【作者】 马龙；

【导师】 刘廷玺；

【作者基本信息】 内蒙古农业大学 ， 农业水土工程， 2004， 硕士

【摘要】 本文以科尔沁沙地为研究区，于2002.6～2002.11月间进行了野外生态环境与地表植被状况的实地调查、树木年轮标本采集和室内实验，同时收集了相关的水文气象信息。在此基础上，对科尔沁沙地植物区系进行了分析归类，基本摸清了当前科尔沁沙地自然环境状况和植物资源状况，并揭示出该地区环境日趋恶化的事实；通过对植物生态型与地下水埋深的相关分析，找出了植物生态型与地下水埋深的对应关系，并分析得出不同类型植物所处生境下地下水埋深的过渡范围；通过对不同空间上的不同树种同纬度均值随纬度变化的分析，得知该地区杨树、榆树和柳树年轮指数随纬度的增大总体上趋于增大，对于该地区而言即为年轮指数随高程的增加而增大；经对不同空间不同时间尺度不同树种年轮指数与其对应的水文气象因子的相关分析，发现杨树、榆树生长量随降水量的增大和温度的升高而增大，并且生长量在所设的时间尺度上总体是趋于减少的，而柳树的生长量则随蒸发量的增大和温度的升高而增大，生长量在所设的时间尺度上总体是趋于增加的；通过相关分析得出榆树生长量随地下水埋深的加大而减少。鉴于鲁北地区年降雨量与榆树年表具有较好的相关性，对鲁北地区的年降雨量进行了重建，延展了该地区46年的年降雨量资料。最后，分析了沙尘暴和树木年轮与降水量的对应关系，发现随着降水量的增大，沙尘暴发生次数随之减少，而年轮指数则随之增大。更多还原

【Abstract】 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.更多还原