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| Titel |
Physical injury stimulates aerobic methane emissions from terrestrial plants |
| VerfasserIn |
Z.-P. Wang, J. Gulledge, J.-Q. Zheng, W. Liu, L.-H. Li, X.-G. Han |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 4 ; Nr. 6, no. 4 (2009-04-17), S.615-621 |
| Datensatznummer |
250003642
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| Publikation (Nr.) |
 copernicus.org/bg-6-615-2009.pdf |
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| Zusammenfassung |
| Physical injury is common in terrestrial plants as a
result of grazing, harvesting, trampling, and extreme weather events.
Previous studies demonstrated enhanced emission of non-microbial CH4
under aerobic conditions from plant tissues when they were exposed to
increasing UV radiation and temperature. Since physical injury is also a
form of environmental stress, we sought to determine whether it would also
affect CH4 emissions from plants. Physical injury (cutting) stimulated
CH4 emission from fresh twigs of Artemisia species under aerobic conditions. More
cutting resulted in more CH4 emissions. Hypoxia also enhanced CH4
emission from both uncut and cut Artemisia frigida twigs. Physical injury typically results
in cell wall degradation, which may either stimulate formation of reactive
oxygen species (ROS) or decrease scavenging of them. Increased ROS activity
might explain increased CH4 emission in response to physical injury and
other forms of stress. There were significant differences in CH4
emissions among 10 species of Artemisia, with some species emitting no detectable
CH4 under any circumstances. Consequently, CH4 emissions may be
species-dependent and therefore difficult to estimate in nature based on
total plant biomass. Our results and those of previous studies suggest that
a variety of environmental stresses stimulate CH4 emission from a wide
variety of plant species. Global change processes, including climate change,
depletion of stratospheric ozone, increasing ground-level ozone, spread of
plant pests, and land-use changes, could cause more stress in plants on a
global scale, potentially stimulating more CH4 emission globally. |
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