Absorption of Photosynthetically Active Radiation, Radiation Use Efficiency and Spectral Reflectance of Bracken [Pteridium aquilinum (L.) Kuhn] Canopies
Absorption of Photosynthetically Active Radiation, Radiation Use Efficiency and Spectral Reflectance of Bracken [Pteridium aquilinum (L.) Kuhn] Canopies
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蕨菜冠层光合有效辐射吸收、辐射利用效率及光谱反射率
DOI：
10.1006/anbo.1999.1096
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发表时间：
2000
期刊：
影响因子：
4.2
通讯作者：
J. Pitman
中科院分区：
文献类型：
--
作者：
J. Pitman
从1980年到1992年，用7年的时间测量了蕨类冠层的季节发育。研究的目的是将绿色地上生物量的累积发展与累积吸收的光合作用有效辐射(APAR)联系起来。在营养生长期，APAR符合经验公式(Monski和Saeki，Japan Journal of Botany14：22-32,1953)，其冠层消光系数为0.6。地上生物量与累积APAR值呈线性关系，平均辐射利用效率(RUE)为2.77gMJ−1，但年际间存在差异。对于地上碳生物量，平均RUE为1.24g C MJ−1。吸收PARfAPAR的比例与简单的光谱反射率RVI呈非线性关系，并可由其预测，关系式为fAPAR=0.0472(±0.0017)RVI。无论是从卫星校正数据还是从田间光谱，遥感营养生长期的RVI，并将其转换为APAR，将使我们能够利用这里发现的RUE直接和非破坏性地估计蕨类生物量。
The seasonal development of a bracken canopy was measured over 7 years between 1980 and 1992. The object of the investigation was to relate the cumulative development of green above-ground biomass to cumulative absorbed photosynthetically active radiation (APAR). During the vegetative phase, APARwas described by an empirical expression (Monski and Saeki, Japanese Journal of Botany14: 22–32, 1953) relating APARto frond area, with a canopy extinction coefficient of 0.6. Values of above-ground biomass were linearly related to cumulative APAR, and the averaged radiation use efficiency (RUE) was 2.77 g MJ − 1, although there was variation from year to year. For above-ground carbon biomass, the average RUE was found to be 1.24 g C MJ − 1. The fraction of absorbed PARfAPAR was also shown to be non-linearly related to, and predictable from, a simple spectral reflectance ratio, RVI, by the relationship fAPAR = 0.0472 (±0.0017)RVI. Remote sensing RVI during the period of vegetative growth, either from satellite corrected data or from field spectroscopy, and its conversion toAPAR , will enable bracken biomass to be estimated directly and non-destructively using the RUE found here.