EMISSIONS OF SOIL GREENHOUSE GASES IN RESPONSE TO UNDERSTORY REMOVAL AND CASSIA ALATAADDITION IN AN EUCALYPTUS UROPHYLLA PLANTATION IN GUANGDONG PROVINCE, CHINA

doi:10.3773/j.issn.1005-264x.2009.06.001

Abstract

Abstract:

Aims CO₂, CH₄ and N₂O are important greenhouse gases, and they mainly come from soils in forest ecosystems. Our objective was to analyze the effects of removal of the understory and addition of Cassia alata on soil CO₂, CH₄ and N₂O emissions in Heshan Hilly Land Interdisciplinary Experimental Station, Chinese Academy of Sciences, Guangdong Province, China.
Methods CO₂, CH₄ and N₂O fluxes in a Eucalyptus urophylla plantation were measuredin situ using the static chamber technique from June 2007 to May 2008.
Important findings CO₂ fluxes stayed at a relatively high level during the rainy season and a lower level in the dry season, while CH₄ and N₂O fluxes varied widely in the rainy season and were stable in the dry season. Peak values of CO₂and CH₄appeared in the rainy season, while the peak value of N₂O flux was in the dry season (December). The E. urophylla plantation soil was a sink or source for CH₄ while consistently a source for CO₂and N₂O. Understory removal and C. alata addition significantly enhanced CO₂ (p<0.01) and N₂O fluxes (p<0.01), while decreasing or increasing CH₄ fluxes under the same treatments. Results indicated that soil temperature, soil moisture, NO₃-N and microbial biomass carbon (MBC) might be important variables for soil CO₂, CH₄ and N₂O fluxes.

Key words: greenhouse gas emissions, understory vegetation, Cassia alata, Eucalyptus urophylla plantation, forest soil

LI Hai-Fang, XIA Han-Ping, FU Sheng-Lei, ZHANG Xing-Feng. EMISSIONS OF SOIL GREENHOUSE GASES IN RESPONSE TO UNDERSTORY REMOVAL AND CASSIA ALATAADDITION IN AN EUCALYPTUS UROPHYLLA PLANTATION IN GUANGDONG PROVINCE, CHINA[J]. Chin J Plant Ecol, 2009, 33(6): 1015-1022.

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https://www.plant-ecology.com/EN/Y2009/V33/I6/1015

Figures/Tables 4

References 31

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变量 Variable	处理 Treatment				p
变量 Variable	A	B	C	CK	p
土壤温度 Soil temperature (℃)	23.07 ^{a b}	23.33^a	22.98^{a b}	22.68^b	<0.05
土壤湿度 Soil moisture (%)	17.27^a	14.08^b	16.72^a	17.24^a	<0.01
pH	4.25	4.17	4.21	4.26	ns
土壤有机C Soil organic carbon (%)	1.96^a	1.44^b	1.90^a	1.97^a	<0.05
NO₃-N (mg·kg^-1)	7.13^a	5.702^b	5.44^b	5.07^b	<0.05
NH₄-N (mg·kg^-1)	4.91	6.41	4.97	6.88	ns
根系生物量 Fine root biomass (g·m^-2)	116.15^b	156.502^b	360.01^a	352.02^a	<0.01
微生物碳 Microbial biomass carbon (mg·kg^-1)	398.02^a	329.34^{a b}	309.43^{a b}	219.15^b	<0.01

变量 Variable	处理 Treatment				p
变量 Variable	A	B	C	CK	p
土壤温度 Soil temperature (℃)	23.07 ^{a b}	23.33^a	22.98^{a b}	22.68^b	<0.05
土壤湿度 Soil moisture (%)	17.27^a	14.08^b	16.72^a	17.24^a	<0.01
pH	4.25	4.17	4.21	4.26	ns
土壤有机C Soil organic carbon (%)	1.96^a	1.44^b	1.90^a	1.97^a	<0.05
NO₃-N (mg·kg^-1)	7.13^a	5.702^b	5.44^b	5.07^b	<0.05
NH₄-N (mg·kg^-1)	4.91	6.41	4.97	6.88	ns
根系生物量 Fine root biomass (g·m^-2)	116.15^b	156.502^b	360.01^a	352.02^a	<0.01
微生物碳 Microbial biomass carbon (mg·kg^-1)	398.02^a	329.34^{a b}	309.43^{a b}	219.15^b	<0.01

因子 Factor	CO₂通量 CO₂flux (Y₁) (mg·m^-2·h^-1)	CH₄通量 CH₄flux (Y₂) (μg·m^-2·h^-1)	N₂O通量 N₂O flux (Y₃) (mg·m^-2·h^-1)
土壤温度 Soil temperature (X₁) (℃)	Y₁=35.91e^0.05^X₁ (R²=0.25; p<0.01;n=408)	Y₂=-31.34+1.40X₁ (R²=0.03; p<0.01;n=408)	Y₃=6.28+0.27X₁ (R²=0.07; p<0.01;n=408)
土壤湿度 Soil moisture (X₂) (%)	Y₁=94.73+1.76 X₂ (R²=0.04;p <0.01; n=408)	Y₂=-4.12+0.42X₂ (R²=0.08; p<0.01;n=408)	Y₃=18.46-0.31X₂ (R²=0.02; p<0.01;n=408)
NO₃-N (X₃) (mg·kg^-1)	–	–	Y₃=6.11+0.67X₃ (R²=0.31; p<0.05;n=6)
微生物C Microbial biomass carbon (X₄) (mg·kg^-1)	Y₁=84.35+0.16X₃ (R²=0.39; p<0.01;n=6)	–	–

因子 Factor	CO₂通量 CO₂flux (Y₁) (mg·m^-2·h^-1)	CH₄通量 CH₄flux (Y₂) (μg·m^-2·h^-1)	N₂O通量 N₂O flux (Y₃) (mg·m^-2·h^-1)
土壤温度 Soil temperature (X₁) (℃)	Y₁=35.91e^0.05^X₁ (R²=0.25; p<0.01;n=408)	Y₂=-31.34+1.40X₁ (R²=0.03; p<0.01;n=408)	Y₃=6.28+0.27X₁ (R²=0.07; p<0.01;n=408)
土壤湿度 Soil moisture (X₂) (%)	Y₁=94.73+1.76 X₂ (R²=0.04;p <0.01; n=408)	Y₂=-4.12+0.42X₂ (R²=0.08; p<0.01;n=408)	Y₃=18.46-0.31X₂ (R²=0.02; p<0.01;n=408)
NO₃-N (X₃) (mg·kg^-1)	–	–	Y₃=6.11+0.67X₃ (R²=0.31; p<0.05;n=6)
微生物C Microbial biomass carbon (X₄) (mg·kg^-1)	Y₁=84.35+0.16X₃ (R²=0.39; p<0.01;n=6)	–	–