应用高分卫星遥感数据评价紫花苜蓿人工草地返青状况

利用国产GF-2和GF-6高空间分辨率卫星遥感图像,以内蒙古阿鲁科尔沁旗为研究区,结合实地调查,评价苜蓿人工草地返青状况。结果表明:(1)依据样地观测数据,发现植被覆盖度与苜蓿植株高度、株数均呈现出极显著的正相关关系,为此提出了基于植被覆盖度的苜蓿人工草地返青状况评价指标;(2)建立了苜蓿人工草地返青期垂直植被指数(Perpendicular vegetation index,PVI)模型,实现了基于PVI反演植被覆盖度;(3)对2019年调查的喷灌圈内苜蓿人工草地返青状况进行了评价,返青状况好、中、差的面积分别是130.2hm²、475.7hm²和106.9hm²,中等及中等以上返青等级的面积占85.00%,表明2019年当地苜蓿人工草地返青状况总体良好。

Evaluation of Resume Growth in Alfalfa Artificial Grassland by High-resolution Satellite Remote Sensing Data

Emotely sensed images captured by China-made high spatial resolution satellite GF-2 and GF-6 integrated with field observations were used to evaluate the resume growth in alfalfa artificial grassland in Ar Horqin Banner,Inner Mongolia.The results showed that there was a significant positive correlation between vegetation coverage and plant height and number of alfalfa according to the observed field data,which brought up evaluation indicators of resume growth in alfalfa artificial grassland based on vegetation coverage.Furthermore,the perpendicular vegetation index(PVI)model for alfalfa artificial grassland was established during the resume growth stage,which simulated the vegetation coverage.At last,the resume growth within sprinkler irrigation range in alfalfa artificial grassland in 2019 was evaluated that fully,moderately and poorly resume growth areas were 130.2hm²,475.7hm²,and 106.9hm²,respectively.Fully or moderately resume growth areas accounted for 85%of the total artificial grassland,suggesting that the resume growth was overall good in this area in 2019.In conclusion,this study provided technical support for prompt and accurate understanding of the resume growth status of alfalfa artificial grassland,which can be potentially popularized in similar areas.