Liang Shouzhen,Wang Meng,Han Dongrui,et al.Analysis of Relationship Between Temperature Vegetation Dryness Index and Soil Moisture at Multiple Temporal Scales and Drought Monitoring[J].Research of Soil and Water Conservation,2024,31(02):149-157.
TVDI与土壤湿度关系的多时间尺度分析与旱情监测
- Title:
- Analysis of Relationship Between Temperature Vegetation Dryness Index and Soil Moisture at Multiple Temporal Scales and Drought Monitoring
- 文章编号:
- 1005-3409(2024)02-0149-09
- Keywords:
- vegetation index; land surface temperature; drought; temporal scales
- 分类号:
- TP79; S152.7
- 文献标志码:
- A
- 摘要:
- [目的]揭示不同时间尺度的TVDI与土壤湿度的关联关系,确定反映土壤湿度的最佳时间尺度,以更为准确地获取土壤湿度信息,精准监测旱情。[方法]以3种不同时间尺度(8 d,16 d和月)的遥感地表温度、反射率数据以及山东省31个地面观测站土壤湿度数据为基础,分析不同时间尺度下植被指数-温度空间特征,建立不同时段不同时间尺度温度植被干旱指数(TVDI)的热边和冷边函数,研究TVDI与土壤湿度之间的关联性随时间尺度的变化规律,确定了区域土壤墒情监测的时间尺度,反演了区域土壤湿度,监测旱情。[结果]植被指数-温度二维空间形状呈三角形,但随时间发生改变; 二维空间中植被指数与最大、最小温度之间有明显的线性关系,湿边并非理想的与坐标轴平行的直线; TVDI与土壤湿度线性相关,但两者之间的紧密程度随时间尺度而变,8 d尺度的TVDI与土壤湿度有更高的相关系数; 山东省冬小麦旱情与降水高度一致。[结论]短时间尺度的TVDI更适于区域的旱情监测,尽管人工灌溉有效降低了对降水的需求,但降水的多寡仍是影响区域小麦旱情的主要因素。
- Abstract:
- [Objective] The aim of this study is to explore relations between different temporal scales TVDI and soil moisture and determine the best temporal scale inversing soil moisture. It is important to accurately acquire the soil moisture information for the monitoring and the response to drought disaster. [Methods] There are many methods to monitor drought using remotely sensed data. An index in combination with land surface temperature and vegetation index is frequently utilized. In this research, the remotely sensed data including reflectance and land surface temperature on three temporal scales(8-day, 16-day, monthly)were used to calculate temperature vegetation dryness index(TVDI), to analyze relationships between TVDI and soil moisture, and to determine the preferential temporal scale to monitor soil moisture. [Results] The vegetation index was linearly related to max and min land surface temperature at three temporal scales. At different temporal scales, there was a significant relationship between TVDI and soil moisture. However, 8-day TVDI demonstrated a closer relationship with soil moisture and with increasing temporal scales, the relationship between them became weak. In Shandong Province, the drought distribution was in accordance with precipitation. [Conclusion] It is suggested that TVDI can indicate soil moisture and should be used preferentially at the short temporal scale, and precipitation has important influence on wheat drought in Shandong Province.
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备注/Memo
收稿日期:2023-02-26 修回日期:2023-05-24
资助项目:山东省自然科学基金面上项目(ZR2020MD019); 山东省农业科学院知识创新工程(CXGC2023B01); 国家重点研发计划(2021YFB3901303)
第一作者:梁守真(1979—),男,山东阳谷人,博士,副研究员,主要从事生态环境遥感研究。E-mail:szliang_cas@163.com
通信作者:隋学艳(1980—),女,山东蓬莱人,硕士,研究员,主要从事农业遥感研究。E-mail:sdnkysxy@163.com