flux, temporal dynamics, Wudalianchi

CLC Number:

Q938.1

SHA Gang, YIN Hongbin, CAO Hongjie, XIE Lihong, HUANG Qingyang, XU Mingyi. Methane Oxidation Flux in Volcanic Forest Soil of Different Geological Ages and Its Influencing Factors[J]. Chinese Agricultural Science Bulletin, 2022, 38(31): 83-92.

Figures/Tables 10

References 40

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采样点	形成时间	植被类型	土壤类型
老黑山(LHS)	300年	针阔混交林	火山灰土、火山石质土
东焦得布山(DJDB)	17万~19万年	落叶阔叶林	火山灰土、暗棕壤性火山灰土
北格拉球山(BGLQ)	70万~ 80万年	落叶阔叶林	火山灰土、暗棕壤性火山灰土
山口湖(SKH)	25亿年	落叶阔叶林	暗棕壤

采样点	形成时间	植被类型	土壤类型
老黑山(LHS)	300年	针阔混交林	火山灰土、火山石质土
东焦得布山(DJDB)	17万~19万年	落叶阔叶林	火山灰土、暗棕壤性火山灰土
北格拉球山(BGLQ)	70万~ 80万年	落叶阔叶林	火山灰土、暗棕壤性火山灰土
山口湖(SKH)	25亿年	落叶阔叶林	暗棕壤

采样点	a		b		参数
	a		b		N	R²		P
	S	N	S	N	N	S	N	S	N
LHS	18.922	13.605	0.0513	0.0819	14	0.4268	0.6293	<0.007	<0.002
DJDB	23.663	27.042	0.1069	0.1069	14	0.7558	0.5766	<0.001	<0.003
BGLQ	27.818	25.794	0.0748	0.1081	14	0.7014	0.8206	<0.001	<0.001
SKH	28.352	27.65	0.0835	0.0865	14	0.7403	0.5089	<0.001	<0.005

采样点	a		b		参数
	a		b		N	R²		P
	S	N	S	N	N	S	N	S	N
LHS	18.922	13.605	0.0513	0.0819	14	0.4268	0.6293	<0.007	<0.002
DJDB	23.663	27.042	0.1069	0.1069	14	0.7558	0.5766	<0.001	<0.003
BGLQ	27.818	25.794	0.0748	0.1081	14	0.7014	0.8206	<0.001	<0.001
SKH	28.352	27.65	0.0835	0.0865	14	0.7403	0.5089	<0.001	<0.005

采样点	a		b		参数
	a		b		N	R²		P
	S	N	S	N	N	S	N	S	N
LHS	2.0468	-0.9592	13.325	54.002	14	0.3563	0.3352	<0.05	<0.05
DJDB	-3.0945	-2.3355	178.01	162.69	14	0.14	0.5306	>0.05	<0.01
BGLQ	-4.259	-1.5426	188.57	145.54	14	0.3877	0.241	<0.05	>0.05
SKH	-2.4915	-1.371	138.37	122.08	14	0.2776	0.1508	>0.05	>0.05