Estimation Model of Soil Freeze-Thaw Erosion in Silingco Watershed Wetland of Northern Tibet

Table 1

Classification assignment of evaluation indices and their weights.

Index	Assignment criteria				Weight (𝑊𝑖)
Annual FT cycle days (day)	≤60	100–120	120–200	>200	0.15
Average diurnal phase-changed water content (%)	≤0.03	0.03–0.05	0.05–0.07	>0.07	0.15
Average annual precipitate (mm)	≤150	150–300	300–500	>500	0.05
Slope (°)	0–3	3–8	8–15	>15	0.35
Aspect (°)	0–45,	45–90,	90–135,	135–225	0.05
	315–360	270–315	225–270
Vegetation coverage (%)	60–100	40–60	20–40	0–20	0.25
Assigned value	1	2	3	4