Advances in Meteorology / 2015 / Article / Tab 2

Research Article

Effects of Climate Change and Human Activities on Surface Runoff in the Luan River Basin

Table 2

The Mann-Kendall test statics slope () and changes of annual precipitation, potential evapotranspiration (PET), and observed runoff during the pretreatment period and testing period.

Pretreatment
period (mm)
Testing
period (mm)
Difference
(mm)
Ratio
(%)

Precipitation−1.26504.61442.00−62.61−12.40
PET−1.79886.40871.34−15.06−1.70
Observed runoff−2.29103.3116.01−87.30−84.50

In a two-side test, when accepts a null hypothesis, or when < − indicates a decreasing trend, and when > indicates an increasing trend, is the significance level. In this study, is set to be 0.05 and the corresponding value of is 1.96 [27, 28].