吉兰泰及周边地区蒸散发的时空变化规律

杨宇娜; 汪季; 张成福; 刘军; 王雨晴; 杨利英

引用本文:	杨宇娜,汪季,张成福,等.吉兰泰及周边地区蒸散发的时空变化规律[J].灌溉排水学报,0,():-.
	yangyuna,Wang Ji,Zhang Chengfu,et al.吉兰泰及周边地区蒸散发的时空变化规律[J].灌溉排水学报,0,():-.

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吉兰泰及周边地区蒸散发的时空变化规律
杨宇娜,汪季,张成福,等
内蒙古农业大学沙漠治理学院

摘要:

蒸散发(耗水量)的准确估算对干旱区水资源管理和分配以及生态环境的保护有着重要作用。本研究以吉兰泰为对象,利用MODIS数据通过SEBAL模型估算了研究区2017年植被生长季5-10月的日蒸散发,并分析了蒸散发与环境因子的相关性。结果表明：(1)生长季日平均蒸散量整体趋势呈单峰型分布趋势,日均蒸散量最大值在7月(3.98mm),最小值在10月(1.11mm)；(2)在空间分布上,海拔高的地区蒸散高,海拔低的地区蒸散量低；不同土地利用类型中蒸散发值由大到小分别为林地、耕地、草地、戈壁、沙漠；各土地利用类型蒸散发量的时间动态表现一致,呈现生长期>生长初期>生长后期；(3)归一化植被指数、高程与蒸散发呈现正相关,风速以及地表温度与蒸散发呈负相关。生长初期时温度和风速对蒸散发影响最大,生长期和生长后期对蒸散发影响较大的环境因子是地表温度和高程。SEBAL模型估算的蒸散发结果与陆面蒸散和P-M公式的接近,表明SEBAL模型对本研究区蒸散发的估算是可靠的。

关键词: 干旱区;植被类型;蒸散发;SEBAL模型;MODIS

DOI：

分类号:S157.9

基金项目:国家重点研发计划项目“盐碱湖区沙害防治关键技术研究与示范”(编号：2016YFC0501000)2014年引进人才科研启动基金(编号：RZ1900001647)

Spatial and temporal variations of evapotranspiration in Jilantai and its surrounding areas

yangyuna¹, Wang Ji², Zhang Chengfu², Lui jun², Wang Yuqing², Yang Liying¹

1.College of desert control science and engineering Inner Mongolia Agricultural University;2.College of desert control science and engineering Inner Mongolia Agricultural University

Abstract:

The accurate estimation of evapotranspiration (water consumption) plays an important role in the management and distribution of water resources and the protection of ecological environment in arid areas.Using MODIS data and SEBAL model, the daily evapotranspiration of vegetation growing season from May to October in 2017 in Jilantai was estimated, and the correlation between evapotranspiration and environmental factors was analyzed.The results showed that: (1) the overall trend of daily average evapotranspiration in the growing season showed a single-peak distribution trend, with the maximum in July (3.98 mm) and the minimum in October (1.11 mm); (2) in spatial distribution, the evapotranspiration in high-altitude areas was higher than that in low-altitude areas; and the evapotranspiration value in different land use types was lower than that in high-altitude areas. The time dynamics of evapotranspiration of different land use types are the same, showing growth period > early growth period > late growth period; (3) Normalized vegetation index, elevation and evapotranspiration are positively correlated, wind speed and surface temperature are negatively correlated with evapotranspiration. Temperature and wind speed have the greatest influence on Evapotranspiration in the early growth stage, while surface temperature and elevation have the greatest influence on Evapotranspiration in the later growth stage.The evapotranspiration estimated by SEBAL model is close to land surface evapotranspiration and P-M formula, which indicates that SEBAL model is reliable in estimating evapotranspiration in this area.

Key words: Arid area; Vegetation type; Evapotranspiration; SEBAL model; MODIS