Root carbon consumption and grain yield of spring wheat in response to phosphorus supply under two water regimes

作     者：GUAN Yu QIAO Zhen DU Jiu-yuan DU Yan-lei 

作者机构：Department of Resource and Environmental Science Agronomy College Shihezi University State Key Laboratory of Grassland Agro-ecosystem Institute of Arid Agroecology School of Life Sciences Lanzhou University Institute of Wheat Gansu Academy of Agricultural Sciences 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2016年第15卷第7期

页      面：1595-1601页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by the National Nature Science Foundation of China (31300328, 31200335, 31470496) the "111" Program from State Administration of Foreign Experts Affairs (SAFEA) & Ministry of Education (MOE), China (2007B051) the Fundamental Research Funds for the Central Universities, China (lzujbky-2012-97, lzujbky-2015-ct02, lzujbky-2016-86) the funding from the State Key Laboratory of Grassland Agro-ecosystem in Lanzhou University, China 

主　　题：grain yield phosphorus supply rootcarbon consumption spring wheat water supply 

摘      要：In semiarid areas, cereal crops often alocate more biomass to root at the expense of aboveground yield. A pot experiment was conducted to investigate carbon consumption of roots and its impact on grain yield of spring wheat （Triticum aestivum L.） as affected by water and phosphorus （P） supply. A factorial design was used with six treatments namely two water regimes （at 80–75% and 50–45% ifeld capacity （FC）） and three P supply rates （P1=0, P2=44 and P3=109 μg P g–1 soil）. At shooting and lfowering stages, root respiration and carbon consumption increased with the elevate of P supply rates, regardless of water conditions, which achieved the minimum and maximum at P1 under 50–45% FC and P3 under 80–75% FC, respectively. However, total aboveground biomass and grain yield were higher at P2 under 80–75% FC; and decreased with high P application （P3）. The results indicated that rational or low P supply （80–75% of ifeld water capacity and 44 mg P kg–1 soil） should be recommended to improve grain yield by decreasing root carbon consumption in semiarid areas.