基于NDVI遥感反演的半干旱沙区耕地地表温度异质性研究
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摘要
土地荒漠化是半干旱沙区突出的生态环境问题,土地利用是导致该区域土地荒漠化的主要原因,在荒漠化呈整体逆转、局部扩张的背景下,基于地块尺度研究半干旱沙区耕地利用特征,对进一步防治荒漠化、实现生态恢复具有重要意义。本文利用遥感反演的地表温度,分析耕地地块的地表温度特征,并分析形成该特征的原因。结果表明,耕地地表温度总体分布范围较大;在耕地地块温差方面,地块温差较大,遥感影像的行编号条带号为030/120部分的耕地地块温差在0～10 K之间,行编号条带号为030/119部分的耕地地块温差在0～11 K之间,且地块温差大的耕地面积所占比例大;耕地地块边缘的地表平均温度高于地块平均温度。科左后旗自然降水量的空间分异使得耕地地表温度范围较大。坨甸微地形导致自然降水重新分配和耕地地块存在一定高差造成耕地地块温差较大。微地形条件、土壤质量及农业管理措施共同导致了耕地地块边缘的地表温度较高。基于以上研究结果,认为在半干旱沙区进行耕地质量评价时,评价单元的确定宜采用网格法;建议对耕地地块边缘的耕地进行退耕,以进一步防治土地荒漠化和恢复生态。
Desertification is the prominent eco-environmental problem in semi-arid and sandy land area. And land use is the main driving force of desertification. The development process of desertification has been primarily curbed in general but kept expanding in partial locations. At the circumstance, it is significantly beneficial for anti-desertification and ecological restoration to study the cultivated land use characteristics based on cultivated land particles in the semi-arid and sandy land area. Materials applied in this paper included Landsat-8 remote sensing images, land use/cover maps, atmospheric water vapour content, DEM and soil nutrient data. Split window method was used to calculate land surface temperature of cultivated land. And characteristics of land surface temperature of cultivated land and its causes were analyzed. The results showed that the range of land surface temperature of cultivated land was wide. The minimum and maximum of land surface temperature of cultivated land in row/path 030/120 remote sensing image were 294.03 K and 308.61 K. And those in row/path 030/119 remote sensing image were 291.43 K and 310.62 K. The temperature ranges whose cultivated land area accounting for more than 10% of the total cultivated land, included [297 K, 298 K], [298 K, 299 K], [299 K, 300 K], [300 K, 301 K], and [301 K, 302 K] in row/path 030/120 remote sensing image. And those were [300 K, 301 K), [301 K, 302 K), [302 K, 303 K), [303 K, 304 K) in row/path 030/119 remote sensing image. The spatial variation of precipitation resulted in a large spatial variation of crop growth condition in Horqin Left Back Banner, which resulted in a large range of land surface temperature of cultivated land. As to the temperature difference of cultivated land particles, land surface temperature range of cultivated land particles in row/path 030/120 remote sensing image was between 0 and 10 K and that in row/path 030/119 remote sensing image was between 0 and 11 K. This indicated that land surface temperature difference of cultivated land particle was large. Furthermore, the area of cultivated land particles with large land surface temperature difference took a large proportion. The areas of cultivated land particles with land surface temperature difference greater than 3 K in row/path 030/120 and 030/119 remote sensing images took percentages of 36.895% and 57.971% respectively. The areas of cultivated land particles with land surface temperature difference greater than 4 K in row/path 030/120 and 030/119 remote sensing images took percentages of 16.841% and 41.571% respectively. This was attributed to the redistribution of precipitation along dune-interdune and the elevation difference of cultivated land particle. As to the land surface temperature at cultivated land particle margin, among 22107 cultivated land particles in row/path 030/120 remote sensing image, average land surface temperature at the marginal area of cultivated land was greater than that of the cultivated land particle in 13268 cultivated land particles. And among 1644 cultivated land particles in row/path 030/119 remote sensing image, average land surface temperature at the marginal area of cultivated land was greater than that of the cultivated land particle in 866 cultivated land particles. Both areas took percentages of 73.71% and 53.80% respectively in both cultivated land areas. And micro-topography, soil quality and management measures induced this phenomenon. According to the results above, we reckon that grid method should be adopted in cultivated land quality evaluation in semi-arid and sandy land area. Cultivated land at the margin of cultivated land particle should be de-farmed in order to anti-desertification and ecological restoration.
