引用本文: | 蒋博武,孟丹,郭晓彤,等.基于Landsat-8遥感数据的冬小麦种植区地表蒸散量时空分布研究[J].灌溉排水学报,2022,():-. |
| jiangbowu,mengdan,guoxiaotong,et al.基于Landsat-8遥感数据的冬小麦种植区地表蒸散量时空分布研究[J].灌溉排水学报,2022,():-. |
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摘要: |
(备注:投稿“农业水资源配置与利用专刊”)【目的】本研究旨在估算冬小麦不同物候期蒸散量,为科学灌溉提供依据,对保证粮食生产具有非常重要的意义。【方法】本研究以河南省商丘市梁园区作为研究区,选取Landsat-8遥感数据、气象数据等,利用监督分类结合阈值法提取冬小麦种植区,采用SEBS模型估算蒸散量,分析研究区内冬小麦和其他土地利用类型蒸散量的时空变化特征。【结果】①冬小麦提取总体精度0.88,kappa系数0.75,梁园区冬小麦占耕地面积66.85%,占总土地面积43.96%。②蒸散量随季节变化,研究区平均蒸散量表现为夏季>春季>秋季>冬季。③分析不同时期不同土地利用类型蒸散量频率,在冬小麦播种期、分蘖期、拔节期和抽穗期不同土地利用类型的蒸散量频率分布集中,在冬小麦收获期不同用地类型蒸散量频数分布离散。其中冬小麦蒸散量表现为:抽穗期>拔节期>收获期>播种期>分蘖期。【结论】本研究通过与低分辨率的MOD16A2数据及气象观测数据对比,说明Landsat中分辨数据及SEBS模型在分析冬小麦及其他用地类型蒸散量时空分布规律方面的优势。 |
关键词: Landsat-8;SEBS模型;蒸散发;冬小麦;物候 |
DOI: |
分类号:S127 |
基金项目: |
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Research on Temporal and Spatial Distribution of Surface Evapotranspiration in Winter Wheat Planting Area Based on Landsat-8 images |
jiangbowu, mengdan, guoxiaotong, zhulin
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Capital Normal University
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Abstract: |
【Objective】 This study aims to estimation of evapotranspiration in different phenological periods of winter wheat is of great significance for guaranteeing grain production by providing basis for scientific irrigation.【Method】 In this study, Liangyuan District, Shangqiu City, Henan Province was used as the research area, Landsat-8 remote sensing data, meteorological data, etc. were selected, and the winter wheat planting areas were extracted using the supervision classification combined with the threshold method, and the SEBS model was used to estimate the evapotranspiration. The spatial-temporal variation characteristics of evapotranspiration of winter wheat and other land use types in the study area were analyzed.【Result】①The overall accuracy of winter wheat extraction is 0.88, and the Kappa coefficient is 0.75. The proportion of winter wheat in Liangyuan District is 66.85% of the arable land and 43.96% of the total land area. ②The evapotranspiration varies with the seasons of winter wheat phenology. The overall average evapotranspiration in the study area is summer>spring>autumn>winter. ③Analyze the frequency of evapotranspiration in different periods. The frequency distribution of evapotranspiration of different land use types is concentrated at during the sowing, tillering, jointing and heading periods of winter wheat, while the frequency distribution of evapotranspiration of different landuse during the winter wheat harvesting period is discrete. The evapotranspiration of winter wheat is as follows: heading stage> jointing stage> harvest stage>sowing date>tillering date.【Conclusion】By comparing with low-resolution MOD16A2 data and meteorological observation data, this study illustrates the advantages of Landsat"s distinguished data and SEBS model in analyzing the temporal and spatial distribution of evapotranspiration of winter wheat and other land types. |
Key words: Landsat-8;SEBS;evapotranspiration;Winter wheat;Phenology |