Afforestation enhanced soil CH4 uptake rate in subtropical China: Evidence from carbon stable isotope experiments

doi:10.1016/j.soilbio.2017.12.017

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	Afforestation enhanced soil CH4 uptake rate in subtropical China: Evidence from carbon stable isotope experiments
	Zhang, Quanfa 1; Wu, Junjun 1; Li, Qianxi 1; Chen, Jingwen 1,2; Lei, Yao 1; Zhang, Qian 1,2; Yang, Fan 1,2; Zhang, Dandan 1,2; Cheng, Xiaoli 1
刊名	SOIL BIOLOGY & BIOCHEMISTRY
	2018-03-01
卷号	118 页码:199-206
关键词	Afforestation Carbon isotope Methane uptake rate Soil properties
ISSN号	0038-0717
DOI	10.1016/j.soilbio.2017.12.017
英文摘要	Afforestation plays an important role in regulating the methane (CH4) exchange between soil and atmosphere. However, it is not fully understood how afforestation affects soil CH4 flux and the carbon isotopic signature of CH4. We conducted a year-long measurement of CH4 in afforested land (woodland and shrubland) and the adjacent cropland using the static chamber-gas chromatographic technique in the Danjiangkou Reservoir of central China. The soil exclusively functioned as a sink for atmospheric CH4 through the entire study period across land use types. Land use types significantly impacted the CH4 uptake rate with the largest average CH4 uptake rate in the shrubland (37.22 mu g m(-2).h(-1)), followed by the woodland (27.75 mu g m(-2).h(-1)) and the cropland (14.34 mu g m(-2).h(-1)). The mean annual CH4 uptake rates increased in the shrubland by 186.3% and the woodland by 93.5%, compared to the cropland. The isotope fractionation factor (alpha(soil)) was lower in the woodland and shrubland, compared to the cropland. The CH4 uptake rates and alpha(soil) exhibited similar seasonal patterns among land use types, with a higher CH4 uptake rates and lower alpha(soil) in spring and summer compared to other seasons. The CH4 uptake rates were positively related to microbial biomass carbon (MBC) and labile C. Meanwhile, the CH4 uptake rate was exponentially correlated with inorganic nitrogen (N) concentration, suggesting the high inorganic N concentration in the cropland possibly inhibited the CH4 uptake rate. In afforested land, CH4 uptake rates positively correlated with soil temperature and negatively correlated with the C: N ratio. The alpha(soil) was negatively related to soil temperature, whereas the delta C-13 values of CH4 remaining in the chambers were positively related to the delta C-13 values of soil organic carbon (SOC) and MBC. Our results suggest that the change in soil properties (i.e. high SOC and MBC, low C:N ratio and low inorganic N) following afforestation is a critical control on enhanced CH4 uptake capacity, while a lower alpha(soil) further provides evidence for a high CH4 uptake rate in afforested lands.
资助项目	National Natural Science Foundation of China[31470557] ; National Natural Science Foundation of China[31770563] ; Chinese Academy of Sciences[XDB15010200]
WOS研究方向	Agriculture
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000428490500022
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/5046]
专题	中国科学院武汉植物园
通讯作者	Cheng, Xiaoli
作者单位	1.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Hubei, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 10039, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Quanfa,Wu, Junjun,Li, Qianxi,et al. Afforestation enhanced soil CH4 uptake rate in subtropical China: Evidence from carbon stable isotope experiments[J]. SOIL BIOLOGY & BIOCHEMISTRY,2018,118:199-206.
APA	Zhang, Quanfa.,Wu, Junjun.,Li, Qianxi.,Chen, Jingwen.,Lei, Yao.,...&Cheng, Xiaoli.(2018).Afforestation enhanced soil CH4 uptake rate in subtropical China: Evidence from carbon stable isotope experiments.SOIL BIOLOGY & BIOCHEMISTRY,118,199-206.
MLA	Zhang, Quanfa,et al."Afforestation enhanced soil CH4 uptake rate in subtropical China: Evidence from carbon stable isotope experiments".SOIL BIOLOGY & BIOCHEMISTRY 118(2018):199-206.