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Experimental attenuation of specific regions of the solar spectrum demonstrates that both UV and visible radiation can drive photodegradation in the field. (A) Mass loss of grass litter in a semiarid grassland. Initial lignin concentration of litter was 7.3%. (B) Mass loss of cellulose-lignin (CL) substrates with 10% lignin concentration. Bars denote treatment means (n = 5 + SEM). Different letters indicate significant differences for Tukey HSD posthoc comparisons.
