A Study Of The Relationship Between Hydroclimatic Factor And Surface Environment In Horqin Sandy Land

The study site is located in Horqin sandy land.In this site we investigated local ecological environment and surface plant situation, as same time, collected hydrometecrological information and tree-ring specimen which we made laboratory investigations form June to November in 2002. In the foundation we analyzed the local flora and classed them, which made us to understand local natural resources and resources situation of plants, and suggested fact that environment of this area is deteriorating; We analyzed correlation between plant ecology and depth of groundwater, from this we could find their relations and detect transition range of depth of groundwater of ecological environment of different plant, we diagnoses different species in different space, which can reach a conclusion that in this area tree-ring of Polar, Willow and Elm are increasing with the latitude ,in other words, tree-ring index are increasing with the elevation; We analyzed the correlation between the corresponding hydro climatic factor and different tree species of different space and time, we can find that the growth of Polar and Willow are increasing with the amount of precipitation and air temperature, the general tendency of growth are decline in selected time phase, but the growth of Willow are increasing with the amount of evaporation and the temperature, the general tendency of growth are incensement in selected time phase, At the last, from the analysis of correlation we suggested that the growth of Elm are decreasing with depth of groundwater. In consideration of fairly good correlation between annual precipitation and chronology of the Elm in Lubei area, we reconstruct annual precipitation of chronology of extending 46 years. Final, we analyzed of correlations between sandstorm and tree-ring and precipitation, we can find that sandstorm are decreasing with precipitation, tree-ring index are increasing with precipitation.