酸性黄棕壤中钼磷配施对甘蓝型油菜苗期碳氮代谢的影响

利用酸性黄棕壤进行盆栽试验，研究了钼磷配施对甘蓝型油菜苗期碳氮代谢的影响。结果表明，施钼和施磷均显著增加叶片叶绿素含量、光合速率、可溶性总糖含量以及地上部干物质重和可溶性蛋白质含量，显著降低油菜苗期叶片硝态氮含量；且钼肥和磷肥配施对促进油菜苗期碳氮代谢存在协同效应。钼肥和磷肥提高油菜光合速率的机制有所不同，钼肥主要提高叶肉细胞光合活性，而磷肥则增加气孔导度。

Effects of molybdenum and phosphorus fertilizers on photosynthetic carbon and nitrogen metabolism of Brassica napus seedlings in acid yellow-brown soil

A pot experiment using acid yellow-brown soil was conducted to investigate the interactive effects of molybdenum(Mo) and phosphorus(P) fertilizers on carbon and nitrogen metabolism of Brassica napus seedlings.The results indicated that both Mo and P fertilizers application increased chlorophyll,soluble sugar and soluble protein concentrations,net photosynthesis rate of seedling leaves and dry matter weight(DM) of shoots,but decreased NO3——N contents of seedling leaves.There was synergetic effects on photosynthetic carbon and nitrogen metabolism of Brassica napus seedlings between Mo and P fertilizers.Mo and P fertilizers increased photosynthetic rate through two different mechanisms: Mo increased photosynthetic activity of mesophyll cells and P increased stomatal conductance.