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Soil net methane uptake rates in response to short-term litter input change in a coniferous forest ecosystem of central China

文献类型：期刊论文

作者Wu, Junjun1; Lu, Meng2; Fenga, Jiao1; Zhang, Dandan1,3; Chen, Qiong1,3; Li, Qianxi1; Long, Chunyan1,3; Zhang, Quanfa1; Cheng, Xiaoli1,2
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2019-06-15
卷号271页码:307-315
关键词Coniferous forest Litter input manipulations Methane uptake Methanotrophs Soil moisture
ISSN号0168-1923
DOI10.1016/j.agrformet.2019.03.017
英文摘要The uptake of CH4 by well-drained soil plays a vital role in mitigating the atmospheric CH4, but the impacts of shift in plant litter input on uptake of CH4 and the underlying mechanism are not fully understood. Here, we conducted in situ measurements of soil CH4 flux rates monthly throughout the year after the short-term litter input manipulations (i.e. Detritus Input and Removal Treatment-DIRT: control, CK; double litter, DL; no litter, NL; no roots, NR; and no aboveground litter and no roots, NRNL) in a coniferous forest (Platycladus orientalis (Linn.) Franco) ecosystem in subtropical China. The associated microclimates, soil properties and microbial PLFAs were also measured. Our results showed that soils acted as CH4 sink in all litter manipulation treatments, and the CH4 sink capacity significantly differed under litter manipulation treatments. Based on annual average values, net CH4 uptake rates decreased by 37.7 +/- 4.9% and 41.7 +/- 5.8% in the NL and NRNL treatments (i.e. litter layer removal), respectively, compared to the CK treatment. Thus, the net CH4 uptake induced by litter layer approximately accounted for 37.7 +/- 4.9% of the total net CH4 uptake rate. The net CH4 uptake rate was not significantly influenced by the root exclusion (NR) treatment. In contrast, the effect of litter addition on net CH4 uptake rate was strongly depended on soil water content. During the dry season, litter addition did not significantly affect net CH4 uptake rate. In contrast, during the wet season, the net CH 4 uptake rate decreased by 47.1 +/- 4.9% in the DL treatment compared to the CK treatment. There was no significant difference in net CH4 uptake rate between dry and wet season under other litter input manipulation treatments. The net CH4 uptake rate was positively correlated with the abundance of methanotrophic bacteria across all litter input manipulation treatments, whereas the significant negative relationship between net CH4 uptake rate and water filled pore space (WFPS) was only found in the DL treatment. Overall, our results suggest that aboveground organic layer (i.e. litter) is more important in regulating the soils acting as atmospheric CH4 sink than roots, while the regulating function primarily depends on soil dry/wet conditions and the abundance of methanotrophic bacteria.
资助项目National Natural Science Foundation of China[31770563] ; National Natural Science Foundation of China[31470557] ; Strategic Priority Research Program B of the Chinese Academy of Sciences[XDB15010200]
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000468709200028
出版者ELSEVIER SCIENCE BV
源URL[http://202.127.146.157/handle/2RYDP1HH/7794]  
专题中国科学院武汉植物园
通讯作者Lu, Meng; 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.Yunnan Univ, Sch Ecol & Environm Sci, Kunming 650091, Yunnan, Peoples R China
3.Grad Univ Chinese Acad Sci, Beijing 10039, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Junjun,Lu, Meng,Fenga, Jiao,et al. Soil net methane uptake rates in response to short-term litter input change in a coniferous forest ecosystem of central China[J]. AGRICULTURAL AND FOREST METEOROLOGY,2019,271:307-315.
APA Wu, Junjun.,Lu, Meng.,Fenga, Jiao.,Zhang, Dandan.,Chen, Qiong.,...&Cheng, Xiaoli.(2019).Soil net methane uptake rates in response to short-term litter input change in a coniferous forest ecosystem of central China.AGRICULTURAL AND FOREST METEOROLOGY,271,307-315.
MLA Wu, Junjun,et al."Soil net methane uptake rates in response to short-term litter input change in a coniferous forest ecosystem of central China".AGRICULTURAL AND FOREST METEOROLOGY 271(2019):307-315.

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来源：武汉植物园

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