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20 0 1、2 0 0 2年利用我国惟一的农田开放式空气CO2 浓度增高 (FACE)系统平台 ,研究不同施N量条件下 ,对武香粳 14不同生育时期N素含量、N素吸收、N素分配和N素效率的影响。结果表明 :(1)除移栽后 16d ,FACE使其他生育期稻株含N率显著或极显著下降 ,生育中期的降幅大于生育前、后期 ;(2 )FACE使水稻不同生育期N素吸收量增加 ,生育前期的增幅明显大于生育中、后期 ;(3)FACE使茎鞘 (生育前、中期 )或稻穗 (生育后期 )的N素积累能力相对增强 ,使叶片的N素积累能力相对减弱 ;(4)除移栽后 16d ,FACE使其他生育期水稻N素物质生产效率显著或极显著增加 ,使水稻N素籽粒生产效率和收获指数增加 ;(5 )增施N肥 ,使水稻生育中、后期植株N素含量和吸收量增加 ,使N素效率下降 ,而对N素在各器官中的分配影响较小 ;(6 )FACE和N处理对水稻N素营养的互作效应较小。
20 0 1,2 0 0 2 years using the only open field CO 2 enrichment in farmland (FACE) system platform to study the N application rate under different conditions, Wu Xiang 14 at different growth stages of N content, N uptake, N prime distribution and N efficiency. The results showed that: (1) FACE significantly or significantly reduced the N content of rice plants at other growth stages except for 16 days after transplanting, and the decline rate in mid-growth stage was greater than that before and after growth; (2) FACE increased the N uptake of rice at different growth stages (3) FACE increased relative N accumulation capacity in stem and sheath (before and after birth) or in rice (late growth period), and thus relative N accumulation capacity of leaves (4) In addition to 16 days after transplanting, FACE increased significantly or significantly the N production efficiency of rice at other growth stages, and increased N production efficiency and harvest index of rice; (5) The increase of N content and uptake of plant during the middle and late growth period decreased the efficiency of N, but had less effect on the distribution of N in various organs. (6) Compared with the N and N treatments, small.