The litter layer acts as a moisture-induced bidirectional buffer for atmospheric methane uptake by soil of a subtropical pine plantation
The litter layer acts as a moisture-induced bidirectional buffer for atmospheric methane uptake by soil of a subtropical pine plantation
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枯落物层充当亚热带松树人工林土壤吸收大气甲烷的湿气双向缓冲区
DOI：
10.1016/j.soilbio.2013.06.018
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发表时间：
2013-11
影响因子：
9.7
通讯作者：
王辉民
中科院分区：
文献类型：
--
作者：
王辉民
森林土壤是众所周知的大气甲烷（CH 4）的汇，但如何表面凋落物层控制气体扩散到矿物质土壤仍然不清楚。在潮湿的气候季节性降雨提供了一个独特的机会，研究吸收大气CH 4下的土壤水分含量（SWC）的范围很广。2005-2007年，我们在中国亚热带20年生湿地松种植园中采用枯枝落叶清除方法研究了这个问题。对照（FCK）和无凋落物（FLF）处理的土壤-大气CH 4通量及其差异（凋落物影响的CH 4通量，FCK-LF= FCK-FLF）均受土壤含水量的显著影响，而不受土壤温度的显著影响。当土壤含水量低于15.8vol%时，凋落物层减少了土壤对大气CH 4的吸收，当土壤含水量高于15.8vol%时，凋落物层增加了土壤对大气CH 4的消耗。我们的结论是，凋落物层作为一个水分诱导的双向缓冲大气CH 4吸收的土壤在亚热带潮湿的松树种植园。然而，凋落物层的去除有一个最小的影响（+0.7%），每年的大气CH 4吸收土壤，通过补偿效应在雨季和旱季。因此，在气候变化的背景下，未来SWC的变化将改变亚热带松林土壤吸收大气CH 4的强度。
Forest soils are well known sinks for atmospheric methane (CH4), but how the surface litter layer controls gas diffusion into the mineral soil is still unclear. Seasonal rainfall in the humid climate provides a unique opportunity to examine uptake of atmospheric CH4under a wide range of soil water content (SWC). We studied this question using a litter removal method in a 20-year-old slash pine (Pinus elliottii) plantation in subtropical China during 2005–2007. Soil-atmosphere CH4fluxes of the control (FCK) and litter-free (FLF) treatments and their differences (litter-affected CH4flux,FCK–LF=FCK−FLF) were all significantly influenced by SWC and not by soil temperature. Litter layer reduced atmospheric CH4uptake by soil when SWC was below 15.8 vol%, and increased atmospheric CH4consumption by soil when SWC was above this value. We concluded that the litter layer acts as a moisture-induced bidirectional buffer for atmospheric CH4uptake by soils in a subtropical humid pine plantation. However, the removal of the litter layer had a minimal effect (+0.7%) on annual atmospheric CH4uptake by soil, through compensating effects during the wet and dry seasons. Therefore, in the context of climate change, future changes in SWC will alter the strength of atmospheric CH4uptake by soils of subtropical pine plantations.
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影响因子：
5.2
作者：
Hammes, Karen;Schmidt, Michael W. I.;Ding, Luyi
通讯作者：
Ding, Luyi
DOI：
10.1139/x94-002
发表时间：
1994-01-01
期刊：
CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE
影响因子：
--
作者：
CASTRO, MS;PETERJOHN, WT;LEWIS, D
通讯作者：
LEWIS, D
影响因子：
2.2
作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
通讯作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
影响因子：
8.8
作者：
R. Striegl
通讯作者：
R. Striegl
影响因子：
3.7
作者：
L. Verchot;E. Davidson;J. H. Cattanio;I. Ackerman
通讯作者：
L. Verchot;E. Davidson;J. H. Cattanio;I. Ackerman