The utility of MODIS-sPRI for investigating the photosynthetic light-use efficiency in a Mediterranean deciduous forest

The utility of MODIS-sPRI for investigating the photosynthetic light-use efficiency in a Mediterranean deciduous forest
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MODIS-sPRI 用于调查地中海落叶林光合光利用效率的实用性

DOI:
10.1080/01431161.2014.950762
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发表时间:
2014
影响因子:
3.4
通讯作者:
Guarini R
Guarini R
中科院分区:
工程技术3区
文献类型:
--
作者:
Guarini R

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本研究探讨了中分辨率成像光谱仪(MODIS)的实用程序派生的sPRI(定标光化学反射指数)和光合光利用效率(LUE)计算涡度协方差塔数据的关系。分析进行了连续两年(2003 - 2004年)在MediterraneanQuercus cerrisL。位于意大利的森林遗址。在研究期间,温度和降雨条件差异很大,2003年是一个明显的干旱年,2004年是一个非干旱年。中分辨率成像分光仪海洋波段11(以531 nm为中心)和12(以551 nm为中心)用于计算sPRI。LUE在2003年和2004年表现出很大的变化,和温和的MODIS-sPRI和LUE之间的关系,观察在潮湿的一年,并为后向散射场景。这证明了sPRI在强光条件下检测植物对叶黄素循环激活的能力。然而,我们的研究结果表明,sPRI应小心使用,特别是在严重的水分胁迫条件下,当观察到的混杂因素,如冠层结构,光照和视角的影响增加。
The present study investigated the utility of Moderate Resolution Imaging Spectroradiometer (MODIS)-derived sPRI (scaled photochemical reflectance index) and its relationship to photosynthetic light-use efficiency (LUE) calculated from eddy covariance tower data. The analysis was performed over two consecutive years (2003–2004) in a MediterraneanQuercus cerrisL. forest site in Italy. Temperature and rainfall conditions differed markedly over the study period, with 2003 being a notable drought year and 2004 a non-drought year. MODIS ocean bands 11 (centred at 531 nm) and 12 (centred at 551 nm) were used for calculating sPRI. LUE exhibited substantial variability within 2003 and 2004, and a moderate relationship between MODIS-sPRI and LUE was observed during the wet year, and for backscattering scenes. This demonstrated the capacity of sPRI to detect xanthophyll cycle activation by vegetation during high light conditions. However, our results show that sPRI should be used with care, particularly under severe water stress conditions, when an increased influence of confounding factors, such canopy structure, illumination, and viewing angles, is observed.
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