攀枝花市烤烟土壤湿度空间分布反演研究

Study on the Spatial Distribution Inversion of Soil Moisture in Flue-cured Tobacco in Panzhihua City

[目的]为摸清攀枝花烟区土壤水分情况,以便为该区烤烟生产提供水分调控参考。[方法]结合2005-2010年该区气象观测点数据及2010年4-5月遥感监测数据,运用ArcGIS对攀枝花烟区的土壤湿度进行空间分布分析,并利用温度植被干旱指数(TVDI)反演该区土壤湿度时空分布。[结果]从时间上看,2010年2月19-28日研究区土壤温湿情况呈现较为干旱;从空间上看,仁和区总体上较盐边县、米易县干旱,盐边县和米易县个别乡镇具有地域差异性,红宝乡、格萨拉乡、白坡乡、麻陇乡大部分烟季土壤呈现较为湿润。[结论]总体上,用TVDI反演的土壤湿度时空分布特征与实际值较一致,从土壤水分角度考虑,攀枝花烟区在3月移栽烤烟较适宜,对于仁和区等相对干旱地区,建议推后移栽期,同时加大田间管理力度。

[Objective]To investigate the soil moisture conditions in Panzhihua tobacco area,in order to provide moisture control reference for flue-cured tobacco production in the area.[Method]Combining the meteorological observation point data of the area from 2005 to 2010 and the remote sensing monitoring data from April to May 2010,the spatial distribution of soil moisture in Panzhihua tobacco area was analyzed using ArcGIS,and the temperature and vegetation drought index(TVDI)was used to invert the temporal and spatial distribution of soil moisture in the area.[Result]In terms of time,the soil temperature and humidity in the study area was relatively dry from February 19 to 28,2010.From the perspective of space,Renhe District was generally drier than Yanbian County and Miyi County.Yanbian County and some towns in Miyi County had regional differences.Most of the tobacco season soils in Hongbao Township,Gsala Township,Baipo Township and Meilong Township were relatively moist.[Conclusion]In general,the spatial and temporal distribution characteristics of soil moisture inverted by TVDI are consistent with the actual value.Considering from the perspective of soil moisture,it is more appropriate to transplant flue-cured tobacco in Panzhihua tobacco area in March.For relatively dry areas such as Renhe area,it is suggested to delay the transplant period and strengthen field management.