摘要:
杂交稻产量8～10t的群体作物生长率(CGR)15.4～18.2g/(m2·d),其中苞分化至齐穗期19～28g/(m2·d);孕穗至齐穗期LAI6.5～7.5,且冠层叶片直立,阳光可透入群体深层,底叶光强为光补偿点的2～3倍;本田期平均净同化率(NAR)3.4～4.4g/(m2·d),太阳总辐射量为137～150kJ/cm2,平均日辐射(S)1445～1456J/(cm2·d);光能利用率(Eu)1.67%～1.96%,其中苞分化至齐穗期2.15%～2.70%,短期最高实测值达3.75%.在几个光合生产因素中,前期以LAT和S对CGR的贡献最大,中后期以NAR和Eu对CGR的贡献最大,但后期S与CGR及NAR也呈极显著正相关.
Abstract:
The colony growth rate(CGR)of hybrid rice at the yield level of 8～10 t/hm2 was 15.4～18.2 g/(m2·d), while from primary panicle emerging stage to heading stage was 19～28 g/(m2 d). The leaf area index(LAT)of the colony between booting to heading stage was 6.5～7.5,and the leaves in top layer were erect. Thus the sunlight was able to cast onto the deep part of the colony, the light intensity on leaves in the botom of colony was 2～3 times of the light compensa-tion point The averge net assimilation rate(NAR)during field growing period was 3.4～4.4 g/(m2· d); the total energy of solar radiation was 137～150 kJ/cm2 with the daily solar radiation(S)of 1445～1456 J/(cm2·d). The light-energy utilizing rate(EU)of the colony during field growing period was 1.67%～1.96%, While from primary panicle emerging stage to heading stage was 2.15%～2.70% with the highest of 3.75% in a short time. Path analysis showed that, before panicle initiation, LAI and S contributed more to CGR, and NAR and EU contributed rnore to CGK after the panicle initiation, However, S appeared a very significant position correlated to CGR and NAR after heading stage.
点击查看大图
下载:
