摘要
基于改进的空间要素插值方法,使用DEM海拔高程数据作为修正,在要插值的空间数据与协同因子之间的相关性较高时,可以有效地提高插值结果的精度。对于年积温数据,其与DEM海拔高程之间的相关系数为0.769,相关性较高,故使用DEM的协克里格方法可以有效地提高插值精度,4种插值方法的ME值排序为IDW<Spline<OK<CK。相比较OK法,CK法的插值精度提高了35%以上,故使用CK法对年积温空间数据库进行插值;对于年降水数据,其与DEM海拔高程之间的相关系数为0.372,相关性较低,故使用DEM的协克里格插值方法并不能有效地提高插值精度,4种插值方法的ME值排序为IDW<Spline<CK<OK。OK法的插值精度最高,故使用OK法对年降水数据进行插值。在插值结果的基础上,利用GIS软件的叠加分析功能,计算出了甘肃省的湿润度K值空间数据库,依据草原综合顺序分类法的水热标准,对甘肃省草地类型的划分进行了初步的研究,并制作了甘肃省草地类型分布图。研究结果显示,甘肃省草地分为18个类,横跨了从寒冷到暖热5个热量级,极干到潮湿6个湿润度级。自陇东南向西北形成了森林-森林草原-典型草原-荒漠草原-草原化荒漠-半荒漠-荒漠等植被类型。山地系列自上而下,形成高山-亚高山-草甸-山地森林-草甸草原-典型草原等植被类型,基本上反映了甘肃天然草地发生规律和分布规律,并为后续的相关研究提供了理论基础。
Based on improved spatial interpolation method, DEM data was used as cofactor, when the correlativity between the cofactor and the spatial data was relatively high, the precision of interpolation could be increased effectively. For the annual accumulated temperature data, the correlation coef fieient between DEM elevation and the annual accumulated temperature was 0. 769, and the relativity was high, so the precision of interpolation can be increased effectively with DEM elevation. The ME of four interpolation methods in turn are. IDW〈Spline〈OK〈CK, comparing with the Ordinary Kriging method, the interpolation precision of Co-kriging method had a significant increasing from 1. 861 to 1. 169, a 35% raising, hence used the CK method to generate the annual accumulated temperature spatial database. For the annual average precipitation data, the correlation coefficient between DEM elevation and the annual average precipitation was 0. 372, relati cision of interpolation can not be increased effectively with DEM elevation. vlty The was low, and the pre ME of four interpola tion methods in turn are： IDW〈Spline〈CK〈OK, the OK method had highest interpolation precision, accordingly used the OK method to create the annual average rainfall spatial database. Based on the interpolation results and the standards of integrated classification system, with the map overlay a nalysis function of GIS software, the moisture index （K） spatial database and the distribution map of grassland types of Gansu province were regenerated. From this map, it can be seen that there are to tally 18 grassland types in Gansu province, bestriding 5 heat levels from cold to warm and hot, 6 humidity grades levels from extreme arid to humid. Formed several vegetation cover types which are for est, forest-steppe, typical steppe, desert-steppe, semi-desert and desert from southeast to northwest of Gansu, and alpine, sub-alpine, foot of mountain. The disciplines of reflected basically, and useful basic meadow, mountainous forest and meadow steppe from hilltop to genesis and distribution of native grassland of Gansu province was theory was provided for continuous study.
出处
《草业科学》
CAS
CSCD
北大核心
2009年第5期7-13,共7页
Pratacultural Science
基金
"863"计划数字农业技术课题(2006AA10Z241)
关键词
GIS
综合顺序分类法
空间插值
天然草地类型
GIS~ comprehensive and sequential classification
spatial interpolation
native grassland types
