3.2 Statistical Analysis
Using the Mann-Kendall mutation test to detect the change-point year of data; using the Mann-Kendall trend method to detect whether the data series had trend change in time series(Mann 1945; Kendall and Gibbons 1990). Exert correlation analysis to investigate the relationship between water area and impact factor, which includes net outflow of the lake, sediment discharge, rainfall, and temperature. At last, the cross-tabulation matrix and change in terms of percent of the landscape to assess the total change of land categories(Pontius, Shusas, and McEachern 2004). Based on the image comparison results, discussing the characteristics and influencing mechanism of water area change in Poyang Lake.