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[1]ZHANG Qiaofeng,LIU Guixiang,YU Hongbo,et al.Monthly and Seasonal Dynamics of ET in Xilingol Steppe and Related Factors Analysis[J].Research of Soil and Water Conservation,2017,24(03):164-169.

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Monthly and Seasonal Dynamics of ET in Xilingol Steppe and Related Factors Analysis

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 03 Page number: 164-169 Column: Public date: 2017-06-28

Title:: Monthly and Seasonal Dynamics of ET in Xilingol Steppe and Related Factors Analysis

Author(s):: ZHANG Qiaofeng^1,2,3,4, LIU Guixiang², YU Hongbo^1,3, YU Shan^1,3, BAO Yuhai^1,3; 1. College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China;
2. Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Hohhot 010010, China;
3. Inner Mongolia Key Laboratory of Remote Sensing and Geography Information System, Hohhot 010022, China;
4. Inner Mongolia Laboratory of Disaster Prevention and Reduction and Ecological Safety Monitoring, Hohhot 010022, China

Keywords:: Xilingol grassland; ET; NDVI; meteorological factors; correlation analysis

CLC:: S812

DOI:: -

Abstract:: Spatiotemporal dynamic of evapotranspiration (ET) plays an important role in understanding the impact of water and heat on vegetation. In the present study, MODIS MOD16A2 and MOD13A3 monthly data and meteorological data were employed to analyze the spatiotemporal dynamics of monthly and seasonal ET in different types of grasslands in recent 15 years (from 2000 to 2014) in Xilingol steppe and the correlation between ET and related factors by means of regression analysis and correlation analysis. The results showed that ET decreased from east to west in Xilingol steppe and in the sequence: meadow steppe > typical steppe and sandy vegetation > desert steppe from March to October. In contrast, ET increased from east to west in Xilingol steppe and in the order: meadow steppe < typical steppe and sandy vegetation < desert steppe in January, February, November and December. The max ET appeared in November in desert steppe, but it reached the maximum value in July in other types of grasslands. The min ET all appeared in May in different types of grasslands. In all types of grasslands, ET had the decreasing trend from March to May, and October, but in January, June, July and December, it had the increasing trend, but all the changes were not significant. In spring, summer and autumn, ET decreased from east to west with meadow steppe > typical steppe and sandy vegetation > desert steppe. In contrast, ET increased from east to west with meadow steppe < typical steppe and sandy vegetation < desert steppe in winter. The max ET appeared in winter in desert steppe, but it reached the maximum value in summer in other types of grasslands. In all types of grasslands, ET had the decreasing trend in spring and autumn, but in summer and winter, it had the increasing trend, but all the changes were not significant. Pearson correlation analysis indicated that there was significant positive correlation (p<0.05) between ET and NDVI and precipitation from March to October and in spring, summer and autumn. On the contrary, in January, February, November, December and in winter, there was no significant negative correlation between ET and precipitation, but significant positive correlation (p<0.05) between ET and mean temperature appeared.

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