Global methane emission estimates from ultraviolet irradiation of terrestrial plant foliage

被引:63
作者
Bloom, A. Anthony [1 ]
Lee-Taylor, Julia [2 ]
Madronich, Sasha [2 ]
Messenger, David J. [1 ,3 ]
Palmer, Paul I. [1 ]
Reay, David S. [1 ]
McLeod, Andy R. [1 ]
机构
[1] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JN, Midlothian, Scotland
[2] NCAR, Div Atmospher Chem, Boulder, CO 80305 USA
[3] Univ Edinburgh, Inst Mol Plant Sci, Sch Biol Sci, Edinburgh EH9 3JH, Midlothian, Scotland
基金
英国自然环境研究理事会; 美国国家科学基金会;
关键词
foliage; methane (CH4); pectin; ultraviolet radiation; vegetation; ATMOSPHERIC METHANE; B RADIATION; TEMPERATURE; PECTIN; COMMUNITIES; RELEASE; TREES;
D O I
10.1111/j.1469-8137.2010.03259.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Several studies have reported in situ methane (CH4) emissions from vegetation foliage, but there remains considerable debate about its significance as a global source. Here, we report a study that evaluates the role of ultraviolet (UV) radiation-driven CH4 emissions from foliar pectin as a global CH4 source. We combine a relationship for spectrally weighted CH4 production from pectin with a global UV irradiation climatology model, satellite-derived leaf area index (LAI) and air temperature data to estimate the potential global CH4 emissions from vegetation foliage. Our results suggest that global foliar CH4 emissions from UV-irradiated pectin could account for 0.2-1.0 Tg yr-1, of which 60% is from tropical latitudes, corresponding to < 0.2% of total CH4 sources. Our estimate is one to two orders of magnitude lower than previous estimates of global foliar CH4 emissions. Recent studies have reported that pectin is not the only molecular source of UV-driven CH4 emissions and that other environmental stresses may also generate CH4. Consequently, further evaluation of such mechanisms of CH4 generation is needed to confirm the contribution of foliage to the global CH4 budget.
引用
收藏
页码:417 / 425
页数:9
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