关键词: 黑河, 大豆, 受光量, 冠层结构, 产量

Abstract: The local soybean cultivar (Heihe 43) was grown under mulching film and different planting density and chemical control in Jiusanguanliju of Heihe in Heilongjiang in 2015 and 2016. The daily meteorological elements data including temperature, precipitation and insolation duration were collected from 1987-2016 of Nenjiang, Heihe, Heilongjiang, China. Leaf area was measured with an automatic area meter. At pod filling stage, the ten leaves of each layer every 10 cm were chosen for measuring the intercepted radiation with simple integrated solarimeter films. The radiation interception per unit leaf area (IRL), the radiation interception per unit ground area (IRG), the amount of radiation interception of each leaf, LAI (leaf area index) and accumulated radiation interception of layer every 10 cm were calculated. The results showed that the yield in 2015 increased because of more rain, while the drought stress at July-August 2016 seriously affected plant growth and development, the LAI and radiation interception were low, and this leaded to production decrease. The distribution of light within the canopy was linear change, mainly in soybean canopy on top. IRG had highly significant positive correlations to IRL, leaf number, LAI, leaf area, indicating that the canopy structure was a important factor to canopy radiation, the IRL became bigger with the LAI increase. Soybean hundred grain weight and yield were highly positively correlated with IRL, indicated  canopy radiation had important effect on growth and yield of soybean. The mulching film and D2 density (48×104 panicle/hm2) treatment were highest in canopy radiation and yield production. So higher density with mulching film and chemical regulator affected the canopy structure, getting higher LAI and making full use of climatic resources especially the water and radiation interception were important measures to improving the dry matter and yield production.

Key words: Heihe, soybean, radiation interception, canopy structure, yield production