| 沙质麦田太阳辐射特征及小麦的光能转化率研究 |
| |
| 引用本文： | 李玉霖.沙质麦田太阳辐射特征及小麦的光能转化率研究[J].中国沙漠,1999,19(Z1):120-123. |
| |
| 作者姓名： | 李玉霖 |
| |
| 作者单位： | 中国科学院兰州沙漠研究所, 兰州 730000 |
| |
| 基金项目： | 本文得到96-920-13-02、49890330、980121、KE-952-91-218、KE-95 T-04-01-04项目的资助 |
| |
| 摘 要： | 从5月10日至5月24日对麦田内的太阳总辐射、反射辐射及透射辐射进行了连续监测,同时测定了小麦地上地下生物量、叶面积系数、小麦群丛平均高度和小麦热值等指标。结果表明:①测定期间太阳辐射总量为377.53MJ·m-2,反射辐射总量为83.45MJ·m-2,透射辐射总量301.78MJ·m-2,相应的反射率为0.221,透射率为0.799,透射率偏大与小麦的播种方式有关;②下垫面小麦叶面积系数及高度的变化没有引起反射率的大幅度改变,反射率的波动范围在0.18~0.24之内;③透射率随叶面积系数和小麦平均高度的增大具有明显的下降趋势;④5月10日至5月24日,小麦共固定能量4.41MJ·m-2,约占总辐射能的1.17%。
|
| 关 键 词： | 沙质麦田 太阳总辐射 反射辐射 透射辐射 光能转化率 |
Solar Radiation Features and the Conversion Efficiency in Spring at Sandy Wheatlands |
| |
| LI Yu-lin.Solar Radiation Features and the Conversion Efficiency in Spring at Sandy Wheatlands[J].Journal of Desert Research,1999,19(Z1):120-123. |
| |
| Authors: | LI Yu-lin |
| |
| Institution: | Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 730000, China |
| |
| Abstract: | Through monitoring solar total radiation, reflective radiation and perspective radiation, and measuring the wheat's biomass, LAI (Leaf Area Indicator), average height and caloric value from 10th to 24th May, we have come to conclusions as follows: ① The solar total radiation, reflective radiation and perspective radiation are 377.53 MJ·m-2, 83.45 MJ·m-2 and 301.78 MJ·m-2, relatively; albedo and perspective radiation ratio are 0.221 and 0.799. And the more deviation of perspective radiation ratio maybe concerns the sowing way of wheat. ② Changes of wheat's LAI and average height don't cause large scale variation of albedo which only varies from 0.18 to 0.24. ③ Perspective radiation ratio obviously decreases with the increasing of wheat's LAI and average height. ④ The total fixation energy, occupying 1.17 percent of solar total radiation, was 4.4 MJ·m-2 from 10th to 24th May. |
| |
| Keywords: | Sandy wheatland Solar total radiation Reflective radiation Perspective radiation Conversion efficiency |
|
| 点击此处可从《中国沙漠》浏览原始摘要信息 |
| 点击此处可从《中国沙漠》下载免费的PDF全文 |
|
