منابع مشابه
Use of digital cameras for phenological observations
a r t i c l e i n f o Keywords: Digital camera Vegetation phenology RGB Green excess index Green-up date Temperature sensitivity Japan Vegetation phenology such as the onset of green-up and senescence is strongly controlled by climate and other environmental factors, and in turn affects the terrestrial carbon balance. Therefore, phenological observation is important as an indicator of global wa...
متن کاملReview: advances in in situ and satellite phenological observations in Japan.
To accurately evaluate the responses of spatial and temporal variation of ecosystem functioning (evapotranspiration and photosynthesis) and services (regulating and cultural services) to the rapid changes caused by global warming, we depend on long-term, continuous, near-surface, and satellite remote sensing of phenology over wide areas. Here, we review such phenological studies in Japan and di...
متن کاملUSA National Phenology Network’s volunteer-contributed observations yield predictive models of phenological transitions
PURPOSE In support of science and society, the USA National Phenology Network (USA-NPN) maintains a rapidly growing, continental-scale, species-rich dataset of plant and animal phenology observations that with over 10 million records is the largest such database in the United States. The aim of this study was to explore the potential that exists in the broad and rich volunteer-collected dataset...
متن کاملModel-data assimilation of multiple phenological observations to constrain and predict leaf area index.
Our limited ability to accurately simulate leaf phenology is a leading source of uncertainty in models of ecosystem carbon cycling. We evaluate if continuously updating canopy state variables with observations is beneficial for predicting phenological events. We employed ensemble adjustment Kalman filter (EAKF) to update predictions of leaf area index (LAI) and leaf extension using tower-based ...
متن کاملPhenological Changes in the Southern Hemisphere
Current evidence of phenological responses to recent climate change is substantially biased towards northern hemisphere temperate regions. Given regional differences in climate change, shifts in phenology will not be uniform across the globe, and conclusions drawn from temperate systems in the northern hemisphere might not be applicable to other regions on the planet. We conduct the largest met...
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ژورنال
عنوان ژورنال: The American Naturalist
سال: 1900
ISSN: 0003-0147,1537-5323
DOI: 10.1086/277670