NFDRS CLIMATE CLASS 



1 m 



20 



Figure 2.— Map of the United States showing the general locations of the WDRS climate 



classes {Deeming and others 2977). 



Different linear drying rates are defined by climate class for annuals, perenni- 

 als, and woody plants. But within a particular climate class, a single drying rate is 

 assumed for live woody plants throughout a growing season. For live herbaceous plants, 

 drying occurs in two stages--green stage when the herbaceous moisture is above 120 

 percent, and transition stage for moistures between 120 percent and 30 percent. In the 

 green stage, both annuals and perennials dry at the same rate. But in the transition 

 stage, the drying rate is faster for annuals than for perennials. 



5 



