Soil Moisture Inversion Of Degraded Grassland In Three Rivers Region Based On Remote Sensing

Using two kinds of remote sensing methods to invert soil moistureof degraded grassland in Maduo county in the region of three rivers,andanalyze the influence factors of soil moisture,the results showed that:(1)in the whole research area,when the span of vegetation coverage isgreat,there is no obvious correlation between soil moisture and NDVI,butin low vegetation coverage region,the correlation between soil moistureand NDVI is negative,soil water content decreases with the increase ofNDVI,the correlation coefficient of them is0.9198,P value is less than0.01,the relationship is significant at0.01level;（2） in the lowvegetation coverage region,there is obvious positive correlation betweensoil moisture and thermal inertia,soil moisture increases with the increaseof thermal inertia,in the three kinds of relationship models,the decisioncoefficient of linear model is highest,and the imitative effect is best,whentreat NDVI and thermal inertia as influence factors at the same time,thecorrelation coefficient of regression equation is0.938;(3) in the highvegetation coverage region， there is obvious negaitive correlationbetween soil moisture and temperature vegetation index,soil moisturedecreases with the increase of temperature vegetation index, thecorrelation coefficient of them is0.8966,P value is less than0.01,therelationship is significant at0.01level; in the three kinds of relationshipmodels,the decision coefficient of logarithm model is highest,and theimitative effect is best;(4) in diffienct solums between slopes andbeaches,the changement volatility of organic matteris great, there is noobvious change trend neither soil moisture nor organic matter,but soilmoisture increases with the increase of organic matter, there is obviouspositive correlation between them.in the swamp,the changment oforganic matter and soil moisture in different layer is great, there isobvious correlation between them,the content of organic at0-15cm ishigher than15-30cm;(5) the change trend of soil moisture is cloudyslope>sunny slope>slope valley>slope top,the soil moisture in sunnyslope and slope top at0-15cm is higher than15-30cm,while soil moisturein cloudy slope and slope valley at0-15cm is lower than15-30cm;(6) at0-15cm layer,there is no obvious change trend between soil moisture and altitude,but at an altitude of above a certain altitude,soil moisturedecreases with the increase of altitude.at15-30cm layer,soil moisture ishighest at an altitude about4320m,it increases with the increase of soilmoisture of altitude and decreases with the increase of altitude above4320m.