Spatial and Temporal Variation Characteristics and Attribution Analysis of Potential Evapotranspiration in Hulunbuir 1961-2018

doi:10.11924/j.issn.1000-6850.casb20200100039

Abstract

Abstract:

The purpose of this article is to study the spatiotemporal variation of potential evapotranspiration over the past 58 years, and provide a basis for the research on meteorological ecology in Hulunbuir. Based on the observation data of 16 meteorological stations in Hulunbuir from 1961 to 2018, the spatial and temporal variation characteristics and causes of potential evapotranspiration in the 58 years were analyzed from seasonal and decadal scales by means of trend analysis, M-K mutation test and partial correlation coefficient. The results showed that: (1) from 1961 to 2018, the annual average potential evapotranspiration changes in Hulunbuir ranged from 320 to 771 mm, and the overall trend was increasing from northeast to southwest and southeast; the average potential evapotranspiration was the highest in summer, followed by that in spring and autumn, and the lowest was in winter; (2) the annual average potential evapotranspiration increased at a rate of 2.3 mm/a, and it had a mutation in 1998, after which the increase trend became more obvious; (3) the increase trend in grassland areas in the southwest and agricultural areas in the east was significantly higher than that in the Great Khingan Mountains forest zone; (4) the variation of potential evapotranspiration in Hulunbuir was negatively correlated with wind speed, vapor pressure and relative humidity, and positively correlated with average air temperature and air pressure; the main factors affecting annual potential evapotranspiration were relative humidity and average temperature. Combining with the potential trend of evapotranspiration, the rational planning of water resources is of great significance to the ecological environment assessment and environmental change in this area.

Key words: Hulunbuir, meteorological ecology, potential evapotranspiration, temporal and spatial variation, influence factor

CLC Number:

S161.9

Liu Hao, Wang Haimei. Spatial and Temporal Variation Characteristics and Attribution Analysis of Potential Evapotranspiration in Hulunbuir 1961-2018[J]. Chinese Agricultural Science Bulletin, 2020, 36(36): 58-66.

Figures/Tables 10

References 26

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时期	风速	平均气温	水汽压	气压	相对湿度
全年	-0.384^*	0.503^*	-0.224^*	0.089	-0.857^*
春季	-0.253^*	0.706^*	-0.152	0.312^*	-0.801^*
夏季	-0.134	0.741^*	-0.427^*	0.237^*	-0.978^*
秋季	-0.276^*	0.496^*	-0.378^*	0.123	-0.913^*
冬季	-0.161	0.203^*	0.016	0.066	-0.484^*

时期	风速	平均气温	水汽压	气压	相对湿度
全年	-0.384^*	0.503^*	-0.224^*	0.089	-0.857^*
春季	-0.253^*	0.706^*	-0.152	0.312^*	-0.801^*
夏季	-0.134	0.741^*	-0.427^*	0.237^*	-0.978^*
秋季	-0.276^*	0.496^*	-0.378^*	0.123	-0.913^*
冬季	-0.161	0.203^*	0.016	0.066	-0.484^*

	经度	纬度	平均风速(v)	平均气温(t)		相对湿度(r)		水汽压(s)		气压(q)	前3个因子
额尔古纳右旗	120.183	50.25	-0.024	0.464^*		-0.848^*		-0.28^*		0.243^*	r\t\s
根河	121.517	50.783	-0.227^*	0.578^*		-0.848^*		0.173^*		0.202^*	r\t\v
图里河	121.683	50.483	0.03	0.460^*		-0.605^*		0.229^*		0.279^*	r\t\q
鄂伦春	123.733	50.583	-0.247^*	0.5311^*		-0.842^*		-0.062		0.092	r\t\v
满洲里	117.433	49.567	0.105	0.447^*		-0.141		-0.096		-0.064	t\r\v
陈巴尔虎旗	119.3	49.32	-0.367^*	0.473^*		-0.822^*		-0.345^*		0.143^*	r\t\v
鄂温克	119.63	48.9	0.088	0.412^*		-0.854^*		-0.49^*		-0.074	r\s\t
牙克石	120.7	49.283	-0.018	0.118	-0.144		-0.101		-0.092		r\t\q
海拉尔	119.6	49.2	0.315^*	0.496^*	-0.818^*		-0.41^*		-0.494^*		r\t\q
小沟	123.717	49.2	0.314^*	0.504^*	-0.87^*		-0.047		-0.049		r\t\v
新巴尔虎右旗	116.817	48.667	-0.018	0.447^*	-0.754^*		-0.576^*		-0.204^*		r\s\t
新巴尔虎左旗	118.267	48.217	-0.48^*	0.381^*	-0.551^*		-0.444^*		-0.009		r\v\t
博克图	121.917	48.767	0.031	0.556^*	-0.744^*		-0.318^*		0.125		r\t\s
扎兰屯	122.733	48	-0.473^*	0.571^*	-0.82^*		-0.46^*		0.092		r\t\v
莫力达瓦	124.483	48.467	0.255^*	0.213^*	-0.743^*		-0.391^*		-0.232^*		r\s\v
阿荣旗	123.483	48.117	-0.14*	0.586^*	-0.536^*		-0.234^*		-0.615^*		q\r\t

	经度	纬度	平均风速(v)	平均气温(t)		相对湿度(r)		水汽压(s)		气压(q)	前3个因子
额尔古纳右旗	120.183	50.25	-0.024	0.464^*		-0.848^*		-0.28^*		0.243^*	r\t\s
根河	121.517	50.783	-0.227^*	0.578^*		-0.848^*		0.173^*		0.202^*	r\t\v
图里河	121.683	50.483	0.03	0.460^*		-0.605^*		0.229^*		0.279^*	r\t\q
鄂伦春	123.733	50.583	-0.247^*	0.5311^*		-0.842^*		-0.062		0.092	r\t\v
满洲里	117.433	49.567	0.105	0.447^*		-0.141		-0.096		-0.064	t\r\v
陈巴尔虎旗	119.3	49.32	-0.367^*	0.473^*		-0.822^*		-0.345^*		0.143^*	r\t\v
鄂温克	119.63	48.9	0.088	0.412^*		-0.854^*		-0.49^*		-0.074	r\s\t
牙克石	120.7	49.283	-0.018	0.118	-0.144		-0.101		-0.092		r\t\q
海拉尔	119.6	49.2	0.315^*	0.496^*	-0.818^*		-0.41^*		-0.494^*		r\t\q
小沟	123.717	49.2	0.314^*	0.504^*	-0.87^*		-0.047		-0.049		r\t\v
新巴尔虎右旗	116.817	48.667	-0.018	0.447^*	-0.754^*		-0.576^*		-0.204^*		r\s\t
新巴尔虎左旗	118.267	48.217	-0.48^*	0.381^*	-0.551^*		-0.444^*		-0.009		r\v\t
博克图	121.917	48.767	0.031	0.556^*	-0.744^*		-0.318^*		0.125		r\t\s
扎兰屯	122.733	48	-0.473^*	0.571^*	-0.82^*		-0.46^*		0.092		r\t\v
莫力达瓦	124.483	48.467	0.255^*	0.213^*	-0.743^*		-0.391^*		-0.232^*		r\s\v
阿荣旗	123.483	48.117	-0.14*	0.586^*	-0.536^*		-0.234^*		-0.615^*		q\r\t