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作者利用日本EKO公司的天空辐射表(外层玻璃罩为WG-295,透过波段为295-2,800纳米)、GG—395(395—2,800纳米)和RG715(715—2,800纳米)滤光罩,在广东省珠江三角洲地区的甘蔗田测定总辐射、近红外辐射、可见辐射和紫外辐射,以及这些光谱成分辐射在甘蔗上的反射、透射和吸收情况,测定不同下垫面对不同光谱成分辐射的反射状况。观测工作在1982年进行。 根据测定数据,得到下列初步结果: (1)在晴天条件下,当太阳高度角大于35°时,各光谱带的比率是:红外占53％,可见占43％,紫外占4％。有云天可见辐射的比率增加,最大可超过50％。年平均可见辐射可达48％。 (2)几种不同下垫面对红外辐射的反射率的大小顺序是:绿色植物最高,可达50％以上,其次是土壤,水面最低;可见辐射则是绿色植物最低,水面次之,土壤最高。 (3)甘蔗对可见辐射,红外辐射和总辐射的响应完全不同。其结果如表2所示。在甘蔗田中对于反射辐射,可见与红外的关系是 PAR_反射=0.101 NIR_反射-0.004对于透射辐射,可见与红外的关系是 PAR_透射=0.12 NIR_透射+0.03对于吸收辐射,可见与红外的关系是 PAR_吸收=2.53 NIR_吸收+0.13
Using the Japanese EKO sky radiometer (WG-295 in the outer cover, 295-2,800 nm in the transmission band), GG-395 (395-2,800 nm) and RG715 (715-2,800 nm) Determination of total radiation, near-infrared radiation, visible radiation and ultraviolet radiation in sugarcane fields in the Pearl River Delta of Guangdong Province, and the reflection, transmission and absorption of these spectral components on sugarcane, and the effects of different underlying surfaces on the radiation of different spectral components Reflected conditions. Observations were conducted in 1982. Based on the measured data, the following preliminary results are obtained: (1) Under sunny conditions, when the solar elevation angle is greater than 35 °, the ratio of each spectral band is: IR 53%, visible 43%, UV 4%. There is an increase in the ratio of visible radiation to sky, up to more than 50%. The average annual visible radiation up to 48%. (2) The order of the reflectivity of several different underlying surfaces against infrared radiation is as follows: the highest green plants, up to 50%, followed by the soil, the lowest water surface; the visible radiation is the lowest green plants, followed by the water highest. (3) sugarcane’s response to visible radiation, infrared radiation and total radiation are totally different. The results are shown in Table 2. In the sugarcane field for reflected radiation, visible and infrared relationship is PAR_ref = 0.101 NIR_reflection -0.004 For transmitted radiation, we can see the relationship with the infrared is PAR_transmittance = 0.12 NIR_transmission +0.03 For the absorption of radiation, visible and infrared The relationship is PAR_ absorption = 2.53 NIR_ absorption +0.13