【摘要】 基于渭河流域2010—2015年MODIS NDVI时序数据集,采用GRC趋势分析法、植被覆盖度估算,分析2010—2015年渭河流域NDVI的变化趋势,并对2010和2015年植被覆盖度的时空格局进行分析。结果表明,2010—2015年,渭河流域NDVI均值呈缓慢增加趋势,仅增加了2.7%。渭河流域植被覆盖度总体呈现由西北向东南逐渐增加的趋势,高覆盖区仍集中分布在渭河谷地及延安南部。2010—2015年中高覆盖和高覆盖区面积分别增加3.2%、9.3%,中低覆盖和中覆盖区面积分别减少6.7%、5.9%。轻微改善区主要分布在天水地区,轻度退化区主要分布在秦岭北麓以及延安南部,明显退化区分布在六盘山南麓以及关中地区。更多还原

【Abstract】 Based on the 2010—2015 MODIS NDVI time series data sets of Wei River basin, the change trend of NDVI in Wei River basin from 2010 to 2015 as well as the spatial and temporal pattern of vegetation coverage in 2010 and 2015 by GRC trend analysis method and vegetation coverage estimation were analyzed. Results showed that the value of NDVI increased slowly in the Wei River basin during 2010—2015 with a growth rate of 2.7%. The vegetation coverage increased gradually from northwest to southeast, and the high coverage areas were still concentrated in Wei River valley and the south of Yan’an. From 2010 to 2015, the area of high-middle coverage and the high coverage increased by 3.2% and 9.3%, respectively; The area of middle and low-middle coverage was reduced by 6.7% and 5.9%, respectively. The minor improvement areas were mainly distributed in the Tianshui area, and the minor degradation areas were mainly distributed in the northern of Qinling Mountains and the southern of Yan’an, and the obvious degradation areas were distributed in the southern foot of Liupan Mountain and Guanzhong region.更多还原