Zangerl A R, Bazzaz F A
Department of Plant Biology, University of Illinois, 61801, Urbana, IL, USA.
Oecologia. 1984 Jun;62(3):412-417. doi: 10.1007/BF00384276.
Communities, consisting of six co-occurring, disturbed site annuals, were subjected to CO unenriched (300 ppm) and to CO enriched (450 and 600 ppm) atmospheres at different levels of light and nutrient availability. In general, total community production increased with CO enrichment to 450 ppm, but a further increase in CO to 600 ppm had little or no effect. The response of community production to CO level was not affected by nutrient availability but was affected by light level.Of the six species, four display C metabolism. The proportion of total community production contributed by these species increased as a result of CO enrichment, and was dependent upon both light and nutrient availability. The relative success of some species, particularly in terms of reproduction (total seed biomass), was significantly altered by CO concentration depending on the level of nutrients. There were not only changes in reproductive success (seed biomass) and shoot biomass but also changes in the proportion of biomass allocated to seed.These experiments demonstrate that CO enrichment does affect annual plant communities both in terms of productivity and species composition and that the affect of CO on such system may depend upon other resources such as light and nutrients.
由六种同时出现的受干扰场地一年生植物组成的群落，在不同光照和养分可利用水平下，分别暴露于未富集CO（300 ppm）以及富集CO（450 ppm和600 ppm）的大气环境中。总体而言，群落总生产力随着CO浓度升高至450 ppm而增加，但CO浓度进一步升高至600 ppm时，影响很小或几乎没有影响。群落生产力对CO水平的响应不受养分可利用性的影响，但受光照水平的影响。在这六个物种中，有四个表现出C代谢。这些物种对群落总生产力的贡献比例因CO富集而增加，并且取决于光照和养分可利用性。某些物种的相对优势，特别是在繁殖方面（种子总生物量），根据养分水平的不同，会因CO浓度而发生显著变化。不仅繁殖成功率（种子生物量）和地上生物量发生了变化，而且分配到种子的生物量比例也发生了变化。这些实验表明，CO富集确实会在生产力和物种组成方面影响一年生植物群落，并且CO对这类系统的影响可能取决于其他资源，如光照和养分。
