LPJ-GUESS 3.1 novelties (since 2.1)
                         ==============================

These are the most important functional changes you'll notice when switching
from LPJ-GUESS 2.1 to 3.1. Apart from this, numerous bugfixes, adjustments
and technical improvements have been made. For a full history, refer to the
Subversion history.

* The Nitrogen cycle was added.

* Simulation of BVOC emissions. The model can generate annual and monthly
  isoprene and monoterpene fluxes.

* Diurnal mode. Some of the canopy exchange processes can now run on a sub-
  daily timestep.

* Support for reading climate forcing data from NetCDF files. The NetCDF files
  must conform to the CF metadata standard.

* The new Gridcell class is now the top level structure. A gridcell corresponds
  to a geographic location and may contain one or several stands. Different 
  stands are typically used to simulate different landcover types.

  Only the landcover type for natural vegetation is supported by the standard
  LPJ-GUESS version.

* Instruction files can import other instruction files. This makes it easier
  to maintain ins files for multiple similar setups.

* Functionality for saving the model's current state to file and restarting.

* Code documentation can now be generated with Doxygen.

* Improved benchmarks system with HTML reports.

Since 3.0:

* Grid cell-specific sand, silt and clay fractions. Fractions were derived based on texture classes
  in soil triangle (except for organic soil, where global values from the original soil texture
  scheme, e.g. in v3.0, were kept). A textured_soil switch can be used to revert to original soil
  texture scheme (add the line "textured_soil 0" to your .ins file to use fixed values from Parton 
  et al. (2010)).
  
* Further bugfixes and technical improvements.


Enquiries to Johan.Nord@nateko.lu.se.

Further information available at
http://web.nateko.lu.se/lpj-guess