基于植被指数的内蒙古植被生态系统的时空变化分析

Temporal and Spatial Analysis on Plant Ecosystems Assessed by Vegetation Index in Inner Mongolia during 1998～2011

基于14年的SPOT NDVI影像,分析了内蒙古1998～2011年生长季植被覆盖度、NDVI的回归系数及其显著性概率,结果表明:①内蒙古自治区植被覆盖度由西南向东北逐渐增大,近年来高值区缩小,低值区东进扩张;②呼伦贝尔中、东部地区,赤峰南部、东南部,通辽中、南部和鄂尔多斯等地区植被增长显著;兴安盟、通辽、赤峰境内部分地区,乌兰察布中、东部地区NDVI降低趋势较明显;③黑河流域内蒙段植被指数增长显著,但覆盖度很低;④锡林郭勒植被指数在1998～2011年间下降了18.9%,空间分布变化剧烈。

Using SPOT NDVI（Normalized Differential Vegetation Index） images acquired during growing season in 1998-2011 in Inner Mongolia,pixel-by-pixel regression coefficient and significance,calculated vegetation coverage over the study area are analyzed.The results are as follows： 1） vegetation coverage in Inner Mongolia increased from southwest to northeast;high coverage region contracted,but the low value region expanded in recent years;2） significant growth region located in the central and eastern Hulunbeir,the southern and southeast corner of Chifeng,the central and southern region of Tongliao,the most part of Ordos,the segment of the Heihe River in Inner Mongolia,but vegetation coverage was very low in the last region;at the same time,there were significant reduction in part of Xing’an,Tongliao,Chifeng and the central and eastern Wulanchabu.At last,violent change of NDVI in Xilinguole,decreased by 18.9% from 1998 to 2011 is found.