2010—2018年辽宁西部地区植被覆盖变化及其对气候的响应

Variation of Vegetation Coverage and Its Response to the Climate in Western Liaoning from 2010 to 2018

基于SPOT/VEGETATION NDVI卫星遥感数据,通过分级制图、一元线性回归分析、统计制图等方法,分析2010—2018年辽宁西部地区植被覆盖时空演变特征,并结合气候因子,针对降水量研究其对植被影响的滞后性。结果表明:辽西地区的植被覆盖总体呈现从西北向东南逐渐递增的趋势,与其降水时空分布不均等气候特点有一定关系;由于该地区气象干旱频发,植被覆盖波动较大,但整体呈下降趋势,降速为-0.8485/a;植被长势与当月、前一月的降水量基本吻合,滞后效应不明显,但可以确定如果在当月和前一月保证充足降水,能有效地促进植被生长。

Based on spot/VEGETATION NDVI data,the spatio-temporal evolution characteristics of vegetation coverage in western Liaoning from 2010 to 2018 are analyzed by graded mapping,unitary linear regression analysis,and statistical mapping.In combination with climate factors,its hysteresis effect on vegetation is studied in view of precipitation.The results show that the vegetation coverage in western Liaoning shows a gradual increase from northwest to southeast,which has some relationship with the uneven distribution of precipitation in the climate;Due to the frequent meteorological drought,vegetation coverage fluctuates greatly,however,the overall trend is decreasing with the rate of-0.8485 per year;Vegetation growth is in coincidence with the precipitation and the hysteresis effect is not obvious.However,it can be determined that adequate precipitation during the current month and the previous month will effectively promote vegetation growth.