کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4527535 1625806 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Wetland methane emissions altered by vegetation disturbance: An interaction between stem clipping and nutrient enrichment
ترجمه فارسی عنوان
انتشار گازهای گلخانه ای متان تالاب تغییر داده شده توسط اختلال پوشش گیاهی: یک تعامل بین قطع ساقه و غنی سازی مواد مغذی
کلمات کلیدی
متان؛ اختلال کارخانه؛ تالاب؛ متانوژن؛ Methanotrophs؛ DGGE
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
چکیده انگلیسی


• CH4 emissions are plant species specific.
• CH4 emissions from plants clipped below the water increased after three days.
• Neither stem clipping, or nutrient enrichment altered methane-microbial communities.
• Disturbance and N enrichment can interact to suppress CH4 emissions.

Plant-mediated transport is the dominant means of methane release from vegetated wetlands. Whether aboveground plant disturbances affect the emission of methane is largely unknown. We tested the effects of stem clipping on methane emissions from freshwater wetland mesocosms vegetated with Sagittaria lancifolia, Panicum hemitomon, Echinochloa walteri, or Eleocharis macrostachya under different nutrient regimes. Mesocosms vegetated with E. macrostachya showed an effect of treatments on CH4 emission which was elevated in high nutrient level treatment and suppressed in mid nutrient level treatment as compared to controls when the plant was clipped to 3 cm above water line. S. lancifolia and P. hemitomon showed a similar pattern, and E. walteri showed no response to treatments. Mean CH4 emission significantly differed between species, being up to 56% higher in mesocosms vegetated with P. hemitomon. Treatments where plants were clipped below the water line had low initial emission rates, but these increased after three days. Sediment samples were analyzed for patterns in the microbial functional genes mcrA (methanogens) and pmoA (methanotrophs), but no changes in microbial communities in response to treatments were observed. Changes in methane emissions due to plant disturbances in wetlands warrant further investigation, but this study demonstrates that the available nutrient pool must also be considered. Additionally, initial responses to treatments were observed, but these responses tended to dissipate after three days, emphasizing the importance of monitoring CH4 emissions over time rather than only observing initial responses. Our results suggest that nutrient enrichment alone can suppress CH4 emission, however interactions with plant disturbances can be of equal importance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 136, January 2017, Pages 205–211
نویسندگان
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