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何昊燊, 彭 涛, 由星莹, 刘伯娟, 董晓华, 刘 冀, 林青霞, 郭家力.汉江流域植被变化及其对多时间尺度气象干旱的响应水资源与水工程学报[J].,2023,34(3):83-92
汉江流域植被变化及其对多时间尺度气象干旱的响应
Vegetation change and its response to multi-time scale meteorological droughts in the Hanjiang River Basin
  
DOI:10.11705/j.issn.1672-643X.2023.03.10
中文关键词:  气象干旱  植被变化  标准化降水指数  干旱响应  多时间尺度  汉江流域
英文关键词:meteorological drought  vegetation change  standardized precipitation index (SPI)  drought response  multi-time scale  Hanjiang River Basin
基金项目:国家自然科学基金项目(52009065);湖北省水利重点科研项目(HBSLKY202109)
作者单位
何昊燊1, 彭 涛1,2, 由星莹3, 刘伯娟4, 董晓华1,2, 刘 冀1,2, 林青霞1,2, 郭家力1,2 (1.三峡大学 水利与环境学院 湖北 宜昌 443002 2.三峡库区生态环境教育部工程研究中心 湖北 宜昌 4430023.湖北省汉江兴隆水利枢纽管理局 湖北 潜江 433126 4.湖北省水利水电规划勘测设计院 湖北 武汉 430070) 
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中文摘要:
      干旱是影响植被生长的重要因素之一,因此研究植被对不同时间尺度干旱的响应具有重要意义。利用1982—2019年汉江流域逐月降水和归一化植被指数(NDVI)数据,计算得到不同时间尺度下的标准化降水指数(SPI)、植被状态指数(VCI)和植被覆盖度(FVC),分析了植被时空变化及对多时间尺度气象干旱的响应特征。结果表明:汉江流域生长季NDVI在时间上呈现波动上升趋势,植被覆盖度在空间上表现为西高东低的分布特点;随着时间尺度的增加,干湿交替频率减小,表征干旱事件对降水的敏感性在降低;从干旱趋势来看,分别有37.62%和62.38%的地区呈现上升和下降趋势;从干旱频率来看,各季干旱高频事件集中在流域中部和东部;在年尺度下,NDVI与SPI-12在大部分地区呈负相关,有43.26%的地区表现为正相关,主要分布在流域中部和东南部;在季尺度下,春季NDVI对SPI-3的响应最明显,85.64%的地区表现为正相关;在月尺度下,汉江流域春季VCISPI-1和SPI-3的影响最为明显,而秋季VCISPI-12的响应更为显著;在不同土地利用类型中,草地和耕地与SPI的相关性较高,说明其对干旱的抵抗力较弱。
英文摘要:
      Drought is one of the important factors affecting vegetation growth, so the study of vegetation response to drought at different time scales is of great significance. The standardized precipitation index (SPI), vegetation condition index (VCI) and fractional vegetation cover (FVC) at different time scales were calculated and the spatio-temporal change of vegetation and its response characteristics to multi-time scale meteorological droughts were analyzed based on the monthly precipitation and normalized difference vegetation index (NDVI) data of the Hanjiang River Basin (HRB) from 1982 to 2019. The results showed that NDVI in the growing season of the HRB showed an upward trend and FVC was spatially higher in the west and lower in the east. With the increase of the time scale, the alternating frequency of dry and wet cycle decreased, indicating that the sensitivity of drought events to precipitation decreased. According to the drought trend, 37.62% and 62.38% of the regions showed an upward and downward trend respectively. From the perspective of drought frequency, high frequency drought events in each season were concentrated in the middle and east of the basin. At the annual scale, there was a negative correlation between NDVI and SPI-12 in most regions, 43.26% of the regions showing a positive correlation, which mainly distributed in the middle and southeast of the HRB. At the seasonal scale, the response of spring NDVI to SPI-3 was the most obvious, and 85.64% of the regions showed positive correlation. At the monthly scale, SPI-1 and SPI-3 had the most obvious influences on VCI in spring, whereas SPI-12 had a greater influence in autumn. Among the different land use types, grassland and arable land were highly correlated with SPI, indicating that they were less resistant to droughts.
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