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对系统内外太阳辐射的3个波段:紫外辐射(UVR 300～400nm),光合有效辐射(PAR 400～700nm)和近红外辐射(NIR 700～1100nm)进行了分析。对比研究表明,试验期间系统内的光谱成分UVR∶PAR∶NIR∶为5.2∶48.2∶46.6,系统外对照区为5.1∶52.4∶42.5。其中,小麦开花期系统内外分别为5.2∶51.5∶43.2和5.0∶51.9∶43.1,小麦灌浆期分别为4.9∶46.5∶48.6和5.3∶52.6∶42.1,小麦成熟期分别为5.4∶45.0∶49.6和5.0∶53.4∶41.6,从小麦灌浆期开始,桐麦间作系统内的PAR减少较为明显;间作系统对漫射辐射中的PAR吸收阻隔相对多于直射辐射,对近红外辐射的吸收阻隔极少;系统内外的紫外直射辐射(D-UVR)和紫外漫射辐射(S-UVR)占总辐射强度大致相等,均为2%。系统内的直射PAR(D-PAR)占总辐射的含量为30%,低于系统外5%,而漫射PAR(S-PAR)为16%,高于系统外1%。系统内的近红外直射辐射(D-NIR)占总辐射的含量也为30%,低于系统外4%,而近红外漫射辐射(S-NIR)为20%,比系统外的12%高出8%;系统外直射辐射的PAR成分与直射辐射量呈正相关,漫射辐射与总辐射的PAR成分与其辐射量相关不明显,PAR成分趋于常数(52%)。间作系统内直射辐射的PAR成分与其直射辐射量呈正相关,散射辐射与总辐射的PAR成分与其辐射量相关不明显,当辐射量大于150W/m2
Three bands of solar radiation both inside and outside the system were analyzed: ultraviolet (UVR 300 ~ 400nm), photosynthetically active (PAR 400 ~ 700nm) and near infrared (NIR 700 ~ 1100nm). Comparative studies showed that the spectral components UVR: PAR: NIR: were 5.2: 48.2: 46.6 in the system during the experiment and 5.1: 52.4: 42.5 in the out-of-system control. Among them, the wheat inflorescence system were 5.2:51.5:43.2 and 5.0:51.9:43.1, respectively, inside and outside the flowering stage, the wheat filling stage was 4.9:46.5:48.6 and 5.3:52.6:42.1 respectively, and the wheat ripening stage was 5.4:45.0:49.6 and 5.0 respectively : 53.4:41.6. From the beginning of wheat grain filling period, the decrease of PAR in Tongmai intercropping system was more obvious. The interception system had more PAR absorption barrier to diffuse radiation than direct radiation, Both inside and outside UV-direct radiation (D-UVR) and UV-Vis radiation (S-UVR) account for roughly 2% of the total radiation intensity. In-system direct PAR (D-PAR) accounts for 30% of the total radiation, lower than 5% of the system, while diffuse PAR (S-PAR) is 16% higher than the system outside the 1%. The near-infrared direct radiation (D-NIR) in the system accounts for 30% of the total radiation, which is 4% lower than that of the system and 20% of the near-infrared diffuse radiation (S-NIR) Which is higher than 8%. The PAR component of direct radiation outside the system is positively correlated with the direct radiation. The PAR component of diffuse radiation and total radiation is not significantly correlated with the radiation dose, and the PAR component tends to be constant (52%). There is a positive correlation between the PAR component of direct radiation in intercropping system and its direct radiation dose. There is no obvious correlation between the PAR component of scattered radiation and total radiation and its radiation dose. When the radiation dose is more than 150W / m2