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Understanding how ecosystem carbon (C) and nitrogen (N) cycles respond tothe variability of precipitation can help us assess the effects of globalclimate change on terrestrial ecosystem structure and function. Weinvestigated the contributions of aboveground biomass, litter, root, soiland microbial communities to ecosystem C and N processes at 14 sites along a1000 km precipitation gradient in native <i>Leymus chinensis</i> grasslands of northeastern China.The results show that aboveground biomass C and N increased gradually, whileno significant regional trends in litter and root biomass were found withincreasing mean annual precipitation (MAP) along the gradient. Soilrespiration increased first and then decreased from the dry to mesic sites,which could be ascribed to the relative changes in temperature, soilfungal : bacterial biomass and N availability. Surprisingly, N mineralization variedonly slightly along the gradient, likely due to the decreases of soilorganic matter quality (i.e., C : N). Stepwise regression models indicatedregional soil C and N content positively correlated with MAP and claycontent. Overall, C and N sequestration increased 3.2- and 1.8-fold withincreasing MAP in terms of C and N storage in aboveground biomass, roots,litter and soil. It was concluded from the current study that regionalprecipitation variability strongly influences ecosystem C and N dynamics.The ecosystem C and N sequestration are primarily modulated by annualprecipitation and soil texture, while the C and N turnover are largelycontrolled by microbial community composition, temperature and soil qualityin <i>L. chinensis</i> grasslands across the large-scale precipitation gradient

biogeosciences

Carbon and nitrogen dynamics of native &amp;lt;i&amp;gt;Leymus chinensis&amp;lt;/i&amp;gt; grasslands along a 1000 km longitudinal precipitation gradient in northeastern China