摘要
基于土壤湿度和海洋盐度卫星(SMOS)土壤水分数据,采用时空均方根误差、趋势分析、重心迁移模型和相关分析方法,分析了松辽平原西部2010—2014年生长季地表土壤水分时空变化特征及影响因素.结果表明:研究区地表土壤水分呈东北高、西南低的空间分布格局,5年间平均地表土壤水分含量从0.110m^3/m^3增加到0.120m^3/m^3.扶余、大安、通辽、奈曼旗等地表层土壤水分空间变化显著.在不同年份,地表土壤水分随季节变化明显的地区不同.土壤水分重心向东北方向移动,迁移距离达30.809km.降水、植被覆盖因素均与地表土壤水分呈显著正相关,降水影响更强.在海拔小于200m或坡度为10°~20°的地区地表土壤水分相对较高,平均值分别为0.140,0.116m^3/m^3.黑土表层平均土壤水分更高,且具有明显的增长趋势.
Integrating soil moisture data from soil moisture and ocean salinity satellite （SMOS）, TRMM precipitation data, SPOT-VGT NDVI data, DEM and soil map, changes of surface soil moisture and the impact factors in the Western Songliao Plain during 2010--2014 were analyzed. The spatial and temporal root mean square error （RMSE）, trend analysis and distribution center migration model were used. The results indicated that surface soil moisture decreased from the northeast to the southwest spatially. The regional average surface soil moisture increased slightly by 0.01 m^3/m^3. The increasing trend accelerated from the south to the north. The distribution center moved towards the northeast with 30. 809 km. The greater spatial RMSE of soil moisture were found in Fuyu County, Tongliao City,Daan County and Naiman Banner etc. In different years, according to the values of temporal RMSE,the significant seasonal changes of soil moisture were found in different places. The positive correlation coefficients of surface soil moisture and precipitation were greater than those of NDVI. In the regions with the elevation lower than 200 m or 10°-20° slope, the average soil moisture was 0. 140 m^3/m^3 and 0. 116 m^3/m^3 ,respectively. Averaging surface soil moisture of black soil was highest with a significantly increasing trend.
出处
《东北师大学报（自然科学版）》
CAS
CSCD
北大核心
2017年第4期128-133,共6页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(41571405
41671379)
