期刊
GLOBAL CHANGE BIOLOGY
卷 22, 期 2, 页码 792-805出版社
WILEY
DOI: 10.1111/gcb.13122
关键词
deciduous forest; MODIS; phenology models; species composition; spring phenology
资金
- NASA [NNX11AE75G, NNX14AJ35G]
- National Science Foundation through the LTER program [DEB-1237491]
- National Science Foundation through Macrosystems Biology program [EF-1065029]
- Department of Energy through the Regional and Global Climate Modeling program [DE-SC0016011]
- Northeastern States Research Cooperative, NSF's Macrosystems Biology Program [EF-1065029]
- US National Park Service Inventory and Monitoring Program
- USA National Phenology Network from the United States Geological Survey [G10AP00129]
- NASA [NNX11AE75G, NNX14AJ35G, 681143, 147139] Funding Source: Federal RePORTER
- Direct For Biological Sciences
- Emerging Frontiers [1065029, GRANTS:13801675] Funding Source: National Science Foundation
- Division Of Environmental Biology
- Direct For Biological Sciences [1633026] Funding Source: National Science Foundation
- Emerging Frontiers
- Direct For Biological Sciences [1064614] Funding Source: National Science Foundation
Phenological events, such as bud burst, are strongly linked to ecosystem processes in temperate deciduous forests. However, the exact nature and magnitude of how seasonal and interannual variation in air temperatures influence phenology is poorly understood, and model-based phenology representations fail to capture local- to regional-scale variability arising from differences in species composition. In this paper, we use a combination of surface meteorological data, species composition maps, remote sensing, and ground-based observations to estimate models that better represent how community-level species composition affects the phenological response of deciduous broadleaf forests to climate forcing at spatial scales that are typically used in ecosystem models. Using time series of canopy greenness from repeat digital photography, citizen science data from the USA National Phenology Network, and satellite remote sensing-based observations of phenology, we estimated and tested models that predict the timing of spring leaf emergence across five different deciduous broadleaf forest types in the eastern United States. Specifically, we evaluated two different approaches: (i) using species-specific models in combination with species composition information to upscale' model predictions and (ii) using repeat digital photography of forest canopies that observe and integrate the phenological behavior of multiple representative species at each camera site to calibrate a single model for all deciduous broadleaf forests. Our results demonstrate variability in cumulative forcing requirements and photoperiod cues across species and forest types, and show how community composition influences phenological dynamics over large areas. At the same time, the response of different species to spatial and interannual variation in weather is, under the current climate regime, sufficiently similar that the generic deciduous forest model based on repeat digital photography performed comparably to the upscaled species-specific models. More generally, results from this analysis demonstrate how insitu observation networks and remote sensing data can be used to synergistically calibrate and assess regional parameterizations of phenology in models.
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