摘要
在草地综合顺序分类系统(IOCSG)的指导下,以甘肃省113个气象站点多年>0℃年积温(Σθ)和年降水量(r)以及DEM数据为主要数据源,采用"多元回归+残差分析法(AMMRR)"进行气象数据空间化,通过空间叠置分析完成甘肃省草地类的划分。研究结果表明,甘肃省共有28个IOCSG草地类,面积最广的有4个,分别是微温极干温带荒漠类(ⅢA3)、微温干旱温带半荒漠类(ⅢB10)、微温湿润落叶阔叶林类(ⅢE31)和寒冷潮湿高山草甸类(ⅠF36),分别主要分布在北山山地、河西走廊、黄土高原和甘南高原;亚热带的几个类(ⅤB12、ⅤC19、ⅤD26和ⅤE33)分布面积较小,比例不足1%。研究结果符合甘肃省各区域的气候特点。AMMRR法充分考虑了地形因子(经度、纬度和海拔高度)对气象要素的影响,使Σθ和r插值结果更接近实际,得到的草地分类图也充分体现出了植被的地带性规律,模拟效果较好。
Under the guidance of Integrated Orderly Classification System of Grassland（IOCSG）,interpolation methods of Analytic Method based on Multiple Regression and Residues（AMMRR）,in conjunction with DEM and meteorological data as main data source including annual accumulative temperature（Σθ）,annual precipitation（r） of 113 stations in Gansu Province,were applied in spatial interpolation.Then the grassland classes in Gansu were classified through spatial overlay analysis.The results showed that the grasslands could be classified into 28 classes in whole province.Four classes with the largest area,i.e.ⅢA3（Cool temperate-extrarid temperate zonal desert）,ⅢB10（Cool temperate-arid temperate zonal semidesert）,ⅢE31（Cool temperate-humid forest steppe,deciduous broad leaved forest） and ⅠF36（Frigid perhumid rain tundra,alpine meadow）,were distributed in north mountains,Hexi Corridor,Loess Plateau and Gannan Plateau.Meanwhile,four classes located in subtropics had the smallest area accounting for less 1%.The results also showed that the distribution of grassland classes fitted to the climatic characteristics of regions in Gansu.The interpolation of Σθ and r was closer to reality and the map of grassland classes could fully reflect the zonal patterns of grassland vegetation distribution,which proves that the AMMRR method has a better simulative result because the effect of topographic factors（longitude,latitude and elevation） to climatic factors was covered.
出处
《草业科学》
CAS
CSCD
北大核心
2012年第3期384-391,共8页
Pratacultural Science
基金
国家自然科学基金(30960264)
甘肃省科技支撑计划-农业计划(0804NKCA071)
