Effects of different land use types on potential evapotranspiration in the Beijing-Tianjin-Hebei region, North China

doi:10.1007/s11442-019-1637-7

Abstract

Abstract:

Potential evapotranspiration (ET₀) is vital for hydrologic cycle and water resource assessments as well as crop water requirement and irrigation demand assessments. The Beijing-Tianjin-Hebei region (Jing-Jin-Ji)-an important, large, regional, economic community in China has experienced tremendous land use and land cover changes because of urbanisation and ecological restoration, affecting the hydrologic cycle and water resources of this region. Therefore, we analysed ET₀ in this region using climate data from 22 meteorological stations for the period 1991-2015 to understand this effect. Our findings show that ET₀ increased significantly at a rate of 7.40 mm per decade for the region. Based on the major land use type surrounding them, the meteorological stations were classified as urban, farmland, and natural stations using the 2015 land use dataset. The natural stations in the northern mountainous area showed a significant increase in ET₀, whereas most urban and farmland stations in the plain area showed a decrease in ET₀, with only a few of the stations showing an increase. Based on the different ET₀ trends for different land use types, these stations can be ranked as follows: urban stations (trend value: -4.663 to -1.439) > natural stations (trend value: 2.58 to 3.373) > farmland stations (trend value: -2.927 to -0.248). Our results indicate that land use changes affect meteorological parameters, such as wind speed and sunshine duration, which then lead to changes in ET₀. We noted that wind speed was the dominant parameter affecting ET₀ at all the natural stations, and wind speed and sunshine duration were the dominant parameters affecting ET₀ at most of the urban stations. However, the main controlling parameters affecting ET₀ at the farmland stations varied. These results present a scope for understanding land use impact on ET₀, which can then be applied to studies on sustainable land use planning and water resource management.

Key words: land use, potential evapotranspiration, meteorological parameters, water resource management, Jing-Jin-Ji region

Jingyan HAN, Yong ZHAO, Jianhua WANG, Bing ZHANG, Yongnan ZHU, Shan JIANG, Lizhen WANG. Effects of different land use types on potential evapotranspiration in the Beijing-Tianjin-Hebei region, North China[J].Journal of Geographical Sciences, 2019, 29(6): 922-934.

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Station No.	Station	Latitude (°N)	Longitude (°E)	Elevation (m)	Dominant land use type
53399	Zhangbei (ZB)	41.15	114.70	1393.3	Farmland
53593	Yuxian (YX)	39.83	114.57	909.5	Farmland
53698	Shijiazhuang (SJZ)	38.03	114.42	81.0	Urban
53798	Xingtai (XT)	37.07	114.50	77.3	Urban
54308	Fengning (FN)	41.22	116.63	661.2	Natural
54311	Weichang (WC)	41.93	117.75	842.8	Natural
54401	Zhangjiakou (ZJK)	40.78	114.88	724.2	Urban
54405	Huailai (HL)	40.40	115.50	536.8	Farmland
54423	Chengde (CD)	40.98	117.95	385.9	Natural
54429	Zunhua (ZH)	40.20	117.95	54.9	Urban
54436	Qinglong (QL)	40.40	118.95	227.5	Natural
54449	Qinhuangdao (QHD)	39.85	119.52	2.4	Urban
54511	Beijing (BJ)	39.80	116.47	31.3	Urban
54518	Langfang (LF)	39.12	116.38	9.0	Farmland
54527	Tianjin (TJ)	39.08	117.07	2.5	Urban
54534	Tangshan (TS)	39.67	118.15	27.8	Urban
54539	Laoting (LT)	39.43	118.88	10.5	Farmland
54602	Baoding (BD)	38.85	115.52	17.2	Urban
54606	Raoyang (RY)	38.23	115.73	19.0	Farmland
54623	Tanggu (TG)	39.05	117.72	4.8	Urban
54624	Huanghua (HH)	38.37	117.35	6.6	Farmland
54705	Nangong (NG)	37.37	115.38	27.4	Farmland