基于C值和>5℃积温的内蒙古自治区植被-气候分类

Vegetation-climate classification in Inner Mongolia based on C value and >5 ℃ accumulated temperature

C值是崔启武(1981)提出的一个水热联系方程的参数,代表了一个地区的干湿状况。本研究根据150个气象站点资料,计算了内蒙古自治区1961—1990年30年平均C值和>5℃积温,并生成空间分布图。结合内蒙古自治区植被地带分布图,绘制了内蒙古10个植被地带的C值和>5℃积温的散点图,较好地表现了内蒙古各植被带与气候指标的关系,并确定了内蒙古各植被带的C值和>5℃积温的界限。根据确定的各个植被带的C值和>5℃积温的界限,模拟了内蒙古自治区植被带的空间分布。通过Kappa一致性检验结果表明,C值与>5℃积温结合可以较好地反映内蒙古植被地带的空间分布状况。作为一个综合气候指标,C值为模拟内蒙古植被带分布提供了重要信息。

C value is a parameter of the water-heat correlative equation proposed by Qiwu Cui（1981）,which characterizes the dryness or wetness of a region.Based on the observation data from 150 weather stations in Inner Mongolia in 1961-1990,this paper calculated the mean annual C value and 〉5 ℃ accumulated temperature（AT5） over the 30-year period in this region,and spatially interpolated them into raster grids with 8 km resolution by Kriging.In combining with the map of vegetation regionalization,a scatter plot map of C value and AT5 for ten vegetation zones in Inner Mongolia was produced,which better reflected the relationships between the vegetation zones and climatic indices in Inner Mongolia.The ranges of C value and AT5 for each vegetation zone were determined.According to the determined C value and AT5,the spatial distribution of the vegetation zones in Inner Mongolia was simulated.Kappa test showed that C value combined with AT5 could better reflect the spatial distribution of vegetation zones in Inner Mongolia.As a comprehensive climatic index,C value could provide important information for simulating the distribution of vegetation zones in Inner Mongolia.