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作 者 ：高阳;段爱旺;刘祖贵;申孝军

期 刊 ：应用生态学报 2008年 19卷 06期 页码：1248-1254

关键词：大豆；

摘 要 ：于2006—2007年对玉米/大豆窄条带间作系统的光环境特性进行观测，研究间作冠层
内光合有效辐射（PAR）的空间分布，并分析光环境改变对作物产量的影响.结果表明：在
生育早期，大豆条带边行（与玉米相邻行）底部光的透射率高于大豆内行，而玉米条带内行
底部光的透射率高于边行；进入生殖生长后，冠层底部光的透射率变化不明显，平均透射率
小于7%.在生育早期，内行大豆接收到的日平均光量子通量密度（PPFD）比边行高约10%；
1∶3间作模式（I₁处理）下，大豆边行和内行光的透射率均比2∶3间作模式（I₂处理）高15%，表明I₂处理的玉米条带对大豆的遮荫程度大于I₁处理.在大豆开花之后，内行大豆接收到的日平均PPFD与两侧边行有显著差异，但边行之间差异不显著；内行和外行大豆光的透射率分别为38%和27%，但I₁和I₂处理之间差异不显著，表明两种间作模式下玉米条带对大豆的遮荫程度相近.大豆内行的生物量高于边行，而边行之间没有显著差异，表明在充分供水条件下，不同窄条带间作模式对作物生物量的影响主要是由于作物光环境的改变所致.

Abstract:Observations on the light environment characteristics in maize-soybea
n narrow strip intercropping system were made in 2006 and 2007 to study the spatial distribution of photosynthetically active radiation (PAR) in intercropped cr
op canopy, and to analyze the effects of light environment on crop biomass. The results indicated that in early growth period, the light transmittance at the bottom of the edge rows of soybean strips adjacent to maize was higher than that of the inner rows of soybean strips, while it was in adverse for maize strips. The horizontal variation of light transmittance at the bottom of crop canopy did not vary significantly at reproductive stage, and the average light transmittance was less than 7%. In soybean strips, the daily photosynthetic photon flux density (PPFD) above inner rows canopy in early growth period was 10% higher than that above edge rows canopy, and the average light transmittance of edge rows and inner rows in 1∶3 intercropping system (treatment I₁) was about 15% higher than that in 2∶3 system (treatment I₂), indicating that the shading of maize strips on soybean strips was more serious in treatment I₂ than in treatment I₁. After flowering, there was a significant difference in the daily PPFD between inner rows and edge rows of soybean strips, but no significant difference was observed between edge rows. The mean light transmittance of edge rows and inner rows of soybean strips was 27% and 38%, respectively, and there was no significant difference between treatment I₁ and treatment I₂, which indicated that the shading effects of maize strips on soybean strips in treatment I₁ and treatment I₂ were similar at reproductive stage. The biomass of inner rows of soybean strips was larger than that of edge rows, and there was no significant different between edge rows, indicating that under adequate irrigation, the effects of different narrow strip intercropping systems on crop biomass were primarily due to the changes of light environment.

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