Crested wheatgrass-cheatgrass seedling competition in a mixed-density design

作者: Mark G. Francis , David A. Pyke

DOI: 10.2307/4002925

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摘要: Plant competition experiments have historically used designs that are difficult to interpret due confounding problems. Recently, based on a "response function" approach been proposed and tested in various plant mixture settings. For this study, 3 species were important current revegetation practices the Intermountain West. 'Nordan' ('Agropyron desertorum [Fish. ex Link] Shult.) 'Hycrest' (A. cristatum [L.] Gaertn. X desertorum) crested wheatgrass commonly-used rangelands susceptible cheatgrass (Bromus tectorum L.) invasion, although little quantitative data exist compare their competitive abilities. We evaluated ability of Hycrest Nordan seedlings 2-species mixtures with greenhouse study. Linear nonlinear models developed for range densities (130-520 seeds m-2) each predict median above-ground biomass tiller numbers further test usefulness design evaluating rehabilitate rangelands. In both experiments, increasing reduced own production while production. did not affect However, production, its The index i.e. substitution rate, indicated better competitors than Nordan, all mixtures, plants superior competitors. Further field research using design, where environmental inputs less optimal diverse, is needed validate these results evaluate use examining effects intra- interspecific competition.

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