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Chinese Journal of Plant Ecology >

2009 , Vol. 33 >Issue 2: 270 - 282

DOI: https://doi.org/10.3773/j.issn.1005-264x.2009.02.004

Research Articles

EFFECTS OF SOLAR RADIATION ON NET ECOSYSTEM EXCHANGE OF BROADLEAVED-KOREAN PINE MIXED FOREST IN CHANGBAI MOUNTAIN, CHINA

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  • 1Institue of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
    2Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
    3Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China

Received date: 2008-03-26

  Accepted date: 2008-08-26

  Online published: 2009-03-31

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Abstract

Aims Solar radiation can affect net ecosystem exchange (NEE) of carbon dioxide of forests, because cloud cover alters solar radiation, which in turn alters other environmental factors such as temperature and vapor pressure deficit. Our objective was to analyze the effects of these changes on NEE of broadleaved-Korean pine (Pinus koraiensis) mixed forest in Changbai Mountain.

Methods Our analysis was based on 30-min flux data and routine meteorology data for mid-growing season (June to August) for 2003-2006.

Important findings Cloud cover significantly increased NEE. The light-saturated maximum photosynthetic rate was enhanced 34%, 25%, 4% and 11% on cloudy days compared with clear days in the four years of study. Relative irradiance and clearness index (kt) were important in quantifying the effects of cloud cover, cloud shape and cloud thickness on solar radiation. When ktwas about 0.5, NEE reached its maximum. When the relative irradiance was over the critical relative irradiance of 37%, NEE was enhanced; maximum NEE occurred at about 75%. Enhancement ofNEE was ascribed to increased canopy assimilation and decreased above-ground respiration, which resulted from increased diffuse radiation and decreased air temperature and vapor pressure deficit with increased cloudiness.

Key words： broadleaved-Korean pine mixed forest; net ecosystem exchange; clearness index; relative irradiance

Cite this article

ZHANG Mi, YU Gui-Rui, ZHANG Lei-Ming, SUN Xiao-Min, WEN Xue-Fa, HAN Shi-Jie . EFFECTS OF SOLAR RADIATION ON NET ECOSYSTEM EXCHANGE OF BROADLEAVED-KOREAN PINE MIXED FOREST IN CHANGBAI MOUNTAIN, CHINA[J]. Chinese Journal of Plant Ecology, 2009 , 33(2) : 270 -282 . DOI: 10.3773/j.issn.1005-264x.2009.02.004

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