...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nutrient Cycling in Agroecosystems >Elevated CO2 effects on nutrient competition between a C-3 crop (Oryza sativa L.) and a C-4 weed (Echinochloa crusgalli L.)
【24h】

Elevated CO2 effects on nutrient competition between a C-3 crop (Oryza sativa L.) and a C-4 weed (Echinochloa crusgalli L.)

机译：二氧化碳对C-3作物（Oryza sativa L.）和C-4杂草（Echinochloa crusgalli L.）之间养分竞争的影响增强

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Rice (a C-3 crop) and barnyard grass (Echinochloa crusgalli L.) (a C-4 weed) were grown in a 1:1 mixture in a paddy field in ambient condition and with supplemented free air carbon dioxide enrichment (FACE, CO2 concentration + 200 mu mol mol(-1)), in order to evaluate the impact of rising atmospheric carbon dioxide on nutrient competition between rice crop and weed. Results showed that elevated CO2 significantly enhanced the biomass, tillers, leaf area index (LAI) and net assimilation rate (NAR) of rice, but reduced those of barnyard grass after elongation. Tissue nitrogen (N) concentrations were decreased in both competitors, but their phosphorus (P) and potassium (K) concentration were increased. The increase in tissue P concentration of rice was greater than that in barnyard grass. Furthermore, the absolute uptake of C, N, P, K by rice were increased while those of barnyard grass decreased. As a result, significant increase of the ratios of rice/barnyard grass of biomass and absolute nutrient uptake were observed under elevated CO2. The results suggest that rising atmospheric CO2 concentration could alter the competition between rice and barnyard grass in paddy fields in favor of rice. The ability of rice to compete more successfully for nitrogen and phosphorous under elevated CO2 is likely an important factor underlying this response. More generally, the results suggest that elevated CO2 may have varying implications on nutrient dynamics between different elements of overall plant biomass and the soil nutrients pool.
机译：在环境条件下，稻米（C-3作物）和bar草（Echinochloa crusgalli L。）（C-4杂草）以1：1的混合物种植在稻田中，并补充有补充的空气中二氧化碳（FACE， CO2浓度+ 200μmol mol（-1）），以评估大气中二氧化碳含量升高对稻作物和杂草之间养分竞争的影响。结果表明，升高的CO 2显着提高了水稻的生物量，分till，叶面积指数（LAI）和净同化率（NAR），但降低了n后伸长的n草。两种竞争者的组织氮（N）浓度均降低，但其磷（P）和钾（K）浓度却增加。水稻组织中磷的增加幅度大于bar草中的。此外，水稻对C，N，P，K的绝对摄取量增加，而grass草的绝对摄取量减少。结果，在二氧化碳升高的情况下，水稻/ bar草的生物量比率和绝对养分吸收率显着增加。结果表明，大气中CO2浓度升高可能会改变水稻与稻田中n草之间的竞争，从而有利于水稻。在二氧化碳升高的情况下，水稻更成功地竞争氮和磷的能力可能是该反应的重要因素。更一般而言，结果表明，升高的CO2可能对植物总生物量的不同元素与土壤养分库之间的养分动态产生不同的影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号