4.2.2 Changes of Sediment in Poyang Lake.
From 1980 to 2020, the summation sediment of ’five rivers’ has a
significant downward trend (Fig 7), the decrease rate being
−33.5km2/a (MK trend test Z=-1.67, passing the 95%
test), but the change point does not significant. Pearson analysis tests
the correlation between annual sediment and area in two seasons. The
result showed that the coefficient in the flood season area is 0.29, and
the coefficient in the dry season area is 0.25. Both are at the 95%
confidence level. Demonstrating that lake area and sediment have an
associative relation.