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杨晓亚,何乾,江晓东. 冬小麦净碳交换量和光能利用率对晴空指数变化的响应[J]. 科学技术与工程, 2020, 20(27): 11018-11024.
Yang Xiao-ya,何乾,江晓东.Response of Net Ecosystem Exchange of CO2 and Light Use Efficiency of Winter Wheat to the Change of Clearness Index[J].Science Technology and Engineering,2020,20(27):11018-11024.
冬小麦净碳交换量和光能利用率对晴空指数变化的响应
Response of Net Ecosystem Exchange of CO2 and Light Use Efficiency of Winter Wheat to the Change of Clearness Index
投稿时间:2019-11-18  修订日期:2020-06-23
DOI:
中文关键词:  净碳交换量  光能利用率  晴空指数  冬小麦
英文关键词:net ecosystem exchange of CO2  light use efficiency  clearness index  winter wheat
基金项目:国家自然科学基金青年基金(31400416)和江苏省自然科学基金青年基金(BK20140988)
        
作者单位
杨晓亚 南京信息工程大学应用气象学院
何乾 南京信息工程大学应用气象学院
江晓东 南京信息工程大学应用气象学院
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中文摘要:
      晴空指数(kt)是反映天空晴朗状况的重要指标,能反映到达地面的太阳辐射的变化状况。晴空指数kt的变化将影响植被的光合作用,进而影响生态系统总初级生产力(GPP)的模拟和预测。本研究基于寿县国家气候观测台的通量观测数据和常规气象数据(2008~2009年),分析了冬小麦拔节至乳熟期净碳交换量(NEE)和光能利用率(LUE)对kt的响应。结果表明:冬小麦NEE的绝对值随着kt的增加为先升高后降低的变化趋势,kt的变化可以解释NEE变化的59%。当kt为0.6左右时,即天空有部分云量覆盖的中等辐射条件下,冬小麦农田生态系统的NEE值达到最大。冬小麦LUE随着kt的增加而呈指数下降趋势,不同太阳高度角的拟合方程的决定系数平均值为0.57。随着kt的增加,空气温度和饱和水汽压差表现为增加趋势,这些气象要素的改变共同导致了晴朗天空条件下NEE的降低。
英文摘要:
      Clearness index (kt) is one of the main environmental factors reflecting the clear condition of the sky. It can reflect the variation of solar radiation reaching the ground. The change of kt will affect the photosynthesis of vegetation, and then affect the simulation and prediction of gross primary production (GPP) of ecosystem. This research was based on CO2 flux data and routine meteorology data of Shuoxian National Climate Observatory. The responses of net ecosystem exchange of CO2 (NEE) and light use efficiency (LUE) to kt from jointing to milky maturity of winter wheat in 2008 and 2009 were analyzed. The results showed that the absolute value of NEE for winter wheat increased first and then decreased with the increase of kt. The variation of kt explained 59% of the change for NEE. NEE of winter wheat reached the maximum when kt was about 0.6, which was medium-radiation condition with partial cloud coverage in the sky. LUE of winter wheat showed an exponential decline with the increase of kt. The average determination coefficient of the fitting equation with different solar height angles was 0.57. Air temperature and vapor pressure deficit (VPD) were increased with the increase of kt during the research periods. The decrease of NEE under sunny conditions was caused by the decrease of diffuse radiation and the increase of air temperature and VPD.
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