Bioclimate.org: Dryland systems

Authors	Safriel U. , Adeel Z. , Niemeijer D. , PuigdefÂbrega J. , White R. , Lal R. , Winslow M. , Ziedler J. , Prince S. , Archer E. , King C. , Shapiro B. , Wessels K.J. , Nielsen T. , Portnov B. , Reshef I. , Thonell J. , Lachman E. , Mcnab D.
Source	Island Press (4)
Type	C - Chapter (105)
Peer Review	2 - Medium (2288)
Audience	S - Specialist (3514)
Pages	623-662
Notes	Drylands cover about 41% of Earth’s land surface and are inhabited by more than 2 billion people (about one third of world population). Drylands are limited by soil moisture, the result of low rainfall and high evaporation, and show a gradient of increasing primary productivity, ranging from hyper-arid, arid, and semiarid to dry subhumid areas. Deserts, grasslands, and woodlands are the natural expression of this gradient.