亚热带地区水稻田地表反照率变化特征

发布时间：2018-05-18 23:05

本文选题：水稻田 + 地表反照率　；参考：《中国生态农业学报》2017年11期

【摘要】：利用地面实测资料研究稻田地表反照率,一方面可以更好地刻画以稻田为主要土地利用方式的流域地气之间的能量分配过程;另一方面,可以为陆面模式提供更为准确的参数值,以及为遥感反演的地表反照率提供验证,从而为更好地解释土地利用/覆被变化对全球气候变化的影响机制提供参考。本文利用江苏省农业科学院溧水试验基地四分量仪测得的2016年稻田地表反照率数据,分析了稻田地表反照率特征,并结合同期观测的太阳短波辐射、温度、湿度、风速、风向等气象数据,进行相关性分析,识别影响稻田地表反照率的主要气象因子,为进一步量化地表反照率与温度及湿度等的参数化关系提供参考。结果表明:晴天稻田地表反照率整体上呈"U"型分布,中午较低,下午和上午较高。晴天稻田地表反照率在一天内的变化呈不对称特性,其不对称性主要是由露水和风速、风向引起。太阳高度角较小时,露水的散射作用使得上午时分的地表反照率值较下午高;而太阳高度角较大时,西南风促使作物叶面倾斜,从而使得下午的地表反照率值较上午高。稻田晴天地表反照率值较阴雨天高。地表反照率在晴天与出射短波辐射相关系数最高(0.670,P0.01),在阴天与相对湿度之间的相关程度最高(-0.480,P0.05)。在整个观测期间,稻田生长季内地表反照率呈现先升高后降低的趋势,地表反照率最高值出现在灌浆期到成熟期之间,插秧到分蘖期之间最低,其中灌浆期地表反照率与太阳短波辐射及湿度间的相关程度较高,并且均通过了P0.01显著性检验。分蘖期和拔节期是水稻生长季内地表反照率变化较快的两个生育期,并受气象因素的显著影响。
[Abstract]:On the one hand, the study of surface albedo in paddy field by using the measured data on the ground can better depict the energy distribution process between the basin and the atmosphere with the paddy field as the main land use mode, on the other hand, It can provide more accurate parameter values for the land surface model and verify the surface albedo retrieved by remote sensing, thus providing a reference for better explanation of the impact mechanism of land use / cover change on global climate change. In this paper, the surface albedo data of rice field measured by four component instrument of Lishui Experimental Base of Jiangsu Academy of Agricultural Sciences in 2016 are used to analyze the characteristics of surface albedo in rice field, and combined with solar short-wave radiation, temperature, humidity and wind speed observed in the same period. The correlation analysis of meteorological data such as wind direction is carried out to identify the main meteorological factors that affect the surface albedo of rice field and to provide a reference for further quantifying the parameterized relationship between surface albedo and temperature and humidity. The results showed that the surface albedo of rice field on sunny days was "U" type, lower at noon and higher in afternoon and morning. The variation of surface albedo in sunny rice field is asymmetric in one day, and the asymmetry is mainly caused by dew, wind speed and wind direction. When the solar height angle is small, the scattering effect of dew makes the surface albedo value higher in the morning than in the afternoon, and when the solar height angle is larger, the southwest wind causes the crop leaf surface to tilt, thus making the surface albedo value higher in the afternoon than in the morning. The surface albedo of rice field on sunny days is higher than that on rainy days. The correlation coefficient between surface albedo and outgoing shortwave radiation is the highest in sunny days (0.670), and the correlation between surface albedo and relative humidity (RH) is the highest (-0.480) (P0.05). During the whole observation period, the surface albedo increased first and then decreased in the growing season of rice field. The highest value of surface albedo appeared in the period of filling and maturing, and the lowest between transplanting seedling and tillering stage. The correlation between surface albedo and solar shortwave radiation and humidity was higher during filling period, and all of them passed the P0.01 significance test. Tillering stage and jointing stage were the two growing periods in which the surface albedo changed rapidly in the growing season of rice and was significantly affected by meteorological factors.
【作者单位】：南京信息工程大学江苏省农业气象重点实验室;江苏省农业科学院农业资源与环境研究所;
【基金】：国家自然科学基金项目(41571026,71373130) 南京信息工程大学本科生优秀毕业论文(设计)支持计划项目资助~~
【分类号】：S161

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