| 邓锦山,李卓蔓,陈尚书,陈玥,李良冬.基于TVDI的攀西地区干旱时空变化特征研究[J].干旱地区农业研究,2024,(1):252~260 |
| 基于TVDI的攀西地区干旱时空变化特征研究 |
| Temporal and spatial variation characteristics of drought in Panxi region based on TVDI |
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| DOI：10.7606/j.issn.1000-7601.2024.01.26 |
| 中文关键词: 干旱 遥感监测 温度植被干旱指数（TVDI） 时空变化 攀西地区 |
| 英文关键词:drought remote sensing monitoring TVDI temporal and spatial variation Panxi region |
| 基金项目:四川省水安全与水旱灾害防御中心重点科技专项（SCWZDL-202205-HQJC01）；四川省科技厅基本科研业务费项目(2022-SKY-ZXKY-7) |
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| 中文摘要: |
| 利用MODIS地表温度数据（LST）和归一化植被指数（NDVI）构建Ts-NDVI特征空间，通过计算温度植被干旱指数（TVDI）详细分析了攀西地区2001—2020年干旱时空变化规律。结果表明：（1）从时间角度来看，20年间攀西地区TVDI年均值介于0.5481~0.5820，以-0.0001·a-1速率缓慢减小，且在2001年和2009年出现大范围中旱。季节性干旱特点表现为冬干春旱，各季TVDI均值分别为冬季0.5618、春季0.6058、夏季0.5590、秋季0.5365，表明冬、春两季较夏、秋两季更容易形成干旱。TVDI月均最大值出现在5月份，为0.6089；最小值出现在9月份，为0.5204；每年2—6月以中旱为主；7月起旱情减轻，转为轻旱；10月起旱情逐渐加重。（2）从空间角度来看，攀西地区旱情变化趋势南北差异明显，南部干旱发生的频率和范围大于北部地区，呈现出中部、南部及西南部高，北部、西北部及东北部低的空间分布特征。（3）从典型干旱年份来看，攀西地区2001年、2006年和2011年春旱耕地在空间分布上具有一定的相似性。其中，受中旱的耕地主要分布在攀西北部和中部；而受重旱的耕地主要集中分布在攀西西南部。研究结果表明，2001—2020年攀西地区旱情稍有缓解，不同季节间干旱差异性较大，干旱范围以攀西中部和南部为主。 |
| 英文摘要: |
| Land surface temperature data (LST) and normalized vegetation index (NDVI) of MODIS were used to construct Ts-NDVI feature space, and the temporal and spatial variation of drought in Panxi region from 2001 to 2020 were analyzed by calculating the temperature vegetation drought index (TVDI). The results showed that:(1) From the perspective of time, the annual mean TVDI in Panxi area varied between 0.5481 and 0.5820 in 2001-2020, and decreased slowly at a rate of -0.0001·a-1, and there was a large\|scale medium drought in 2001 and 2009. The seasonal drought was characterized by dry winter and dry spring. The average TVDI of each season was 0.5618 in winter, 0.6058 in spring, 0.5590 in summer and 0.5365 in autumn, indicating that drought was more likely to occur in winter and spring than in summer and autumn.The monthly average value of TVDI was 0.6089 in May, the lowest value was 0.5204 in September. From February to June each year, the drought was mainly moderate. The drought eased in July and turned to light drought. In October, the drought gradually increased from light drought. (2) From the perspective of space, there was a significant difference between the north and the south in the variation trend of drought in Panxi. The frequency and scope of drought in the south were higher than those in the north, showing a spatial distribution characteristic of higher in the middle, south, southwest, and lower in the north, northwest,northeast. (3) From the perspective of typical drought years, the spatial distribution of spring dry farmland in Panxi in 2001, 2006 and 2011 had certain similarities. Among them, the cultivated land affected by moderate drought was mainly distributed in the north and middle of Panxi. The cultivated land affected by severe drought was mainly distributed in the southwest of Panxi. The results showed that the drought situation in Panxi eased slightly from 2001 to 2020, and the drought varied greatly among different seasons, and the drought scope was mainly in the central and southern Panxi. |
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