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In addition, the trends in DFAA events in each sub-tributary of the Poyang Lake catchment were also examined based on the M-K test. Table 2 shows the results of the M-K tests of DFAAI at each hydrological gauging station in March, April, July, and August, respectively. It is seen that although the increasing trends can be observed at most stations with positive M-K statistics in March, including a significant trend at the 5% significance level at Qiujin, the Gangjiang and Fuhe Rivers show slight decreasing trends. Moreover, the downward trends are also presented in April with negative M-K statistics in every river; however, none exceeds the 5% significance level. By contrast, the DFAAI values in July and August display slight upward trends at all stations, with positive Z-statistics, except at Qiujin station in July and Dufengkeng station in August; however, most are not significant. Table 2 indicates that the intensity of DFAA, both the drought-to-flood and the flood-to-drought, in the Poyang Lake catchment has an alleviative tendency during the last few decades.

Table 2

Long-term trends of DFAAI for five sub-tributaries in March, April, July, and August

StationSub-tributaryMarchAprilJulyAugust
Waizhou Ganjiang River −0.35 −0.35 0.37 0.33 
Meigang Xinjiang River 0.69 −0.25 0.64 0.56 
Lijiadu Fuhe River −0.09 −1.13 0.58 0.50 
Shizhenjie Raohe River (south) 1.08 −1.63 0.61 0.71 
Dufengkeng Raohe River (north) 0.02 −1.39 2.04* −1.16 
Wanjiabu Xiushui River (south) 0.48 −0.95 0.85 0.76 
Qiujin Xiushui River (north) 2.17* −1.94 −1.19 0.71 
Total  −0.31 −0.89 0.63 0.64 
StationSub-tributaryMarchAprilJulyAugust
Waizhou Ganjiang River −0.35 −0.35 0.37 0.33 
Meigang Xinjiang River 0.69 −0.25 0.64 0.56 
Lijiadu Fuhe River −0.09 −1.13 0.58 0.50 
Shizhenjie Raohe River (south) 1.08 −1.63 0.61 0.71 
Dufengkeng Raohe River (north) 0.02 −1.39 2.04* −1.16 
Wanjiabu Xiushui River (south) 0.48 −0.95 0.85 0.76 
Qiujin Xiushui River (north) 2.17* −1.94 −1.19 0.71 
Total  −0.31 −0.89 0.63 0.64 

*Delineates significance at 0.05 significance level.

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