Barely Significant

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Over the reference period, modern contraceptive utilization showed an increasing trend, following the exponential smoothing equation, modern contraceptive utilization = 32.5 + 1.3 (coded year) − 0.099 (squared year code), with an R 2 value of 0.99 and a P value of 0.027, indicating that approximately 99% of the variability in modern contraceptive utilization can be explained by the trend (Table 5 ).
Within 2000–2020, taking five years as a period, it can be seen that cropland had the most significant decrease in 2005–2010, with a reduction of 150.5547 km 2 ; forest land had the most significant increase in 2005–2010, with a rise in 98.3547 km 2 ; construction land showed an increasing trend, with the most significant increase in 2010–2015, and the net transfer area of construction land was 72.2448 km 2 .
For the nonfrozen condition, the initial values of the exponential functions between the variation in the wind erosion rate and the wind speed of desert soil show an increasing trend, and the ratios of the functions decrease steadily; that is, with increasing moisture content, the degree of skewness of each function decreases, and the degree of influence of the wind speed on the wind erosion rate decreases.