The Influence of Precipitation Regimes and Elevated CO(2) on Photosynthesis and Biomass Accumulation and Partitioning in Seedlings of the Rhizomatous Perennial Grass Leymus chinensis

Leymus chinensis is a dominant, rhizomatous perennial C(3) species in the grasslands of Songnen Plain of Northern China, and its productivity has decreased year by year. To determine how productivity of this species responds to different precipitation regimes, elevated CO(2) and their interaction in future, we measured photosynthetic parameters, along with the accumulation and partitioning of biomass. Plants were subjected to combinations of three precipitation gradients (normal precipitation, versus normal ± 40%) and two CO(2) levels (380±20 µmol mol(-1),760±20 µmol mol(-1)) in controlled-environment chambers. The net photosynthetic rate, and above-ground and total biomass increased due to both elevated CO(2) and increasing precipitation, but not significantly so when precipitation increased from the normal to high level under CO(2) enrichment. Water use efficiency and the ratio of root: total biomass increased significantly when precipitation was low, but decreased when it was high under CO(2) enrichment. Moreover, high precipitation at the elevated level of CO(2) increased the ratio between stem biomass and total biomass. The effect of elevated CO(2) on photosynthesis and biomass accumulation was higher at the low level of precipitation than with normal or high precipitation. The results suggest that at ambient CO(2) levels, the net photosynthetic rate and biomass of L. chinensis increase with precipitation, but those measures are not further affected by additional precipitation when CO(2) is elevated. Furthermore, CO(2) may partly compensate for the negative effect of low precipitation on the growth and development of L. chinensis.