Elevated CO2 effects on nutrient competition between a C3 crop (Oryza sativa L.) and a C4 weed (Echinochloa crusgalli L.)
作者： Qing Zeng , Biao Liu , Ben Gilna , Yali Zhang , Chunwu Zhu
DOI: 10.1007/S10705-010-9379-Z
关键词:
摘要: Rice (a C3 crop) and barnyard grass (Echinochloa crusgalli L.) C4 weed) were grown in a 1:1 mixture paddy field ambient condition with supplemented free air carbon dioxide enrichment (FACE, CO2 concentration + 200 μmol mol−1), order to evaluate the impact of rising atmospheric on nutrient competition between rice crop weed. Results showed that elevated significantly enhanced biomass, tillers, leaf area index (LAI) net assimilation rate (NAR) rice, but reduced those after elongation. Tissue nitrogen (N) concentrations decreased both competitors, their phosphorus (P) potassium (K) concentration increased. The increase tissue P was greater than grass. Furthermore, absolute uptake C, N, P, K by increased while decreased. As result, significant ratios rice/barnyard biomass observed under CO2. results suggest could alter fields favor rice. ability compete more successfully for phosphorous is likely an important factor underlying this response. More generally, may have varying implications dynamics different elements overall plant soil nutrients pool.
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