Improvements to a MODIS global terrestrial evapotranspiration algorithm

http://people.forestry.oregonstate.edu/richard-waring/sites/people.forestry.oregonstate.edu.richard-waring/files/publications/Landsberg%20%26%20Waring%201997%20For%20Ecol%20Mgmt.pdf

A generalised model of forest productivity using simplified concepts of radiation-use efficiency, carbon balance and partitioning

Development of a global evapotranspiration algorithm based on MODIS and global meteorology data

Direct and Indirect Estimation of Leaf Area Index, fAPAR, and Net Primary Production of Terrestrial Ecosystems

Considerable progress has been made in our ability to model and measure annual gross primary production (GPP) by terrestrial vegetation. But challenges remain in estimating maintenance respiration (R(m)) and net primary production (NPP). To search for possible common relationships, we assembled annual carbon budgets from six evergreen and one deciduous forest in Oregon, USA, three pine plantations in New South Wales, Australia, a deciduous forest in Massachusetts, USA, and a Nothofagus forest on the South Island of New Zealand. At all 12 sites, a standard procedure was followed to estimate annual NPP of foliage, branches, stems, and roots, the carbon expended in synthesis of these organs (R(g)), their R(m), and that of previously produced foliage and sapwood in boles, branches, and large roots. In the survey, total NPP ranged from 120 to 1660 g C m(-2) year(-1), whereas the calculated fraction allocated to roots varied from 0.22 to 0.63. Comparative analysis indicated that the total NPP/GPP ratio was conservative (0.47 +/- 0.04 SD). This finding supports the possibility of greatly simplifying forest growth models. The constancy of the NPP/GPP ratio also provides an incentive to renew efforts to understand the environmental factors affecting partitioning of NPP above and belowground.

/pdf/net-primary-production-of-forests-a-constant-fraction-of-xvrfzzg3l3.pdf

Net primary production of forests: a constant fraction of gross primary production?

Introduction: Forests in the Modern World. Forest Biomes of the World. Canopy Architecture and Microclimate. Forest Hydrology and Tree-Water Relations. The Carbon Balance of Forests. Soil Organic Matter and Decomposition. Nutrient Distribution and Cycling. Changes in Ecosystem Structure and Function During Stand Development. Ecosystem Process Models. Applications of Modern Technology and Ecophysiology to Forest Management.

J. J. Landsberg

Papers

Applications of physiological ecology to forest management