A remotely sensed pigment index reveals photosynthetic phenology in evergreen conifers

Gamon John A.; Huemmrich K. Fred; Wong Christopher Y. S.Ensminger IngoGarrity StevenHollinger David Y.Noormets AskoPenuelas Josep

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A remotely sensed pigment index reveals photosynthetic phenology in evergreen conifers

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In evergreen conifers, where the foliage amount changes little with season, accurate detection of the underlying "photosynthetic phenology" from satellite remote sensing has been difficult, presenting challenges for global models of ecosystem carbon uptake. Here, we report a close correspondence between seasonally changing foliar pigment levels, expressed as chlorophyll/carotenoid ratios, and evergreen photosynthetic activity, leading to a "chlorophyll/carotenoid index" (CCI) that tracks evergreen photosynthesis at multiple spatial scales. When calculated from NASA's Moderate Resolution Imaging Spectroradiometer satellite sensor, the CCI closely follows the seasonal patterns of daily gross primary productivity of evergreen conifer stands measured by eddy covariance. This discovery provides a way of monitoring evergreen photosynthetic activity from optical remote sensing, and indicates an important regulatory role for carotenoid pigments in evergreen photosynthesis. Improved methods of monitoring photosynthesis from space can improve our understanding of the global carbon budget in a warming world of changing vegetation phenology.

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《Proceedings of the National Academy of Sciences of the United States of America.》 |2016年第46期|13087-13092|共6页
作者
Gamon John A.; Huemmrich K. Fred; Wong Christopher Y. S.Ensminger IngoGarrity StevenHollinger David Y.Noormets AskoPenuelas Josep;
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作者单位

Univ Nebraska Lincoln, Sch Nat Resources, Ctr Adv Land Management Informat Technol, Lincoln, NE 68583 USA;

Univ Maryland Baltimore Cty, NASA Goddard Space Flight Ctr, Baltimore, MD 20771 USA;

Univ Toronto, Dept Biol, Mississauga, ON L5L 1C6, CanadaDecagon Devices Inc, Pullman, WA 99163 USAUS Forest Serv, Northern Res Stn, Durham, NH 03824 USANorth Carolina State Univ, Dept Forestry & Environm Resources, Raleigh, NC 27695 USACtr Ecol Res & Forestry Applicat CREAF CSIC, Global Ecol Unit, Consejo Super Invest Cient CSIC, Campus Bellaterra, Bellaterra 08193, Catalonia, Spain;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
carotenoid pigments; evergreen conifers; gross primary productivity; chlorophyll/carotenoid index; CCl;

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A remotely sensed pigment index reveals photosynthetic phenology in evergreen conifers

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