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中国农学通报 ›› 2024, Vol. 40 ›› Issue (32): 129-134.doi: 10.11924/j.issn.1000-6850.casb2024-0178

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

基于Landsat-8影像的农田土壤含水量反演研究

武英洁1,2(), 朱永超3(), 孔祥宁1,4   

  1. 1 山东省气象防灾减灾重点实验室,济南 250031
    2 山东省气象数据中心,济南 250031
    3 中国气象局气象探测中心,北京 100081
    4 山东省气候中心,济南 250031
  • 收稿日期:2024-03-11 修回日期:2024-08-18 出版日期:2024-11-15 发布日期:2024-11-12
  • 通讯作者:
    朱永超,男,1987年出生,河南商丘人,高级工程师,博士,主要从事气象探测资料处理算法研究。通信地址:100081 北京市海淀区中关村南大街46号 中国气象局气象探测中心,Tel:010-58995649,E-mail:
  • 作者简介:

    武英洁,女,1997年出生,山东日照人,助理工程师,硕士,主要从事卫星遥感数据处理算法、农业气象研究。通信地址:250031 山东省济南市天桥区无影山路12号 山东省气象局,Tel:0531-81603772,E-mail:

  • 基金资助:
    山东省气象局科研项目“基于多源数据和机器学习的土壤水分估测”(2022SDQN04)

Soil Moisture Inversion in Farmland Based on Landsat-8 Imagery

WU Yingjie1,2(), ZHU Yongchao3(), KONG Xiangning1,4   

  1. 1 Key Laboratory for Meteorological Disaster Prevention and Mitigation of Shandong, Jinan 250031
    2 Shandong Meteorological Data Center, Jinan 250031
    3 Meteorological Observation Centre, China Meteorological Administration, Beijing 100081
    4 Shandong Climate Center, Jinan 250031
  • Received:2024-03-11 Revised:2024-08-18 Published:2024-11-15 Online:2024-11-12

摘要:

快速实时地获取大范围土壤含水量可以为科学有效地应对干旱提供强有力的数据支撑。研究选择河北省定兴县和易县的冬小麦种植区作为研究区域,基于多光谱遥感数据Landsat-8和野外实测土壤含水量数据,构建了垂直干旱指数(PDI)、改进型垂直干旱指数(MPDI)、温度植被旱情指数(TVDI) 3种干旱指数模型来反演研究区土壤含水量,并分析反演结果的精度和适用性。研究结果表明:3种干旱指数计算结果显示研究区整体偏干,不同干旱指数的空间分布存在差异,其中PDI和另外2种干旱指数的差异最大;3种干旱指数均与土壤含水量实测值呈负相关,其中MPDI、TVDI和土壤含水量之间存在较为明显的线性相关关系,从拟合精度来看MPDI表现最优,因此被用于反演研究区的土壤含水量。反演结果显示研究区的含水量整体偏少,主要介于12%~15%,含水量的空间分布特征和地表覆盖特征一致。研究结果证明了MPDI指数在冬小麦冬季干旱监测方面具有较大的应用潜力。

关键词: 冬小麦, Landsat-8, 反演, 土壤含水量, 干旱指数, 多光谱遥感, 垂直干旱指数(PDI), 改进型垂直干旱指数(MPDI), 温度植被旱情指数(TVDI), 干旱监测

Abstract:

The rapid and real-time acquisition of soil moisture in a large range can provide powerful data support for dealing with drought. In this paper, three drought index models, namely perpendicular drought index (PDI), modified perpendicular drought index (MPDI) and temperature vegetation dryness index (TVDI), were constructed to discuss the accuracy and applicability of soil moisture inversion in the winter wheat planting area in Dingxing and Yixian of Hebei based on multi-spectral remote sensing data Landsat-8 and field measured soil moisture data. Three drought index models indicated that the study area was dry, and the spatial distribution of different drought indices was different, among which the difference between PDI and the other two drought indices was the biggest. All the three drought indices were negatively correlated with measured soil moisture, and MPDI, TVDI had obvious linear correlation with soil moisture. MPDI had the highest fitting degree and was used to invert the soil moisture. The inversion results showed that the soil moisture in the study area was relatively low, mainly ranging from 12% to 15%, and the spatial distribution characteristics of soil moisture were consistent with that of land cover. Our study indicated that the MPDI index had great potential for drought monitoring in the winter wheat planting area in winter.

Key words: winter wheat, Landsat-8, inversion, soil moisture, drought index, multi-spectral remote sensing, namely perpendicular drought index (PDI), modified perpendicular drought index (MPDI), temperature vegetation dryness index (TVDI), drought monitoring