Utilization of ground-based digital photography for the evaluation of seasonal changes in the aboveground green biomass and foliage phenology in a grassland ecosystem
Utilization of ground-based digital photography for the evaluation of seasonal changes in the aboveground green biomass and foliage phenology in a grassland ecosystem
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DOI：
10.1016/j.ecoinf.2014.09.013
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发表时间：
2015-01-01
影响因子：
5.1
通讯作者：
Koizumi, Hiroshi
中科院分区：
文献类型：
--
作者：
Inoue, Tomoharu;Nagai, Shin;Koizumi, Hiroshi
我们调查了一个基于地面的数码摄影的实用性，以评估在日本的短草草原地上绿色生物量和树叶物候的季节性变化。为了地面实况的目的，还每月测量地上绿色生物量和地上植物部分的光谱反射率的生态变量。基于相机的指数（rG：绿色通道的比率）的季节变化反映了叶片物候的特征事件，如叶片冲洗和叶片衰老。此外，rG的季节模式是类似的地上绿色生物量的全年。此外，rG和地上绿色生物量之间存在正线性关系（R-2 = 0.81，p < 0.05），与基于光谱的植被指数的情况相同。在这些结果的基础上，我们得出结论，连续观察使用数码相机是一个有用的工具，是劳动密集型比传统的方法估计地上绿色生物量和监测叶片物候在短草草原在日本。(C)© 2014 Elsevier B. V.保留所有权利。
We investigated the usefulness of a ground-based digital photography to evaluate seasonal changes in the aboveground green biomass and foliage phenology in a short-grass grassland in Japan. For ground-truthing purposes, the ecological variables of aboveground green biomass and spectral reflectance of aboveground plant parts were also measured monthly. Seasonal change in a camera-based index (rG: ratio of green channel) reflected the characteristic events of the foliage phenology such as the leaf-flush and leaf senescence. In addition, the seasonal pattern of the rG was similar to that of the aboveground green biomass throughout the year. Moreover, there was a positive linear relationship between rG and aboveground green biomass (R-2 = 0.81, p < 0.05), as was the case with spectra-based vegetation indices. On the basis of these results, we conclude that continuous observation using digital cameras is a useful tool that is less labor intensive than conventional methods for estimating aboveground green biomass and monitoring foliage phenology in short-grass grasslands in Japan. (C) 2014 Elsevier B.V. All rights reserved.