Impacts of Climatic Change on Reference Crop Evapotranspiration across Different Climatic Zones of Ningxia at Multi-Time Scales from 1957 to 2018

Table 5

Trend analyses of ET₀ in different seasons over the NX, NYR, CAZ, and SMA.

Climate region	Season	ET0 tendency rate
		1957∼1990	1991∼2018	1957∼2018
NX (whole)	Spring	−5.74	4.64	2.78
	Summer	−3.96	3.50	1.55
	Autumn	−0.91	0.39	1.04
	Winter	−2.94	1.73	0.41
NYR	Spring	−6.35	4.48	5.45
	Summer	−5.03	3.49	3.19
	Autumn	−0.33	1.32	2.09
	Winter	−2.71	3.21	1.52
CAZ	Spring	−5.27	−5.02	−0.80
	Summer	−3.29	−2.58	−2.34
	Autumn	−1.38	−1.12	−0.82
	Winter	−3.09	−2.24	−0.55
SMA	Spring	−9.93	5.25	1.51
	Summer	−3.47	5.12	3.26
	Autumn	−1.65	1.46	1.24
	Winter	−1.49	2.72	0.92