摘要
土地利用剧烈变化对局地气候的影响是当前全球变化与可持续研究关注的焦点问题。该文基于2017年6月16日Landsat 8卫星遥感影像反演耕地利用剧烈变化的三江平原北部地区地表温度数据,刻画了研究时点水旱田分布对地表温度影响的空间特征。结果表明,研究区水田旱地面积占耕地总面积比例分别为58.12%、41.88%,水田平均地表温度比旱地低9.87℃;在村域尺度上,水田面积占比与地表温度均值在0.01水平(双侧)上呈显著负相关关系(P<0.01),该研究时点上水田对地表热环境存在较为明显的降温作用。水旱田不同下垫面因含水量及蒸散量不同造成的能量传递过程差异,使得其分布格局成为地表温度值分异的主要原因。
The impact of rapid land-use conversion on the local climate is the focus of global change and sustainable research.Large-scale upland conversion to paddy fields and its influence on the local climate in the Sanjiang Plain area should be the important content of current climate impact research on human land use activities.In order to explore its influence on the land surface temperature,we used the atmospheric correction temperature inverse method based on the Landsat 8 TIRS remote sensing image data on June 16,2017.The basic principle of this method is to remove the atmospheric influence and use the atmospheric radiation transfer equation;surface heat radiation intensity observed by the satellite is converted to the corresponding surface temperature.The parameters involved are mainly atmospheric profile parameters and surface specific emissivity.Through the temperature inversion,the surface temperature data of the northern part of the Sanjiang Plain was obtained.Then,the mean-standard deviation method was used to divide the overall temperature data of the cultivated land in the study area into five different grades,which visually showed the overall distribution characteristics of the land surface temperature values of the cultivated land in the study area.The land-use data was updated and obtained from the national rural land survey data,which scale was 1∶10000.On this basis,we analyze the correlation between the paddy field planting area and the average land surface temperature in the different paddy field planting level divisions,and characterized the space effect of different patterns of dry field and paddy fields on the surface temperature feature.Through this series of data statistics and analysis process,the following results can be obtained:the research area we selected is the cultivated land concentration area,and the cultivated land area within the scope is 73.63%.Cultivated land types in the study area are mainly paddy fields and dry land.The paddy field planting area is 7.2×10^5 hm^2,accounting for 58.12%of the total area of cultivated land,while the dry field planting area is slightly lower than that of paddy field with area 5.2×10^5 hm^2,accounting for 41.88%.According to the zoning statistics,we know that in the paddy field planting area average surface temperature in the interior is 27.73℃,while the average surface temperature in the dry field is 37.60℃,which is 9.87℃higher than that in the paddy field.In addition,from the aspect of spatial distribution,the surface temperature is lower in the northwest and the north which is higher in the southwestern part and the eastern part of the study area.After correlation analysis,we find that the paddy field area ratio and the surface temperature mean value are significantly negative at 0.01(two sides)(P<0.01).These findings reveal that different underlying surface types in the arable area are the necessary factors of surface temperature differentiation.During the study period,the paddy field has a significant cooling effect on the land surface thermal environment.The variation in energy transfer process caused by different water content and evapotranspiration in different underlying surfaces of dry field and paddy fields makes its distribution pattern the main cause of land surface temperature value differentiation.
作者
杜国明
刘文琦
于佳兴
张爽
Du Guoming;Liu Wenqi;Yu Jiaxing;Zhang Shuang(College of Resources and Environmental Sciences,Northeast Agricultural University,Harbin 150030,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2019年第5期259-267,F0004,共10页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金项目(41571167)
黑龙江省博士后科研启动金资助项目(LBH-Q17018)
关键词
遥感
温度
耕地
水田格局
三江平原
remote sensing
temperature
cultivated land
paddy field pattern
Sanjiang Plain
