title: The influence of precipitation regimes and elevated CO2 on photosynthesis and biomass accumulation and partitioning in seedlings of the rhizomatous perennial grass Leymus chinensis.
abstract: Leymus chinensis is a dominant, rhizomatous perennial C3 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 CO2 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 CO2 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 CO2 and increasing precipitation, but not significantly so when precipitation increased from the normal to high level under CO2 enrichment. Water use efficiency and the ratio of root: total biomass increased significantly when precipitation was low, but decreased when it was high under CO2 enrichment. Moreover, high precipitation at the elevated level of CO2 increased the ratio between stem biomass and total biomass. The effect of elevated CO2 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 CO2 levels, the net photosynthetic rate and biomass of L. chinensis increase with precipitation, but those measures are not further affected by additional precipitation when CO2 is elevated. Furthermore, CO2 may partly compensate for the negative effect of low precipitation on the growth and development of L. chinensis.
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Zhuolin
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Dafu
authors.initials: D
authors.lastname: Yu
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Na
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Saline-alkali Vegetation Ecology Restoration in Oil Field Ministry of Education, Alkali Soil Nature Environmental Science Center, Northeast Forestry University, Harbin, China.
authors.forename: Jixiang
authors.initials: J
authors.lastname: Lin
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Jinwei
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Jiahong
authors.initials: J
authors.lastname: Tang
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wang
authors.affiliation: Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, China.
authors.forename: Chunsheng
authors.initials: C
authors.lastname: Mu
mesh_terms: D018533:Biomass; D002245:Carbon Dioxide / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004780:Environment, Controlled; D018525:Germination / Q000187:drug effects; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000254:growth & development; D006109:Poaceae / Q000187:drug effects / Q000254:growth & development; D011891:Rain; D027343:Rhizome / Q000187:drug effects / Q000254:growth & development; D012621:Seasons; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development*; D014867:Water / Q000494:pharmacology
chemical_list: D014867:Water; D002245:Carbon Dioxide
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