Contributions of Land Use/Cover Change to the Change of Evapotranspiration in Qinhuai River Basin

doi:10.3969/j.issn.1000-6362.2019.05.001

Abstract

Abstract:

In order to evaluate the impact of land use/cover change (LUCC) caused by the urbanization on the variation of basin-scale evapotranspiration (ET), the Qinhuai River basin in the Yangtze River Delta was selected as the research area. Based on the images of Landsat satellites in 2000 and 2013, the land use/cover maps of Qinhuai River basin were extracted by using the decision tree model, and the grid-scale ET in typical day of each season (spring: 2014-05-26, summer:2013-08-11, autumn:2013-10-14, winter:2014-01-02) were estimated by using the SEBAL model. The contributions of LUCC in 2000?2013 to the variation of ET were then analyzed. The results showed that: (1) compared to that in the year of 2000, the area of built-up land increased by 183.8%, while the areas of paddy rice field, dry land, woodland and water separately decreased by 19.1%, 10.7%, 12.8% and 9.5%. The main conversions between different land uses included paddy rice field→built-up land, dry land→built-up land, paddy rice field→dry land and dry land→paddy rice field, with the areas of 208, 168, 282 and 232km2, respectively. (2) Only with the regard to the impact of LUCC, the total daily ET at basin scale separately decreased by 13.4×105, 10.9×105, 6.0×105 and 0.5×105m3 in typical day of each season in 2013, when compared to that in 2000. In typical days of spring, summer and autumn, the positive contributions caused by the conversion from dry land to paddy rice field (16.8%, 16.3%, 5.7%, respectively) were overwhelmed by the negative contributions caused by the conversions from paddy rice field and dry land to the built-up land (-58.5%,-59.5%, -54.4% and -35.1%, -36.3%, -39.8%, respectively), which led to the decreased ET at basin scale. However, in the typical day of winter, the positive contribution caused by the conversion from dry land to paddy rice field (26.1%) was overwhelmed by the negative contributions caused by the conversions from paddy rice field to built-up land, dry land to built-up land and paddy rice field to dry land (-48.8%, -20.5%, -31.8%, respectively), which led to the decreased ET at basin scale. In a word, rapid urbanization in Qinhuai River basin caused the large-scale conversion from paddy rice field and dry land both with high ET to the built-up land with low ET, and then led to the decreased basin-scale ET in all seasons during 2000?2013.

Key words: Evapotranspiration, SEBAL model, Land use/cover change, Qinhuai River basin, Landsat satellite image

QIN Meng-sheng, HAO Lu, ZHENG Qing-zhou, JIN Kai-lun, SUN Ge. Contributions of Land Use/Cover Change to the Change of Evapotranspiration in Qinhuai River Basin[J]. Chinese Journal of Agrometeorology, 2019, 40(05): 269-283.

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