CH4 EMISSION FLUX FROM SOIL OF PINE PLANTATIONS IN THE QIAN- YANZHOU RED EARTH HILL REGION OF CHINA

doi:10.3773/j.issn.1005-264x.2008.02.022

Abstract

Abstract:

Aims Methane (CH₄) plays an important role in the greenhouse effects. Our objectives were to evaluate the CH₄ budget, understand seasonal variation of CH₄, and explore effects of temperature and moisture on CH₄ flux in a mid-subtropical pine plantation to provide data for estimating the influence of subtropical forest ecosystems on greenhouse effects.
Methods We analyzed CH₄ flux from soils in the Qianyanzhou red earth hill region of China for 16 months from September 2004 to December 2005, using a static chamber-gas chromatograph technique.
Important findings The soil of this type of pine plantation was a sink of CH₄ to the atmosphere as a whole; annual CH₄ flux ranged from 7.67 to -67.17 μg·m^-2·h^-1 with average of -15.530 μg·m^-2·h^-1 under a forest soil treatment and from 9.31 to -90.36 μg·m^-2·h^-1 with average of -16.53 μg·m^-2·h^-1 under a litter-free treatment. CH₄ absorption had similarly seasonal variations with a sequence of autumn > summer > spring > winter for both treatments, but differed in variation ranges and time. The litter-free soil had larger ranges of seasonal variations, maximum CH₄ sink was in October and minimum sink was in March. Meanwhile, the corresponding maximum and minimum CH₄ sinks in the forest soil were in the September and February, respectively, a month earlier than litter-free treatment. Analysis of correlations between CH₄ flux and temperature and moisture showed that CH₄ flux had a significant positive correlation to soil temperature at 5 cm depth and a significant negative correlation to soil water content at 5 cm depth. Partial correlations showed the combined effects of moisture and temperature on CH₄ flux in different seasons. Temperature was a limiting factor for soil absorption of CH₄ during winter (December to February), but soil absorption increased during the rainy season (March to May). From July to August, CH₄ absorption increased with the declining soil moisture but was restricted by high temperature. During the fall (September to November), CH₄ absorption reached the maximum value for suitable combined effects of temperature and moisture. In summary, CH₄ absorption increased with soil temperature and decreased with soil water content, but was restricted by high temperature.

Key words: methane flux, static closed chamber technique, mid-subtropical forest soil, greenhouse gas

LIU Ling-Ling, LIU Yun-Fen, WEN Xue-Fa, WANG Ying-Hong. CH₄ EMISSION FLUX FROM SOIL OF PINE PLANTATIONS IN THE QIAN- YANZHOU RED EARTH HILL REGION OF CHINA[J]. Chin J Plant Ecol, 2008, 32(2): 431-439.

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Figures/Tables 8

References 35

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季节 Seasons	原状林地土壤 Forest soil (μg·m^-2·h^-1)	CH₄通量占年吸收比例 Proportion of CH₄ flux in one year (%)	无凋落物处理 Litter-free (μg·m^-2·h^-1)	CH₄通量占年吸收比例 Proportion of CH₄ flux in one year (%)
春季 Spring	-10.56	18.29	-9.42	15.31
夏季 Summer	-15.25	26.43	-16.88	27.45
秋季 Autumn	-20.02	34.69	-24.97	40.59
冬季 Winter	-11.88	20.59	-10.24	16.65

季节 Seasons	原状林地土壤 Forest soil (μg·m^-2·h^-1)	CH₄通量占年吸收比例 Proportion of CH₄ flux in one year (%)	无凋落物处理 Litter-free (μg·m^-2·h^-1)	CH₄通量占年吸收比例 Proportion of CH₄ flux in one year (%)
春季 Spring	-10.56	18.29	-9.42	15.31
夏季 Summer	-15.25	26.43	-16.88	27.45
秋季 Autumn	-20.02	34.69	-24.97	40.59
冬季 Winter	-11.88	20.59	-10.24	16.65

	地下5 cm温度 Temperature at 5 cm depth	地表温度 Surface temperature	箱内温度 Temperature inside the chamber	箱外温度 Temperature outside the chamber
原状林地土壤CH₄通量 CH₄ flux under the treatment of forest soil	-0.469^**	-0.383	-0.354	-0.344
无凋落物处理CH₄通量 CH₄ flux under the treatment of litter-free	-0.525^**	-0.460^*	-0.444^*	-0.430^*

	地下5 cm温度 Temperature at 5 cm depth	地表温度 Surface temperature	箱内温度 Temperature inside the chamber	箱外温度 Temperature outside the chamber
原状林地土壤CH₄通量 CH₄ flux under the treatment of forest soil	-0.469^**	-0.383	-0.354	-0.344
无凋落物处理CH₄通量 CH₄ flux under the treatment of litter-free	-0.525^**	-0.460^*	-0.444^*	-0.430^*

	5 cm湿度 Moisture at 5 cm depth	20 cm湿度 Moisture at 20 cm depth	50 cm湿度 Moisture at 50 cm depth
原状林地土壤CH₄通量 CH₄ flux under the treatment of forest soil	0.781^***	0.578^**	0.324
无凋落物处理的CH₄通量 CH₄ flux under the treatment of litter-free	0.690^**	0.546^*	0.330

CH₄ EMISSION FLUX FROM SOIL OF PINE PLANTATIONS IN THE QIAN- YANZHOU RED EARTH HILL REGION OF CHINA

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	春季 Spring¹⁾	夏季 Summer²⁾	秋季 Autumn³⁾	冬季 Winter⁴⁾
5 cm温度 Temperature at 5 cm depth	-0.218 2	0.243 5	-0.195 2	-0.226 6
5 cm湿度 Moisture at 5 cm depth	-0.091 0	0.465 7^***	0.126 3	0.183 8

	春季 Spring¹⁾	夏季 Summer²⁾	秋季 Autumn³⁾	冬季 Winter⁴⁾
F	增加Increase	增加Increase	最大Max	最小Min
5T	增加Increase	最大Max	减少Decrease	最小Min
5M	最大Max	最小Min	增加Increase	增加Increase
T & M	土壤湿度过高作用微弱 Less effect by the high moisture	土壤温度过高限制 Restricted by the high temperature	水热配置适宜 Well interaction by the suitable temperature and moisture	土壤温度过低限制 Restricted by the low temperature

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