• 研究报告 •

### 水层厚度变化对稻田能量分配的影响

1. 1南京信息工程大学生态气象环境研究中心， 南京 210044； 2江苏省农业气象重点实验室， 南京 210044； 3中国气象局国家气候中心， 北京 100081）
• 出版日期:2015-03-10 发布日期:2015-03-10

### Effects of water depth change on energy distribution in paddy rice field.

LIU Bin1,2, HU Ji-chao1,2**, YU Li3

1. (1International Center for Ecology, Meteorology and Environment, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2Key Laboratory of Agricultural Meteorology of Jiangsu Province, Nanjing University of Information Science & Technology, Nanjing 210044, China; 3National Climate Centre, China Meteorological Administration, Beijing 100081, China)
• Online:2015-03-10 Published:2015-03-10

Abstract: The variations of water depth and wetdry alternation in paddy field lead to the energy budget changing vertically. In this paper, an investigation was made to quantify the contribution of water depth, leaf area index and meteorological factors on energy distribution by using multiple regressions. Similar meteorological conditions and leaf area index, which can reduce the differences of energy input and canopy structure respectively, were chosen to quantify the effects of water depth on energy partitioning in a paddy field. The results showed that, with the increase of water depth, both water heat storage and water heat flux above soil layer increased, leading to a decrease in the latent heat during the daytime, especially in the period with sparse canopy. However, due to the decrease in net radiation of water surface in the period with dense canopy, the effects of water depth on the latent heat flux became small. The effect of water depth on sensible heat was not obvious, and could be ignored. The simulated results of the dualsource evapotranspiration model showed that the decrease of water latent heat with the increase of water depth was a major cause reducing the total latent heat, and this phenomenon was more obvious in the period with sparse canopy.