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Response of 12 weedy species to elevated CO 2 in low‐phosphorus‐availability soil
Author(s) -
Tang Jianjun,
Chen Jing,
Chen Xin
Publication year - 2006
Publication title -
ecological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.628
H-Index - 68
eISSN - 1440-1703
pISSN - 0912-3814
DOI - 10.1007/s11284-006-0161-2
Subject(s) - biology , eleusine indica , lolium perenne , botany , poa annua , forb , agronomy , weed , perennial plant , grassland
We conducted an experiment on responses of weedy species from an orchard ecosystem to elevated CO 2 (700–800 μmol mol −1 ) under low phosphorus (P) soil in an environment‐controlled growth chamber. Twelve local weedy species, Poa annua L., Lolium perenne L., Avena fatua L., Vicia cracca L., Medicago lupulina L., Kummerowia striata (Thunb.) Schindl., Veronica didyma Ten., Plantago virginica L., Gnaphalium affine D.Don., Echinochloa crusgalli var. mitis (L.) Beauv., Eleusine indica (L.) Gaertn. and Setaria glauca (L.) P. Beauv., grouped into four functional groups (C 3 grass, C 3 forb, legume and C 4 grass), were used in the experiment. The total plant biomass, P uptake, and mycorrhizal colonization were measured. The results showed that the total biomass of the 12 weedy species tended to increase under elevated CO 2 . But changes in the total biomass under elevated CO 2 significantly differed among functional groups: legumes showed the greatest increase in the total biomass of all functional groups, following the order C 3 forbs > C 4 grasses > C 3 grasses. Elevated CO 2 significantly increased mycorrhizal colonization and P uptake of legumes, C 3 forbs and C 4 grasses but did not change C 3 grasses. Positive correlations between mycorrhizal colonization and shoot P concentration, and between total P uptake and total biomass were found under elevated CO 2 . The results suggested that the interspecific difference in CO 2 response at low P availability was caused by the difference in CO 2 response in mycorrhizae and P uptake. These differences among species imply that plant interaction in orchard ecosystems may change under future CO 2 enrichment.