WANG Kaili, WANG Zhihui, XIAO Peiqing, et al. Assessment on the Impact of Climate and the Changes of Underlying Surface on the Evapotranspiration in the Loess Plateau[J]. 2022, 36(3): 166-172.
DOI:
WANG Kaili, WANG Zhihui, XIAO Peiqing, et al. Assessment on the Impact of Climate and the Changes of Underlying Surface on the Evapotranspiration in the Loess Plateau[J]. 2022, 36(3): 166-172. DOI: 10.13870/j.cnki.stbcxb.2022.03.024.
Assessment on the Impact of Climate and the Changes of Underlying Surface on the Evapotranspiration in the Loess Plateau
其相对贡献率最大(32.1%);不同气象要素对黄土高原ET相对贡献率大小为降雨(14.6%)>饱和水汽压差(13.2%)>温度(12.4%)>日照时数(10.0%);非植被下垫面变化(水土保持工程措施等)对ET变化的影响作用不容忽视。(3)气象要素和增强型植被指数(enhanced vegetation index
This study aimed to reveal the spatial-temporal variation of evapotranspiration (ET) in the loess Plateau during the past two decades and clarify the effects of climate and underlying surface changes on ET. Based on the data of 295 meteorological stations on the Loess Plateau
PML_V2 ET products and MOD13A1 EVI products
this study used trend analysis and multiple regression statistical methods to study the spatial-temporal variation characteristics of ET from 2000 to 2018
and the relative contributions of rainfall
temperature
sunshine duration
vapor pressure difference
vegetation and non-vegetation underlying surface were also quantitatively evaluated. The results showed that:(1) From 2000 to 2018
the annual change rate of ET on the Loess Plateau was 4.47 mm/a. The ET increased significantly in Shanxi
Qinghai and northern Shaanxi Provinces
accounting for 62.8% of the total area. The contribution of different land covers to ET was forest
farmland
grassland and shrub in descending order. (2) The significant increase of vegetation was the leading factor of ET changes in the Loess Plateau
and its relative contribution rate was the largest (32.1%). The relative contribution rates of different meteorological factors to ET from high to low were rainfall (14.6%)
saturated vapor pressure difference (13.2%)
temperature (12.4%) and sunshine duration (10.0%). The influence of non-vegetation underlying surface change (such as soil and water conservation engineering measures) on ET change could not be ignored.(3) The effects of meteorological factors and enhanced vegetation index on ET of forest and grass cover were greater than that of farmland cover
while non vegetation underlying surface elements had a greater impact on ET of farmland cover. The research results are expected to provide scientific support for water resources consumption
restoration and sustainability evaluation of ecological construction in the Loess Plateau.
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