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Fig 3 - Effects of climate and land use/cover changes on soil loss in the Three Gorges Reservoir area, China

Fig. 3. Spatial variation of soil loss in the TGR area between 2001 and 2015. Average (a) and the modelled slope (b) of actual annual soil loss rate, and p value of t test for the slope (c) and the changes of soil loss risk (d). Note: To reveal the soil loss risk, soil loss rate was further classified into six levels according to the Technological Standard of Soil and Water Conservation (SL190-2007, issued by the Ministry of Water Resources of China): slight level (<5 t•ha -1 •yr -1 ), low level (5~25 t•ha -1 •yr -1 ), moderate level (25~50 t•ha -1 •yr -1 ), high level (50~80 t•ha -1 •yr -1 ), very high level (80~150 t•ha -1 •yr -1 ), and severe level (>150 t•ha -1 •yr -1 ). In the figure (d), no change documents that annual soil loss rate did significantly no change (slope = 0), and significant increase refers to slope > 0 and p < 0.05, while significant decrease refers to slope < 0 and p < 0.05.
Spatial variation of soil loss in the TGR area between 2001 and 2015. Average (a) and the modelled slope (b) of actual annual soil loss rate, and p value of t test for the slope (c) and the changes of soil loss risk (d). Note: To reveal the soil loss risk, soil loss rate was further classified into six levels according to the Technological Standard of Soil and Water Conservation (SL190-2007, issued by the Ministry of Water Resources of China): slight level (<5 t•ha -1 •yr -1 ), low level (5~25 t•ha -1 •yr -1 ), moderate level (25~50 t•ha -1 •yr -1 ), high level (50~80 t•ha -1 •yr -1 ), very high level (80~150 t•ha -1 •yr -1 ), and severe level (>150 t•ha -1 •yr -1 ). In the figure (d), no change documents that annual soil loss rate did significantly no change (slope = 0), and significant increase refers to slope > 0 and p < 0.05, while significant decrease refers to slope < 0 and p < 0.05.
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