Project Number: 6206-11220-005-11
Start Date: Oct 01, 2012
End Date: Aug 31, 2015
We will use high spatial resolution (0.5-5 m) multispectral imagery to evaluate mortality of adult trees during the period from 2008 to 2014. High resolution images are available from the USDA for pre-drought (2008) analysis. Satellite imagery will be acquired for post-drought analysis (2012-2014). Mortality and loss of live crown area will be validated by field inspection. We will measure vulnerability to hydraulic failure in roots and stems, transpiration, plant water status, and net photosynthesis and respiration for six dominant tree species. A soil–vegetation–atmosphere carbon and water transfer model will be used to evaluate whether mortality under drought results from hydraulic failure or inadequate carbon. The model will be applied to predict future patterns of water use, carbon exchange, and tree mortality.