Desertification is the prominent eco-environmental problem in semi-arid and sandy land area. And land use is the main driving force of desertification. The development process of desertification has been primarily curbed in general but kept expanding in partial locations. At the circumstance, it is significantly beneficial for anti-desertification and ecological restoration to study the cultivated land use characteristics based on cultivated land particles in the semi-arid and sandy land area. Materials applied in this paper included Landsat-8 remote sensing images, land use/cover maps, atmospheric water vapour content, DEM and soil nutrient data. Split window method was used to calculate land surface temperature of cultivated land. And characteristics of land surface temperature of cultivated land and its causes were analyzed. The results showed that the range of land surface temperature of cultivated land was wide. The minimum and maximum of land surface temperature of cultivated land in row/path 030/120 remote sensing image were 294.03 K and 308.61 K. And those in row/path 030/119 remote sensing image were 291.43 K and 310.62 K. The temperature ranges whose cultivated land area accounting for more than 10% of the total cultivated land, included [297 K, 298 K], [298 K, 299 K], [299 K, 300 K], [300 K, 301 K], and [301 K, 302 K] in row/path 030/120 remote sensing image. And those were [300 K, 301 K), [301 K, 302 K), [302 K, 303 K), [303 K, 304 K) in row/path 030/119 remote sensing image. The spatial variation of precipitation resulted in a large spatial variation of crop growth condition in Horqin Left Back Banner, which resulted in a large range of land surface temperature of cultivated land. As to the temperature difference of cultivated land particles, land surface temperature range of cultivated land particles in row/path 030/120 remote sensing image was between 0 and 10 K and that in row/path 030/119 remote sensing image was between 0 and 11 K. This indicated that land surface temperature difference of cultivated land particle was large. Furthermore, the area of cultivated land particles with large land surface temperature difference took a large proportion. The areas of cultivated land particles with land surface temperature difference greater than 3 K in row/path 030/120 and 030/119 remote sensing images took percentages of 36.895% and 57.971% respectively. The areas of cultivated land particles with land surface temperature difference greater than 4 K in row/path 030/120 and 030/119 remote sensing images took percentages of 16.841% and 41.571% respectively. This was attributed to the redistribution of precipitation along dune-interdune and the elevation difference of cultivated land particle. As to the land surface temperature at cultivated land particle margin, among 22107 cultivated land particles in row/path 030/120 remote sensing image, average land surface temperature at the marginal area of cultivated land was greater than that of the cultivated land particle in 13268 cultivated land particles. And among 1644 cultivated land particles in row/path 030/119 remote sensing image, average land surface temperature at the marginal area of cultivated land was greater than that of the cultivated land particle in 866 cultivated land particles. Both areas took percentages of 73.71% and 53.80% respectively in both cultivated land areas. And micro-topography, soil quality and management measures induced this phenomenon. According to the results above, we reckon that grid method should be adopted in cultivated land quality evaluation in semi-arid and sandy land area. Cultivated land at the margin of cultivated land particle should be de-farmed in order to anti-desertification and ecological restoration.
引文
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[7]乌兰图雅.科尔沁沙地近50年的垦殖与土地利用变化[J].地理科学进展,2000,19(3):273-278.Wulantuya.Land reclamation and land-use changes during last 50 years in Ke'erqin Deserts,Inner Mongolia[J].Progress in Geography,2000,19(3):273-278.(in Chinese with English abstract)
[8]谢花林,李波.基于logistic回归模型的农牧交错区土地利用变化驱动力分析:以内蒙古翁牛特旗为例[J].地理研究,2008,27(2):294-304.Xie Hualin,Li Bo.Driving forces analysis of land-use pattern changes based on logistic regression model in the farming-pastoral zone:A case study of Ongiud Banner,Inner Mongolia[J].Geographical Research,2008,27(2):294-304.(in Chinese with English abstract)
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[11]贾科利,李群.农牧交错区农户耕地变化实证分析[J].中国农学通报,2017,33(27):107-111.Jia Keli,Li Qun.Empirical analysis of farmland change in farming-pastoral interlaced region[J].Chinese Agricultural Science Bulletin,2017,33(27):107-111.(in Chinese with English abstract)
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