千烟洲红壤丘陵区人工针叶林土壤CH4排放通量

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

摘要/Abstract

摘要：

CH₄在温室效应中起着重要作用,为估算中亚热带CH₄的源汇现状,评价森林生态系统对温室效应的影响,采用静态箱-气相色谱法研究了千烟洲红壤丘陵区人工针叶林的土壤CH₄排放通量特征及水热因子对其的影响。对2004年9月~2005年12月期间的观测结果分析表明:千烟洲人工针叶林土壤总体表现为大气CH₄的吸收汇,原状林地土壤(Forest soil)情况下,CH₄通量的变化为7.67~-67.17 μg·m^-2·h^-1,平均为-15.53 μg·m^-2·h^-1;无凋落物处理(Litter-free)情况下,CH₄通量的变化是9.31~-90.36 μg·m^-2·h^-1,平均为-16.53 μg·m^-2·h^-1。二者对土壤CH₄的吸收表现出明显的季节变化规律,秋>夏>冬>春,但无凋落物处理CH₄变化幅度较原状林地土壤大,无凋落物处理吸收高峰出现在10月,最低值出现在翌年3月,原状林地土壤则分别在9月和翌年2月,均提前1个月。对土壤CH₄吸收通量与温度和湿度的相关分析表明:无论是原状林地土壤还是无凋落物处理情况下,土壤CH₄通量都与地下5 cm的温度和湿度相关性最高。偏相关分析反映了不同季节水热配置对土壤吸收CH₄通量的影响:冬季为12月~翌年2月,温度起主要作用;雨季3~6月,温度作用为主,随着温度的升高而升高,水分作用微弱;7~8月,CH₄吸收通量随着湿度的降低而增加,但高温限制了CH₄的吸收;秋季(9~11月)水热配置适宜,CH₄通量达到高峰值。总之,CH₄吸收通量随着温度的升高和湿度的降低而增大,但温度过高会抑制其吸收。

关键词: CH₄通量, 静态箱法, 中亚热带森林土壤, 温室气体

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

刘玲玲, 刘允芬, 温学发, 王迎红. 千烟洲红壤丘陵区人工针叶林土壤CH₄排放通量. 植物生态学报, 2008, 32(2): 431-439. DOI: 10.3773/j.issn.1005-264x.2008.02.022

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. Chinese Journal of Plant Ecology, 2008, 32(2): 431-439. DOI: 10.3773/j.issn.1005-264x.2008.02.022

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https://www.plant-ecology.com/CN/Y2008/V32/I2/431

图/表 8

参考文献 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

千烟洲红壤丘陵区人工针叶林土壤CH₄排放通量

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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