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Biocrusts play an important role in carbon (C) assimilation in arid and semiarid regions. In order to assess C gain in the crusted Hallamish dune field, net photosynthesis (Pn) and respiration (R) were measured at five crust types (A–E) which show a gradual increase in their chlorophyll content (with A<B<C<D<E). Pn and R were calculated per chlorophyll a and b (hereafter a/b) content....
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