陕西省近年NDVI变化及其与气候因子相关性分析

NDVI change with climate factors in Shaanxi province during recent years

通过对陕西省1982年-2003年植被的动态变化及降水、温度的年际变化趋势及相互关系的时空变化规律分析,22年间陕西省植被总体呈增加趋势,植被面积约增加了0.2%,春秋两季植被增加趋势最为明显。植被变化与气温的相关性大于与降水的相关性,植被变化与后滞一月降水的相关性大于与同期降水的相关性。气温升高引起的植被生长期的提前和生长季节的延长导致植被的增加,地理差异和人为因素也对植被变化产生影响。陕北低植被覆盖地区的植被覆盖度面积有所上升;陕南高植被覆盖区的植被覆盖面积有所下降,使得整个区域的中植被覆盖度上升。

By analyzing the spatial-temporal correlations of vegetation change with precipitation and temperature in Shaanxi province during 1982—2003.The results showed that vegetation cover increased 0.2%,which is consist with the greening trend,the greening pattern in spring and autumn is prevalent.The correlation between vegetation cover change and temperature is more significant than precipitation,the correlation between vegetation cover change and after the stagnation of precipitation is more significant than the same period of precipitation.Temperature leads the vegetation cover change to driving.The observed changes in vegetation cover result from the combined effects of land management and climate.Land management and climate change may interact in their joint effects on productivity.Human activities and geographic differences also made a contribution to vegetation cover change.The vegetation cover areas of Northern Shaanxi province are rising;The vegetation cover areas of Southern Shaanxi province are dropping,the coverage vegetation cover is little rising.