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Biomass components of mesquite (Prosopijr@&wa(Swartx)DC) and palo Verde (Cerci&m floridum (Ben&)) soil-plant systems were collected during spring, winter, and fall for 3 years to study the temporal distribution of the mass of understory vegetation and litter and the dynamics of nitrogen and carbon in all biomass components. Mass of palo Verde litter changed seasonally while that of mesquite did not change. With exception of mesquite litter, mass of understory vegetation and litter did not change annually for either shrub. Seasonal and annual changes were observed in both N and C of selected shrub, understory, and litter components, but these changes were more prevalent in mesquite than palo Verde. Seasonal changes appeared primarily related to N and C demand in regions of rapid growth. Annual changes appear related to weather phenomena which regulate decomposition, uptake, and growth. Understory vegetation was dominated by Arizona cottontop Digitaria californica (Benth.) Chase, needle grama (Bouteloua aristidoides H.B.K.), bush muhly (Muhlenbergia porteri Scribn.) and burroweed Aplopappus tenuisectus (Green) Blake. Sampling was restricted to upland sites and to the Sonoita soil series. This soil is derived from recent mixed alluvial deposits and is a loamy, mixed thermic Typic Haplargid. For the previous 50 years, the site had been lightly and uniformly grazed; disturbance from other causes was not visible.

Seasonal and Annual Changes in Biomass Nitrogen and Carbon of Mesquite and Palo Verde Ecosystems