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中文摘要：
基于1998—2011年的SPOT VGTNDVI数据，运用最大化均值法、提取植被覆盖度法和一元线性回归趋势分析法，对甘肃河东地区连续14 a的植被覆盖时空变化特征进行动态研究。结果表明：河东地区植被南多北少。在时间上，整体植被呈缓慢上升趋势，增速为0.028·（10a）^-1。其中，前4 a NDVI呈下降趋势，从1998年的0.392下降到 2001年0.314；后10 a NDVI呈波动上升趋势，从2002年的0.330上升到2011年的0.378。在空间上，陇南山区中北部、陇中高原南部植被呈增加趋势；而陇东高原东南部、甘南草原区则有所下降。
英文摘要：
Based on the SPOT VGT-NDVI data during the period from 1998 to 2011, in this paper the spatial and temporal variation of vegetation coverage in the Hedong region of Gansu Province was systematically studied using the NDVI average method, retrieval of vegetation coverage and linear regression trend analysis. The results show that the NDVI in the north of the Hedong region was lower than that in the south. Temporally, NDVI in the study ar- ea in recent 14 years was holistically in an increase trend with an increase rate of 0.028·（10a）^-1. In which it was decreased in the first 4 years （from 0. 392 in 1998 to 0.314 in 2001 ） ; in the later 10 years, it was increased in a fluctuation way （from 0.330 in 2002 to 0.378 in 2011 ）. Temporally, NDVI in recent 14 years was in an in- crease trend in the northern-central mountainous region in south Gansu Province, southern parts of the central Gan- su Plateau, but it was in a certain decrease in the southeast of the east Gansu Plateau and the grasslands in south Gansu Province.
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