Temporal-Spatial Characteristics and Future Changes of Temperature Extremes in Longtan Watershed Based on Multiple Indices

Table 3

Results of the extreme temperature trend test.

Index	Kendall’s rank correlation method	Spearman rank correlation method	Linear trend regression	Significance test	Trend	Interannual variability °C·(10a)^−1
TXx	2.99	3	2.81	Significant	Increase	0.14
TNn	4.39	4.98	4.66	Significant	Increase	0.37
DTR	4.58	5.29	5.97	Significant	Decrease	−0.12
SU25	3.42	3.61	3.56	Significant	Increase	2.4
FD	4.3	4.76	4.6	Significant	Decrease	−1.7
TX90p	4.3	4.66	4.88	Significant	Increase	1.1
TN90p	6.37	9.05	9.41	Significant	Increase	2.3
TX10p	1.14	1.17	1.19	Nonsignificant	Decrease	−0.2
TN10p	5.29	6.25	6.52	Significant	Decrease	−1.0
WSDI	4.27	4.61	4.49	Significant	Increase	1.9
CSDI	0.86	0.52	0.08	Nonsignificant	Decrease	−0.2