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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Observation of forest phenology using field-based digital photography and satellite data.
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Observation of forest phenology using field-based digital photography and satellite data.

机译：使用基于野外的数字摄影和卫星数据观察森林物候。

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The present communication reports species-specific phenological events in three tropical dry deciduous forest species and herbaceous plants growing below their canopy. Digital photographs of the tree species - Anogeissus pendula, Lagerstroemia parviflora Roxb. and Acacia catechu were collected regularly using a field-based digital camera between May and September 2010. The photographs were analysed separately on a set of regions of interest representing the tree canopy and herbaceous plants. Green-up onset date (GOD) and date of maximum rate of growth (DMRG) were estimated based on temporal modelling of green fraction (GF) values, which were estimated from time-series digital photographs of the trees and herbaceous plants. DMRG of the herbaceous plants (15 July) was found earlier by a fortnight in comparison to DMRG of the Anogeissus pendula tree canopy (29 July). Rate of growth per day of herbaceous plants was found higher (average rate 0.35% day-1) when compared to the tree species (average rate 0.24% day-1) at DMRG. A significant high correlation (r=0.96) was observed between temporal GF values and Normalized Difference Vegetative Index (NDVI) derived from SPOT-VEGETATION sensor data. Besides, a systematic pattern was observed when daily climatic data were compared with temporal profiles of GF and NDVI data. These results suggest that utilization of field-based digital photographs (time-series data) can provide low-cost, spatially representative and valid information in capturing the foliage growth cycle in a tropical dry deciduous forest ecosystem.
机译：本来文报告了在其冠层以下生长的三种热带干燥落叶林物种和草本植物中特定物种的物候事件。树种的数字照片-Anogeissus pendula，紫薇parxflora Roxb。在2010年5月至9月之间，使用基于野外的数码相机定期收集了刺槐和相思树。这些照片分别在代表树冠和草本植物的一组感兴趣区域上进行了分析。绿化起始日期（GOD）和最大生长速率（DMRG）日期是根据绿色比例（GF）值的时间模型估算的，该值是根据树木和草本植物的时间序列数字照片估算的。相较于Anogeissus pendula树冠的DMRG（7月29日），早两个星期发现了草本植物的DMRG（7月15日）。与树种（平均速率0.24％day -1 ）相比，发现草本植物每天的生长速率更高（平均速率为0.35％day -1 ）。 DMRG。在时间GF值和从SPOT-VEGETATION传感器数据得出的归一化植被指数（NDVI）之间观察到显着的高度相关性（r = 0.96）。此外，将每日气候数据与GF和NDVI数据的时空曲线进行比较时，观察到了系统的模式。这些结果表明，利用基于野外的数码照片（时间序列数据）可以提供低成本，具有空间代表性的有效信息，以捕获热带干燥落叶森林生态系统中的叶子生长周期。

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