带型及施氮对玉米间作豌豆光能利用率的影响

通过大田试验,研究了施氮及带型对绿洲灌区单作和间作玉米、豌豆产量、光能利用率及光合源大小的影响,旨在为该区玉米间作豌豆的增产增效提供理论依据。结果表明:试验设计的各间作处理的土地当量比(LER)都大于1,说明玉米间作豌豆可提高土地利用效率;与2:4模式(2行玉米、4行豌豆)相比,3:4模式(3行玉米、4行豌豆)的LER增大了28.26%,说明3:4模式具有较好的提高土地利用率的作用。单作玉米、单作豌豆、2:4间作、3:4间作的三个氮水平下的平均光能利用率分别为0.60%、0.15%、0.53%和0.60%,氮肥减量15%的3:4间作的光能利用率最高,达到了0.75%。3:4模式的平均叶面积指数(LAI)比2:4模式高22.83%-28.27%,叶日积(LAD)高25.49%-27.83%。在本试验设计的参数范围内,随LAD的增大,作物的光能利用率持续增大,因此进一步提高LAD是提高光能利用率、增加产量的有效途径。

Response of Solar Radiation Use Efficiency on Nitrogen Application Rates and Percentage of Intercropped Maize and Pea

A field experiment was conducted in the typical oasis region,in order to investigating the effects of nitrogen application rates and plant percentage of intercropped maize and pea on solar radiation use efficiency(SUE) of different cropping patterns,the purpose of the experiment was to provide academic basis for enhancing productivity of maize pea intercropping.Results showed that,maize pea intercropping could increase the land use efficiency,all of the Land equivalent ratios(LER) of different intercropping systems were higher than 1;compared with 2:4(2 rows of maize,4 rows of pea) intercropping system,the LER of 3:4(3 rows of maize,4 rows of pea) intercropping system was increase by 28.26%.The average SUE of sole maize,sole pea and 2:4,3:4 intercropping system was 0.60%,0.15%,0.53% and 0.60% respectively.Meanwhile,the SUE of 3:4 intercropping treatment that with 15% nitrogen decrease reached 0.75%,it was the most effective treatment in use solar radiation.The 3:4 intercropping could improve the Leaf area index(LAI) and Leaf area duration(LAD) compared to the 2:4 intercropping systems,the average of LAI and LAD was increased by 22.83%-28.27% and 25.49%-27.83% respectively.In this experiment,the higher LAD of the crop showed,the higher SUE was gotten.Improving LAD was an effective way to achieve higher SUE and productivity of crop.